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Sample search results for: a-site substituted perovskite

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1 Effect of Explicit Cationic Size and Valence Constraints on the Phase Stability of 1:2 B-Site-Ordered Perovskite
 

Summary:  + , and Y3+ , whereas pseudocubic perovskites result for M ) Cu2+ and Zn2+. For A-site substitutions... pentavalent ruthenium. To elucidate the effect of substitution on the strontium site (A-site), samples of Sr3... . The solubility range of Ca2+ on the A-site, as ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
2 Physics of the Earth and Planetary Interiors 155 (2006) 96103 Al, Fe substitution in the MgSiO3 perovskite structure
 

Summary:  -site fixed at zero. Consequently, all the Fe atoms occupy the A-site of the perovskite structure... of those given in Eqs. (1) and (3), with Fe substituting for Mg on the A-site and Al3+ for the Si4... calculations (Brodholt, 2000), which show that the substitution of Fe onto the ...

  

Source: Jacobsen, Steven D. - Department of Earth and Planetary Sciences, Northwestern University

 

Collection: Geosciences

 
3 E-mail address: achakhmo@gale.lakeheadu.ca The Canadian Mineralogist
 

Summary:  -994 (2000) OCCURRENCE, ALTERATION PATTERNS AND COMPOSITIONAL VARIATION OF PEROVSKITE IN KIMBERLITES ANTON R... , Ontario P7B 5E1, Canada ABSTRACT The present work summarizes a detailed investigation of perovskite from... modes of occurrence of perovskite in archetypal kimberlites are discrete crystals set in a serpentine

  

Source: Chakhmouradian, Anton - Department of Geological Sciences, University of Manitoba

 

Collection: Geosciences

 
4 American Mineralogist, Volume 88, pages 11611164, 2003 0003-004X/03/00071161$05.00 1161
 

Summary:  + in pure MgSiO3 perovskite at ambient conditions. As for the "C" peak, simulation of the A-site peak... -coordinated "A" sites ([8] Mg) (Knittle and Jeanloz 1987; Zhang and Weidner 1999). After FeO and possibly Fe2O3... + 1/2O2­ ´ Al3+ B + 1/2V0 O (2) O-atom vacancy substitutions are ...

  

Source: Nur, Amos - Department of Geophysics, Stanford University

 

Collection: Geosciences

 
5 Perovskites by Design: A Toolbox of Solid-State Raymond E. Schaak and Thomas E. Mallouk*
 

Summary:  combined to synthesize the new A-site defective cubic perovskite Ca0.67- Eu1.33La0.67Ti3O9. It should... better in the large interlayer A-site of a layered perovskite than in the smaller A-site of a three... charged, it remains in the original perovskite block, so ...

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
6 Electronic spin state of iron in lower mantle perovskite
 

Summary:  as- signed to Fe2 at the 8- to 12-coordinated pseudododecahedral site (A site). These are widely... sites). For example, when Fe2 , Fe3 (A site), and Fe3 (B site) are in the high-spin state (2H3H3h... 2 is in the high-spin state, Fe3 (A site) is in the ...

  

Source: Shen, Guoyin - High Pressure Collaborative Access Team (HPCAT), Carnegie Institution of Washington

 

Collection: Geosciences

 
7 Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases
 

Summary:  Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases Stephen... January 2006. [1] The athermal elastic constants of the perovskite and post-perovskite polymorphs of pure... percent FeSiO3 together with four mole percent Al2O3 into MgSiO3 reduces the ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
8 2 High temperature elastic anisotropy of the perovskite and post-3 perovskite polymorphs of Al2O3
 

Summary:  ., D. A. Yuen, and T. Ebisuzaki (2003), Substitution mechan- 341ism of Al ions in MgSiO3 perovskite... 2 High temperature elastic anisotropy of the perovskite and post- 3 perovskite polymorphs of Al2O3... to determine the high 10 temperature elastic and seismic properties of the 11 ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
9 Crystal structure and dielectric properties of complex perovskite (Sr, Ba, Ca)(Ni0.5W0.5)O3
 

Summary:  form 16 January 2004; accepted 24 January 2004 Abstract A-site cation substitution with Ba2 + and Ca2... and conducted a serial A-site cation substitution with Ba2 + or Ca2 + for the SNW. It is well known that in case... of many complex perovskites, the A-site Sr2 + ...

  

Source: Messing, Gary L. - Department of Materials Science and Engineering, Pennsylvania State University

 

Collection: Materials Science

 
10 Journal of Solid State Chemistry 148, 3}15 (1999) Article ID jssc.1999.8190, available online at http://www.idealibrary.com on
 

Summary:  structures. LaYCaBa2 Cu2 xTi3 xO14 exhibits a large-small rare earth ordering on the A/A sites, like its... O structure has been recently pub- lished (15). Ba> resides at the large A* site adjacent... for B-site cation substitutions in quadruple perovskites (2, ...

  

Source: Marks, Laurence D. - Department of Materials Science and Engineering, Northwestern University; Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Chemistry ; Materials Science

 
11 This article was downloaded by:[Rappe, A. M.] [Rappe, A. M.]
 

Summary:  ) and ionic displacement (D0 ) for A-site ions found in ferroelectric perovskites. Ionic size... ), ionic size (R) and ionic displacement (D0 ) for A-site ions found in FE perovskites. Ionic size... are A-site driven while such classic ferroelectric perovskites as ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
12 Journal of Catalysis 249 (2007) 349358 www.elsevier.com/locate/jcat
 

Summary:  in Ba (see Table 1). This is consis- tent with extrusion of the excess A-site cation, possibly as Ba... of Pd(0), and the need to incorporate additional A-site cations all likely contribute to the greater... Journal of Catalysis 249 (2007) 349­358 www.elsevier.com/locate/jcat A Pd-doped perovskite catalyst

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
13 Journal of Solid State Chemistry 155, 216}224 (2000) doi:10.1006/jssc.2000.8936, available online at http://www.idealibrary.com on
 

Summary:  in layered cuprates (14). The smaller rare earth cation prefers to occupy the 8-coordinate (A) site between... layer octahedra in the quintuple perovskites (14) where copper preferentially substitutes for titanium... PEROVSKITE-LAYERED CUPRATES 217 #12;FIG. 3. Schematic view of Sr ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
14 JOURNALDE PHYSIQUE IV ColIoqueC7,supplementau JournaldePhysique111, Volume 3, novembre1993
 

Summary:  deficiencies in A-cation and/or Sr-substitution degrees. 2. EXPERIMENTAL PROCEDURES. The perovskite powders... phase perovskites for small La-deficiency, i.e for y=0.95, irrespective of the Sr-substitution degree... is caused by the La deficieny itself and might be related to the existence of vacancies on ...

  

Source: Ecole Polytechnique, Centre de mathématiques

 

Collection: Mathematics

 
15 ORIGINAL PAPER A. R. Chakhmouradian K. Ross
 

Summary:  is accompanied by increasing volumes of the A-site polyhedra, whereas the volume of MgF6 octahedra initially... - tive of antiphase tilting (a) ) and in-phase tilting (c+ ) of MgF6 polyhedra, and A-site cation... -range order between the A-site ca- tions) or variation in structural distortion over the sample (e

  

Source: Chakhmouradian, Anton - Department of Geological Sciences, University of Manitoba

 

Collection: Geosciences

 
16 ELSEVIER PhysicaC282-287(1997)959-960 Genesis of Superconductivity in the Layered Cuprates: (ACuOzs)2(ATiO3) m; 2 <__m _ 4 *
 

Summary:  . This report will focus solely on the m = 2 mixed A-site stoichiometryLn'Ln"BazCuzTi20n (Ln' = Nd, Ln" = Dy... perovskite Ln'Ln"BazCuzTi20,,(Im'Ln" = NdDy), such as solid solution behavior, stable defect species... in the electronic and structural features which stabilize two dimensional (layered) perovskite-like systems. X

  

Source: Marks, Laurence D. - Department of Materials Science and Engineering, Northwestern University; Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Chemistry ; Materials Science

 
17 This paper is dedicated to Professor J. M. Honig, in thanks for his friendship, his scienti"c accomplishments, and his many years of service to
 

Summary:  dehydrate around 5003C to form A-site defective cubic perovskites. 2000 Acdemic Press INTRODUCTION... the A-site ordered nondefective perovskites AEu Ti O (A"Ca, Sr) (15). Novel A-site defective cubic... acids can be topochemically dehy- drated to form new A-site ...

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
18 A New Series of Layered Cuprates (ACuO2.5)2(ATiO3)m: Dy2Ba2Ca2Cu2Ti4O17, m ) 4
 

Summary:  + and tetravalent Ti4+ requires the large divalent ion (such as Ba2+) to fill the large A-site cavity between CuO5... of the Ba2+ ions into the A-sites between Cu2+O5 and Ti4+O6 polyhedra combine together to stabilize the two... a large number of layered perovskite- type cuprates with two-dimensional CuO2 planes. In this short

  

Source: Marks, Laurence D. - Department of Materials Science and Engineering, Northwestern University; Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Chemistry ; Materials Science

 
19 LJournal of Alloys and Compounds 311 (2000) 1621 www.elsevier.com/locate/jallcom
 

Summary:  ,11]. It has been reported linearly with increasing A-site disorder, as quantified by that the catalytic... activity of some materials prepared by the the variance in the distribution of A-site cation radii... of nanosized La CuO perovskite oxide using an amorphous2 4 heteronuclear complex as a precursor at low

  

Source: Gao, Song - College of Chemistry, Peking University

 

Collection: Chemistry ; Materials Science

 
20 Internal Chemistry of the Pure and Chemically Substituted Quadruple Perovskites LnLnBa2Cu2Ti2O11 (LnLn ) LaY
 

Summary:  Internal Chemistry of the Pure and Chemically Substituted Quadruple Perovskites LnLnBa2Cu2Ti2O11... systems, is directly related to the A-site order and is an important step toward achieving... Powder XRD results showed that the LnLn ) LaY compound adopted an ordered A-site arrangement

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry


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21 To whom correspondence should be addressed. Fax: 847-491-7820. E-mail: n-mansourian@nwu.edu.
 

Summary:  ed defect model for pure and chemically substituted quadruple and quintuple pure perovskite layered... data in a variety of pure and chemically substituted copper-based quadruple and quintuple perovskites... . The plots for the A-site doped and A- and B-site codoped quadruple samples in ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
22 Defect chemistry and transport properties of BaxCe0.85M0.15O3-
 

Summary:  fluorite phase. Although va- cancies are known to occur on the A-site of A2+ B4+ O3 perovskites (such... the fraction of Ba lost from the perovskite composition, and y/(1-y) represents the dopant occupancy on the A-site... is consistent with a perovskite phase of fixed stoichiometry, and ...

  

Source: Jet Propulsion Laboratory, Thermoelectrics Team

 

Collection: Energy Storage, Conversion and Utilization ; Materials Science

 
23 Chem. Mater. 1996, 7, 1355-1360 1355 Crystal Chemistry of Ln'Ln''Ba2Cu2Ti2011
 

Summary:  of the constituent lanthanides has been investigated. Powder X-ray data show that the mixed A-site compositions Ln... A-site stoichiometries Ln'Ln"Ba2Cu2- Ti2011(Ln =lanthanide, Y)are reported, which lead to preferred... -coordinateA site, and the smallest A cation (Ln3+)occupies both the 8-coordinate and ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
24 Al2O3 incorporation in MgSiO3 perovskite and ilmenite Wendy R. Panero a,, Sofia Akber-Knutson b
 

Summary:  -type substitution of Al in perovskite is expected to be negligible [16­20]; we consider only the Tschermak... value at 2000 K for perovskite with Tschermack substitutions. 2.3. Ilmenite solid solutions Based on our... of pressure for Al2O3 substitutions in the ...

  

Source: Stixrude, Lars - Department of Geological Sciences, University of Michigan

 

Collection: Geosciences

 
25 Physics of the Earth and Planetary Interiors 174 (2009) 247253 Contents lists available at ScienceDirect
 

Summary:  ) A­A site (i.e., nominally between the Mg sites) pair for the trivalent­monovalent substitution, we... Fe+3 or Al+3 cation (Fig. 2c). Al in pv reduces the A- site considerably, and there is a parallel... ., 2003. Cationic substitution in MgSiO3 ...

  

Source: Steinle-Neumann, Gerd - Bayerisches Geoinstitut, Universität Bayreuth

 

Collection: Geosciences

 
26 Catalysts and Fuel Mixing for Diesel Reformer in Fuel Cell Auxiliary Power Unit
 

Summary:  the A-site Oxygen B-site A-site Oxygen B-site Figure 1. Lattice structure of a single cell in perovskite... substitutions on the "A" and "B" sites. The perovskites were made by mixing nitrate solutions of the transition... reforming using the existing commercial injector components. ...

  

Source: Argonne National Laboratory, Chemical Sciences and Engineering Division, Fuel Cell Department

 

Collection: Energy Storage, Conversion and Utilization

 
27 Electronic spin transitions and the seismic properties of ferrous iron-bearing MgSiO3 post-perovskite
 

Summary:  ] The calculated enthalpies of the five post-perovskite models incorporating two ferrous iron substitutions... Electronic spin transitions and the seismic properties of ferrous iron- bearing MgSiO3 post-perovskite... ; revised 22 February 2006; accepted 1 March 2006; published 6 April 2006. [1] The elastic constants of ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
28 JOURNAL OF SOLID STATE CHEMISTRY 119, 80-89 (1995) High-Temperature Transport and Defect Studies of Quadruple
 

Summary:  the A-site (site lb) in the perovskite cell, while copper and titanium were distributed statistically... (lanthanum and barium on the A-site, and copper and titanium on the B-site). The most significant feature... of Quadruple Perovskites: La,Ba,Cu,Sn,O,, , Eu,Ba,Cu,Ti,O,, , and La,Ba,Cu,Ti,O,, P. A. ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
29 ELSEVIER PhysicaC 282-287(1997)837-838 A New Series of Layered Pure Perovskites (ACuOzs)2(ATiOs). *
 

Summary:  that in the quadruple perovskite (1.925A in Tb2Ca2Ba2Cu2Ti4017). Substituting Y for Ln is also an effective way... PHYSICA@ ELSEVIER PhysicaC 282-287(1997)837-838 A New Series of Layered Pure Perovskites (ACuOzs)2... of layered "pure" perovskites (ACuOz_0z(ATiOs)m(m = 2 - 4) was found. The distance between ...

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
30 Phase transition in MgSiO3 perovskite in the earth's lower mantle Taku Tsuchiya*, Jun Tsuchiya, Koichiro Umemoto, Renata M. Wentzcovitch
 

Summary:  [perovskite with coupled (Al3 + , Al3 + ) or (Al3 + , Fe3 + ) substitution for (Mg, Si)] should transform... at lower pressures, while iron-(II)-bearing perovskite (Fe2 + substitution for Mg2 + ) might transform... Phase transition in MgSiO3 perovskite in the earth's lower mantle Taku ...

  

Source: Voèadlo, Lidunka - Department Earth Sciences, University College London

 

Collection: Chemistry ; Geosciences

 
31 Perovskite Based Catalysts for Diesel Reforming in Solid Oxide Fuel Cell Application
 

Summary:  Perovskite Based Catalysts for Diesel Reforming in Solid Oxide Fuel Cell Application Di-Jia Liu... investigation of perovskite-based materials as a potential low-cost alternative for autothermal reforming (ATR... ). Transition- metal perovskites have the key attributes for a robust reforming catalyst. Since the metals

  

Source: Argonne National Laboratory, Chemical Sciences and Engineering Division, Fuel Cell Department

 

Collection: Energy Storage, Conversion and Utilization

 
32 10.1098/rsta.2002.1078 Computational mineral physics and the
 

Summary:  that for Al3+ -free perovskite. In contrast, per- ovskites where Al3+ substitutes for Si4+ only... Si Mg O Figure 3. The structure of perovskite with one Al3+ substituting for Si4+ and one for Mg2... compressible that MgSiO3 perovskite. Substituting Al3+ for Si4+ and ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
33 Vol. 34 (2003) ACTA PHYSICA POLONICA B No 2 CONTROL OF MOTT TRANSITION
 

Summary:  of the compositional change of the perovskite A-site (non-TMO site). Fig. 1. Metal#21;insulator phase diagram based... . The distortion of the bond angle M-O-M depends on the ionic radius of the A-site ion, namely a larger distortion... state should play an important role not only in real- izing the A-site ...

  

Source: Magiera, Andrzej - Instytut Fizyki, Uniwersytet Jagiellonski

 

Collection: Physics

 
34 Electronic spin transitions in iron-bearing MgSiO3 perovskite Stephen Stackhouse , John P. Brodholt, G. David Price
 

Summary:  in perovskite in the lower mantle, it is thought that both ferrous and ferric iron substitute into the pseudo... silicate perovskite via charge coupled substitution with alumi- num [19]. Here we broaden our investigation... atom magnesium silicate perovskite model was fabricated, but ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
35 Effect of Al on the sharpness of the MgSiO3 perovskite to post-perovskite phase transition
 

Summary:  enthalpy differences between post-perovskite and perovskite in various substitutions indicate that Al ! Si... -Perovskitea Substitution Al2O3, mol% V0 (A° 3 ) K0, GPa K0 Perovskite None 0 41.75 235 3.84 CCM 6.25 41.86 232 3.86 CCM 100... Effect of Al on the sharpness of the MgSiO3 ...

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,; Steinle-Neumann, Gerd - Bayerisches Geoinstitut, Universität Bayreuth

 

Collection: Geosciences

 
36 Ion-Exchangeable, Electronically Conducting Layered Perovskite Oxyfluorides
 

Summary:  inert atmosphere conditions to yield layer perovskites in which some of the oxygen is substituted... themselves. There are reports of manipulating the A-site cations by high-temperature solid-state reations... that does not depend on special redox properties of the A-site cations and may thus be applicable

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
37 Topochemical Synthesis of Three-Dimensional Perovskites from Lamellar Precursors
 

Summary:  A-site disordering occurs in the other perovskites. In all cases, the anisotropic texture... reaction allows them to move in the perovskite lattice. Similar disordering of A-site cations occurs... -type perovskites that are cation-disordered (or that contain only Eu and no other ...

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
38 Ab initio investigation of perovskite and post-perovskite CaPtO3 Samir F. Matar, Grard Demazeau, Alain Largeteau
 

Summary:  -25Sep2008 #12;Fig. 6. (color online) Post-perovskite PPV­MgSiO3: (a) site projected DOS and (b) Si... Ab initio investigation of perovskite and post-perovskite CaPtO3 Samir F. Matar, Gérard Demazeau... , Alain Largeteau Abstract For the recently synthesized ...

  

Source: Ecole Polytechnique, Centre de mathématiques

 

Collection: Mathematics

 
39 Preparation, Characterization, and Ferroelectric Properties of the Alkylamine-Intercalated Layered
 

Summary:  Perovskite-Type Oxides (CnH2n+1NH3-Sr2Nb3O10, n ) 1-6) Zhaohui Zhong, Weiping Ding, Wenhua Hou,* and Yi Chen... of alkylamine-intercalated layered perovskite-type oxides, CnH2n+1NH3-Sr2Nb3O10 (n ) 1-6), were prepared through... between the perovskite layers. Infrared spectra (IR) and Raman spectra of the samples revealed the ...

  

Source: Zhong, Zhaohui - Department of Electrical Engineering and Computer Science, University of Michigan

 

Collection: Materials Science ; Engineering

 
40 Sound velocities and elasticity of aluminous MgSiO3 perovskite: Implications for aluminum heterogeneity in Earth's lower mantle
 

Summary:  substitution in MgSiO3 perovskite: Investigation of multiple mechanisms by 27 Al NMR, Am. Mineral., 88, 1161... Sound velocities and elasticity of aluminous MgSiO3 perovskite: Implications for aluminum... a remarkably strong effect on the thermoelastic properties of MgSiO3 perovskite. However, the sound ...

  

Source: Jackson, Jennifer M. - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collection: Geosciences


Page:   1  2  3  4  5 
Page:   1  2  3  4  5 
 
41 First-principles investigation of the highly tetragonal ferroelectric material Bi(Zn12Ti12)O3 Tingting Qi, Ilya Grinberg, and Andrew M. Rappe
 

Summary:  with pre- vious results for the PZT solid solution,27 the A-site displace- ment directions vary more than... active Zn and Ti cations and the coupling of A-site and B-site distortions allows extremely large cation... electrostatics. Repulsion be- tween the A-site and B-site cations, both of a direct and of through-oxygen kind

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
42 GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/, The Effect of Al on the Sharpness of the MgSiO3
 

Summary:  to post-perovskite phase transition in MgSiO3. We examine three substitution mechanisms for Al in the two... into perovskite and post-perovskite struc- tures indicate that oxygen vacancy substitution is highly unfavorable... . Substitution Al2O3 mol% V0 (°A3 ) K0 ...

  

Source: Barr, Al - Computer Science Department, California Institute of Technology; California Institute of Technology, Center for Advanced Computing Research, Center for Simulation of Dynamic Response of Materials

 

Collection: Computer Technologies and Information Sciences ; Materials Science

 
43 High-pressure sound velocities and elasticity of aluminous MgSiO3 perovskite to 45 GPa: Implications for lateral heterogeneity in Earth's
 

Summary:  how the substitution of both iron and aluminum into MgSiO3 perovskite would affect the sound... ), Substitution mechanism of Al ions in MgSiO3 perovskite under high pressure conditions from first... High-pressure sound velocities and elasticity of aluminous MgSiO3 perovskite to 45 GPa

  

Source: Jackson, Jennifer M. - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collection: Geosciences

 
44 Accelerated Modeling and New Ferroelectric Materials for Naval SONAR Ilya Grinberg, Valentino R. Cooper,
 

Summary:  have shown that Ag cations can be ferroelectrically active on the perovskite A- site. Alloying AgNbO3... is disfavored by large octahedral rotations[28,29] . Elimination of Pb atoms from the A-site makes a material... .0° in 50/50 PZT[22] ). Finally, the presence of the Pb atoms on the ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
45 American Mineralogist, Volume 90, pages 199205, 2005 0003-004X/05/0001199$05.00/DOI:10.2138/am.2005.1633 199
 

Summary:  .2005.1633 199 INTRODUCTION Iron-bearing magnesium silicate perovskite, coexisting with small amounts... of (Mg,Fe)O ferropericlase and CaSiO3 perovskite, is thought to be the most abundant phase in Earths... perovskite, because it can affect electrostatic charge balance and equilibrium defect concentra- tions

  

Source: Jackson, Jennifer M. - Division of Geological and Planetary Sciences, California Institute of Technology; Shen, Guoyin - High Pressure Collaborative Access Team (HPCAT), Carnegie Institution of Washington

 

Collection: Geosciences

 
46 Communication www.rsc.org/chemcomm
 

Summary:  ) temperatures from layered perovskite precursors. Similarly, A-site defective three-dimen- sional perovskites... of interlayer Na+ cations than are needed to fill the A-sites of a perovskite block, so divalent ion exchange... . Subsequent reduction can collapse the ...

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
47 Eur. J. Mineral. 2007, 19, 533546
 

Summary:  (in agreement with Dowty's model). Among isovalent A-site cations, the larger partition into the {100... ). This habit results from {111} being the domi- Fig. 6. Morphology and A-site bonding topology of growing... } face. A-site cations attached to the surface are indicated by purple spheres; their bonding configu

  

Source: Chakhmouradian, Anton - Department of Geological Sciences, University of Manitoba

 

Collection: Geosciences

 
48 Optical properties of deep-earth minerals 1 Optical properties of deep-earth minerals
 

Summary:  -linked SiO6 octahedra (B site). Magne- sium and ferrous iron (Fe2+ ) occupy the dodecahe- dra (A site... 's mass and is thought to consist of about 80% silicate perovskite [(Mg,Fe)SiO3] and 20% fer- ropericlase... exhibits an orthorhombic deviation from the ideal cubic-perovskite symmetry due to tilting of ...

  

Source: Jacobsen, Steven D. - Department of Earth and Planetary Sciences, Northwestern University

 

Collection: Geosciences

 
49 Mechanisms of Al3+ incorporation in MgSiO3 post-perovskite at
 

Summary:  the preferred [Fe3+ ­Al3+ ] substitution in the MgSiO3 perovskite phase (Pv) [21­23] and allows one to separate... ) the compressibility Fig. 6. Al­Al coupled substitution enthalpy difference between perovskite and post-perovskite... ­622. [29] T. Yamamoto, D.A. Yuen, T. Ebisuzaki, ...

  

Source: Oganov, Artem R. - Departments of Geosciences & Physics and Astronomy, SUNY at Stony Brook

 

Collection: Materials Science ; Physics

 
50 Effect of excess Bi2O3 on the ferroelectric properties of SrBi2Ta2O9 Jung-Kun Lee, Byungwoo Park, Kug-Sun Honga)
 

Summary:  be largely attributed to the displacement of the A-site cation in the per- ovskite blocks... of the A-site ion and Bi ions in the two types of cation sites with the aid of neutron diffraction... the excess Bi ions mainly substituted on the A site of the perovskite slabs. This is an unusual phenomenon

  

Source: Park, Byungwoo - School of Materials Science and Engineering, Seoul National University

 

Collection: Materials Science ; Physics

 
51 CRYSTAL CHEMISTRY OF PEROVSKITE-LIKE LAYER-TYPE FERROELECTRICS
 

Summary:  CRYSTAL CHEMISTRY OF PEROVSKITE-LIKE LAYER-TYPE FERROELECTRICS I. H. ISMAILZADE The Institute... . S. R. Rbum6. -Le nombre m de couches monooctatdriquesdans lesempilementsdu type perovskite depend... presente note. Abstract. -The number of monooctahedral layers in the perovskite-likepackage m depends

  

Source: Ecole Polytechnique, Centre de mathématiques

 

Collection: Mathematics

 
52 Electronic spin state of ferric iron in Al-bearing perovskite in the lower John P. Brodholt,1
 

Summary:  , and T. Ebisuzaki (2003), Substitution mecha- nism of Al ions in MgSiO3 perovskite under high pressure... Electronic spin state of ferric iron in Al-bearing perovskite in the lower mantle Li Li,1,2 John P... the effect of pressure on the electronic spin state of ferric iron on Al-bearing MgSiO3-perovskite ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
53 PHYSICAL REVIEW B 83, 144112 (2011) Pb-free ferroelectrics investigated with density functional theory: SnAl1/2Nb1/2O3 perovskites
 

Summary:  to investigate the replacement of the Pb atom on the perovskite A-site, motivated by the desire to replace... solutions of (Ba1-xSnx)TiO3 can be cleanly obtained up to x = 0.2 (Refs. 10 and 11). A-site substitution... even for <10% substitution of Sn (Ref. 12). ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
54 Correlations between tetragonality, polarization, and ionic displacement in PbTiO3-derived ferroelectric perovskite solid solutions
 

Summary:  . For example, PA is more affected by A-site substi- tution while PB is more affected by the B-site substitution... data P2 , average A-site off- center displacement squared DA 2 and average B-site off- center... on A-site displacement, and that the correlation between c/a-1 and DA 2 comes from the coupling ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
55 VOLUME 81, NUMBER 6 P H Y S I C A L R E V I E W L E T T E R S 10 AUGUST 1998 Electrostatic Model of Atomic Ordering in Complex Perovskite Alloys
 

Summary:  insulators or to simultaneous A- site and B-site disorder, with possible incorporation of spin contributions... of Atomic Ordering in Complex Perovskite Alloys L. Bellaiche and David Vanderbilt Department of Physics... observed in a large class of complex insulating perovskite alloys. The model assumes that ...

  

Source: Vanderbilt, David - Department of Physics and Astronomy, Rutgers University

 

Collection: Physics ; Materials Science

 
56 Available online at www.sciencedirect.com Physics of the Earth and Planetary Interiors 170 (2008) 248259
 

Summary:  including ferropericlase, silicate perovskite, and possibly in post-perovskite at lower-mantle pressures... crossover in silicate perovskite at high pressures, but which valence state of iron undergoes the spin... ; Ferropericlase; Silicate perovskite 1. Introduction Earth

  

Source: Lin, Jung-Fu "Afu" - Department of Geological Sciences, University of Texas at Austin

 

Collection: Geosciences ; Materials Science

 
57 Site and Oxidation-State Specificity Yielding Dimensional Control in Perovskite Ruthenates
 

Summary:  Ruddlesden-Popper structure, wherein the Ca2+ and Sr2+ occupy the nine-coordinate A-sites between isolated Ru... Site and Oxidation-State Specificity Yielding Dimensional Control in Perovskite Ruthenates Job T... perovskite, Sr3CaRu2O9. Ruthenium's unusual ability to readily adopt both IV(d4) and V(d3) oxidation states

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry

 
58 Elasticity of (Mg, Fe)(Si, Al)O3-perovskite at high pressure Li Li a,b,*, John P. Brodholt a
 

Summary:  mechanism in MgSiO3 perovskite in recent years [14,21,25­27] agree that the charge coupled substitution... perovskite containing 6.25 mol% of ferric iron (substituting for Mg) and 6.25 mol% of Al3+ (substituting... ) with the specific sites for the substitution ...

  

Source: Price, G. David - Department Earth Sciences, University College London

 

Collection: Materials Science ; Geosciences

 
59 Thermodynamics of mixing in MgSiO3Al2O3 perovskite and ilmenite from ab initio calculations
 

Summary:  . Aluminum substitution in MgSiO3 perovskite: investigation of multiple mechanisms by Al-27 NMR. Am... Thermodynamics of mixing in MgSiO3­Al2O3 perovskite and ilmenite from ab initio calculations D... SiO3­Al2O3 solid solutions in perovskite and ilmenite structures were modeled based on the results

  

Source: Oganov, Artem R. - Departments of Geosciences & Physics and Astronomy, SUNY at Stony Brook

 

Collection: Materials Science ; Physics

 
60 High Pressure Transformation of La4Cu3MoO12 to a Layered Perovskite
 

Summary:  High Pressure Transformation of La4Cu3MoO12 to a Layered Perovskite Douglas A. Vander Griend... it stabilizes the perovskite structure. In this paper, we describe the HP synthesis of a new copper-rich layered... perovskite, La4Cu3MoO12, which is isotypic with La2- CuSnO6.1 When synthesized at ambient pressure (AP

  

Source: Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Materials Science ; Chemistry


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61 University of Florida | Journal of Undergraduate Research | Volume 12, Issue 1 | Fall 2010 Phase Purity and Site Selection with Lanthanum Doping in Sodium
 

Summary:  , "Investigation of the structure and phase transitions in the novel A-site substituted distorted perovskite... by the reaction ¼Bi2O3 + ¼Na2CO3+ TiO2 Na0.5Bi0.5TiO3 + ¼CO2 (1) NBT has a perovskite structure [7], as shown... of an element to the perovskite structure, is often used to ...

  

Source: Fang, Yuguang "Michael" - Department of Electrical and Computer Engineering, University of Florida

 

Collection: Engineering ; Computer Technologies and Information Sciences

 
62 Multiferroics are materials that display spontaneous ferroelectric and magnetic ordering at the same time. Magnetoelectrics are materials in which an electric polarization can be induced by an
 

Summary:  of the A-site spins might stabilize the Mn-spiral in the bc plane, giving rise to spontaneous polarization... investigated both the effect of substituting the R3+ cation by divalent Ca2+, and the effect of mixing a non... on the perovskite B-site plays a significant role in causing the ferroelec- tricity to disappear with ...

  

Source: Groningen, Rijksuniversiteit - Centre for Ecological and Evolutionary Studies, Department of Marine Benthic Ecology and Evolution,

 

Collection: Biology and Medicine ; Environmental Sciences and Ecology

 
63 Subscriber access provided by University Libraries | University of Notre Dame Industrial & Engineering Chemistry Research is published by the American
 

Summary:  at the A-site not only defines perovskite Figure 3. Polarization curves of methanol oxidation by different... combustion synthesis technique, a variety of complex, i.e., perovskites/ platinum (ABO3/Pt), catalysts were... perovskites (ABO3), which have an excellent proton transport property, as basic elements ...

  

Source: Mukasyan, Alexander - Department of Chemical and Biomolecular Engineering, University of Notre Dame

 

Collection: Materials Science

 
64 Crystal Growth and Magnetic Properties of Lanthanide-Containing Osmium Double Perovskites, Ln2NaOsO6 (Ln ) La, Pr, Nd)
 

Summary:  earth cation. Only a limited number of double perovskites with rare earth cations on the A-site have... Crystal Growth and Magnetic Properties of Lanthanide-Containing Osmium Double Perovskites, Ln2Na... , Columbia, South Carolina 29208 Received September 28, 2004 A series of double perovskite oxides, ...

  

Source: Prozorov, Ruslan - Ames Laboratory & Department of Physics and Astronomy, Iowa State University

 

Collection: Physics

 
65 Doping effect in layer structured SrBi2Nb2O9 ferroelectrics Yun Wu, Mike J. Forbess, Seana Seraji, Steven J. Limmer, Tammy P. Chou, Carolyn
 

Summary:  . Further studies on the A-site substitution by ions with various sizes and amounts in the SBN ferroelectric... , ionic polarizability, etc.44 In iso- tropic perovskite ferroelectrics, doping with bigger A-site ions... SBN , ferroelectrics. Substitution in both the A site Sr2 by Ca2 and ...

  

Source: Cao, Guozhong - Materials Science and Engineering Department, University of Washington at Seattle

 

Collection: Materials Science

 
66 Communications Close Relations between Doping and
 

Summary:  Communications Close Relations between Doping and Layering in Pure Perovskite Kenji D. Otzschi... enhance directional properties. Specif- ically, perovskite (ABO3)-related compounds have played... an important role because of their versatile layering schemes and tolerance to cation substitution. Consider

  

Source: Marks, Laurence D. - Department of Materials Science and Engineering, Northwestern University; Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Chemistry ; Materials Science

 
67 General introduction 1.1 Multiferroic materials
 

Summary:  . In manganites, the magnetic ground state as a function of the size of the A-site cation shows a rich be- haviour... that gives rise to different magnetic structures. Changing the size of the A-site cation by choosing... . Initially, partial substitution of ferroelectrics with paramagnetic cations was pro- posed [9]. In this case

  

Source: Groningen, Rijksuniversiteit - Centre for Ecological and Evolutionary Studies, Department of Marine Benthic Ecology and Evolution,

 

Collection: Biology and Medicine ; Environmental Sciences and Ecology

 
68 PHYSICAL REVIEW B 83, 134116 (2011) Theory of prospective perovskite ferroelectrics with double rocksalt order
 

Summary:  instead.17­19 A recent survey19 states that long-range A-site rocksalt ordering is known only for two... BaTiZrO6. In all three cases, the ferroelectricity is found to be A-site driven, with very little... involvement of B cations. More specifically, it is associated with a displacement of the smaller of the the A-site

  

Source: Vanderbilt, David - Department of Physics and Astronomy, Rutgers University

 

Collection: Physics ; Materials Science

 
69 1. Understanding crystal structures: How are more complex crystal structures built up from simpler ones.
 

Summary:  (perhaps better) hosts ? Pd2+-- substituted oxide catalysts #12;Perovskite BaCeO3 as a host: Ba2+ creates... optimized structure of 2x2x2 perovskite cell with one Pd2+ substituting Ce4+ and one oxygen vacancy: x = 12... + in the perovskite Lattice Also works for Suzuki coupling. Pd2+-- ...

  

Source: Akhmedov, Azer - Department of Mathematics, University of California at Santa Barbara

 

Collection: Mathematics

 
70 Charge-transfer electrostatic model of compositional order in perovskite alloys Zhigang Wu and Henry Krakauer
 

Summary:  by an environment-dependent effective A-site charge. Monte Carlo simulations of this model successfully reproduce... shows 111 1:1 B-site ordering at all measured temperatures, and 001 1:1 A-site ordering occurs below 950... -PZ described above. The BV model has also not been extended to study the effects of A-site chemical

  

Source: Wu, Zhigang - Department of Physics, Colorado School of Mines

 

Collection: Geosciences

 
71 Si-compatible candidates for high-dielectrics with the Pbnm perovskite structure Sinisa Coh,1,* Tassilo Heeg,2 J. H. Haeni,3 M. D. Biegalski,4 J. Lettieri,3, L. F. Edge,3 K. E. O'Brien,3 M. Bernhagen,5
 

Summary:  . It is well known that perovskites having sufficiently small A-site ions i.e., a small Goldschmidt tolerance... -atom primitive cell of a Pbnm-distorted ABO3 perovskite. A-site atoms are shown in black, B-site atoms... -factor analy- sis: perovskites with smaller ...

  

Source: Vanderbilt, David - Department of Physics and Astronomy, Rutgers University

 

Collection: Physics ; Materials Science

 
72 Annu. Rev. Mater. Res. 2003. 33:33359 doi: 10.1146/annurev.matsci.33.022802.091825
 

Summary:  -chemical concept is not clear, because data only for perovskites with Sr and Ba (i.e., A-site elements with similar... dopant R. In the case of perovskite- type oxides, substitution of up to 25% of the B-site cation... then be simply the consequence of a slight incorporation of the dopant on the ...

  

Source: Haile, Sossina M. - Departments of Chemical Engineering &amp; Materials Science, California Institute of Technology

 

Collection: Energy Storage, Conversion and Utilization

 
73 Journal of the Korean Physical Society, Vol. 49, December 2006, pp. S671S674 Photophysical Properties and Electronic Structure of Highly
 

Summary:  , the product is Sr2Nb2O7. This struc- tural substitution gives highly donor-doped (110) layered perovskite... Properties and Electronic Structure of Highly Donor Doped (110) Layered Perovskite Material E. D. Jeong, M. G... ) layered perovskite material was synthesized by solid state reac- tion method and ...

  

Source: Pak, Hyuk Kyu - Department of Physics, Pusan National University

 

Collection: Physics

 
74 Synthesis and Structure of LaSr2CuTiO6.5: A New Oxygen-Deficient Ruddlesden-Popper Phase
 

Summary:  in related materials, there is yet potential to induce ordering by chemical substitutions on the A-site... . A-site cations, such as lanthanum and strontium, which allow for such disorder on the oxygen... .1), is consistent with divalent copper with the oxygen vacancies distributed within the perovskite layers

  

Source: Marks, Laurence D. - Department of Materials Science and Engineering, Northwestern University; Poeppelmeier, Kenneth R. - Department of Chemistry, Northwestern University

 

Collection: Chemistry ; Materials Science

 
75 First-principles study of high-pressure alumina polymorphs Wenhui Duan, Renata M. Wentzcovitch, and Kendall T. Thomson
 

Summary:  : corundum, Rh2O3 II , Pbnm perovskite, R3¯c-perovskite, A-type rare-earth sesquioxide, and B-type rare... aluminum sites are investigated in detail for corundum, Rh2O3 II and the perovskite phases, which... - morphs, predicting corundum Rh2O3(II)(Pbnm) orthorhombic-perovskite phase transformations.14 The pre

  

Source: Thomson, Kendall T.- Department of Chemical Engineering, Purdue University

 

Collection: Materials Science

 
76 American Mineralogist, Volume 86, pages 10761080, 2001 0003-004X/01/00091076$05.00 1076
 

Summary:  -pressure perovskite with a planar (two-dimensional) ordering of A-site cations. Most pre- viously described high... 1991). The high-pressure K-Th perovskite contains 44­46 wt% ThO2, depending on the number of A-site... + cations preferentially enter the 1a site, ...

  

Source: Chakhmouradian, Anton - Department of Geological Sciences, University of Manitoba

 

Collection: Geosciences

 
77 E-mail address: rmitchel@gale.lakeheadu.ca The Canadian Mineralogist
 

Summary:  coordinated by atoms of oxygen. Larger A-site cations are surrounded by twelve atoms of oxygen in cubo... ) in Nb-rich titanates such as the mineral latrappite (Mitchell et al. 1998). The A-site cations occupy... ) deviate significantly from the ideal Sr­O bond length in cubic SrTiO3 (2.761 Å). In contrast, A-site

  

Source: Chakhmouradian, Anton - Department of Geological Sciences, University of Manitoba

 

Collection: Geosciences

 
78 Modeling lower mantle anisotropy development in a subducting slab H.-R. Wenk a,, S. Speziale a
 

Summary:  ­mantle boundary (2891 km). Two phases are considered: orthorhombic MgSiO3-perovskite and cubic magnesiowuestite... is accommodated by slip. A polycrystal plasticity model predicts strong texture development for perovskite... : lower mantle; anisotropy; texture; elasticity; perovskite; magnesiowuestite 1. Introduction In many

  

Source: Garnero, Ed - Department of Geological Sciences, Arizona State University

 

Collection: Geosciences

 
79 .IPHYS IV FRANCE 7 (1997) ColloqueC2, Supplkmentau Journal de Physique I11 d'avril 1997
 

Summary:  theperovskitephase. 1.INTRODUCTION Lead titanate PbTi03 (PT)is a perovskite type ferroelectricmaterial... applications. To obtain the expected properties, the development of a pure perovskite phase is required... the crystalline phases. Sol-gel derived PT powders often crystallise directly into the perovskite structure [l

  

Source: Ecole Polytechnique, Centre de mathématiques

 

Collection: Mathematics

 
80 PII S0016-7037(01)00854-7 Efremovka 101.1: A CAI with ultrarefractory REE patterns and enormous enrichments of
 

Summary:  substitutional relationship in perovskites from Efremovka 101.1. 1472 A. El Goresy et al. #12;0.14 to 0.35 wt... enrichments of Sc, Zr, and Y in Fassaite and Perovskite A. EL GORESY,1,2, * E. ZINNER,3 S. MATSUNAMI,4 H... abundant Y- and Zr-perovskite, Sc- and Zr-rich fassaite, and metallic FeNi enclosed in ...

  

Source: Washington University in St. Louis, Department of Physics, Laboratory for Space Sciences

 

Collection: Physics


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81 BaCe1-xPdxO3-(0 e x e 0.1): Redox Controlled Ingress and Egress of Palladium in a Perovskite
 

Summary:  -ray photoelectron spectroscopy that Pd2+ ions can be substituted for Ce in perovskite BaCeO3 and that, under... for three-dimen- sional octahedral tilting that is seen in experiment. For the Pd-substituted perovskite... . Figure 2. Evolution of the unit cell volume of perovskite ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
82 Relating Fundamental Chemistry and Smart Materials with DFT Calculations Yashar Yourdshahyan, Ilya Grinberg, Na Sai,
 

Summary:  is due to the off- centering behavior exhibited by Pb atoms on the perovskite A-site as well... -centering behavior. However, of the cations known to occupy the perovskite A- site at ambient pressure... of ferroelectric solid solutions containing Ag atoms on the ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
83 Atomistic Study of Doped BaCeO3: Dopant Site-Selectivity and Cation Nonstoichiometry
 

Summary:  -deficient composition, it is apparent that the degree of dopant incorporation onto the A-site determines the sign... , A-site vacancies (with negative charge) can be anticipated as the primary charge compensating defect... .4 eV) was found to be relatively high. This last result is consistent with the observation of A-site

  

Source: Jet Propulsion Laboratory, Thermoelectrics Team

 

Collection: Energy Storage, Conversion and Utilization ; Materials Science

 
84 A U.S. Department of Energy Office of Science Laboratory
 

Summary:  calcination temperature. A-site Oxygen B-site (Ru) A-site Oxygen B-site (Ru) Lattice Structure of a Single... Science and Technology Office of Science U.S. Department of Energy Approach: Development of Perovskite... Based Catalyst · The Perovskite Catalyst... - Low cost material. - Stable under high ...

  

Source: Argonne National Laboratory, Chemical Sciences and Engineering Division, Fuel Cell Department

 

Collection: Energy Storage, Conversion and Utilization

 
85 Processing and Properties of Strontium Bismuth Vanadate Niobate Ferroelectric Ceramics
 

Summary:  literature to enhance the properties of layered perovskite ferroelectrics by the addition or substitution... reports on the substitution of A site ions, Sr2 , in the perovskite unit cells, by Bi3 or Ba2 .10... . This observation is different from what is commonly found in isotropic ...

  

Source: Cao, Guozhong - Materials Science and Engineering Department, University of Washington at Seattle

 

Collection: Materials Science

 
86 Predicting morphotropic phase boundary locations and transition temperatures in Pb-and Bi-based perovskite solid solutions
 

Summary:  ; this leads to an indirect oxygen-mediated Pb­Ti repulsion.22 Similar coupling be- tween A-site lone pair... -based perovskite solid solutions from crystal chemical data and first-principles calculations Ilya Grinberga... and transition temperature at MPB in ferroelectric perovskite solutions can be predicted with quantitative

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
87 Suppression of strain coupling in perovskite La0.6Sr0.1TiO3 by cation disorder Christopher J. Howard and Zhaoming Zhang
 

Summary:  of the perovskite structure. The work reported here follows our previous structural studies11­13 of A-site... in the same space groups, apart from reduced A-site occupancy. Internal coor- dinates were refined along... Suppression of strain coupling in perovskite La0.6Sr0.1TiO3 by cation disorder Christopher ...

  

Source: Cambridge, University of - Department of Earth Sciences

 

Collection: Geosciences

 
88 VOLUME 84, NUMBER 24 P H Y S I C A L R E V I E W L E T T E R S 12 JUNE 2000 Compositional Inversion Symmetry Breaking in Ferroelectric Perovskites
 

Summary:  of tem- perature, and the properties of materials with simultane- ous A-site and B-site substitution... -by-layer along the ferroelectric direction as illustrated in Figs. 1(a) and 1(b) for A-site and B-site modulation... a series of model systems that allow us to test for the effects of A-site vs B-site and ...

  

Source: Vanderbilt, David - Department of Physics and Astronomy, Rutgers University

 

Collection: Physics ; Materials Science

 
89 Nonmonotonic Composition Dependence of the Dielectric Response of Ba1-xCaxZrO3
 

Summary:  has been substituted into a larger A-site perovskite for a range of compositions. Acknowledgment... on the particular chemistry of Ba, Ca, and Zr ions but are due to a size mismatch on the perovskite A-site between... are relevant whenever doping a large cation ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
90 Cation non-stoichiometry in yttrium-doped barium zirconate: phase behavior, microstructure, and proton conductivity
 

Summary:  have investigated A-site non- stoichiometry in Ba1ÀxZr0.8Y0.2O3Àd, a candidate electrolyte material... -stoichiometry by incorporation of yttrium on the A-site. The dopant partitioning can explain the decrease in cell constant... , as captured in the phase diagram, Fig. 5. This behavior indicates that A-site vacancies are ...

  

Source: Jet Propulsion Laboratory, Thermoelectrics Team

 

Collection: Energy Storage, Conversion and Utilization ; Materials Science

 
91 Philosophical Magazine, Vol. 86, No. 16, 1 June 2006, 23292342
 

Summary:  translation; (010) is such a boundary plane. It is well accepted that the size of the A-site cation influences... microscopy data. 1. Introduction Perovskite compounds have attracted a significant research interest due... to the displace phase transition from the basic perovskite structure to a more complicated ...

  

Source: Wang, Zhong L. - School of Materials Science and Engineering, Georgia Institute of Technology

 

Collection: Materials Science

 
92 Introduction This chapter briefly introduces the fundamentals of ferroelectric materials and their
 

Summary:  uses the stereo-chemical activity of the A-site ions to couple the magnetism and ferroelectricity... the centrosymmetric position with respect to the coordinated oxygen ions. Then, the A-site Bi or Pb ion is responsible... piezoelectricity and Curie temperature can be tuned by substituting different cations. In ...

  

Source: Groningen, Rijksuniversiteit - Centre for Ecological and Evolutionary Studies, Department of Marine Benthic Ecology and Evolution,

 

Collection: Biology and Medicine ; Environmental Sciences and Ecology

 
93 Studies of Perovskite Materials for High-Performance Storage Media, Piezoelectric, and Solar Energy Conversion Devices
 

Summary:  and structure. 2.2 The Effect of Substituting of S for O: The Sulfide Perovskite BaZrS3 The impact... of the chemical changes on the anion site in perovskites (e.g., substitution of S for O) has been largely... for simple metal cations with no stereochemically-active lone pairs, a large increase in the ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
94 Bi:SrTiO3: A quantum ferroelectric and a relaxor Chen Ang,* Zhi Yu, P. M. Vilarinho, and J. L. Baptista
 

Summary:  probably are due to the heterovalent substitution and A-site vacancies in SBT. The reasons should... of the A-site vacancies and heterovalent substitution on the ferro- electric relaxor behavior. Besides... be further studied. Another character of SBT is the existence of Sr-site va- cancies in SBT.16,18 ...

  

Source: Luettmer-Strathmann, Jutta - Department of Physics, University of Akron

 

Collection: Physics

 
95 Silver solid solution piezoelectrics Ilya Grinberga)
 

Summary:  the feasibility of using silver on the perovskite A-site in high-performance lead-free piezoelectrics... . Off-centering of the Pb atoms on the perovskite A-site has been shown to be crucial to the high... on the A-site, similar to the short covalent bonds found in many Pb-based ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
96 A "Chimie Douce" Sythesis of Perovskite-Type SrTa2O6 and
 

Summary:  + into the perovskite A-sites formed in the reaction. The observed powder pattern was accurately simulated as a three... A "Chimie Douce" Sythesis of Perovskite-Type SrTa2O6 and SrTa2-xNbxO6 1 Patricia J. Ollivier... reaction that converts a layered perovskite phase into a metastable three-dimensional ...

  

Source: Mallouk, Thomas E.- Department of Chemistry, Pennsylvania State University

 

Collection: Materials Science ; Chemistry

 
97 Dense inorganic membranes Studies on transport properties, defect chemistry
 

Summary:  side. Analysis of this surface shows that the perovskite structure remains intact upon extended... in the presence of CO. Oxygen vacancies at the perovskite interface play a role in both models. Steady state... vacancy. Chapters 5-7 report on cobalt-containing perovskites La0.6Sr0.4Co1-yFeyO3-. These compounds

  

Source: Verweij, Henk - Department of Materials Science and Engineering, Ohio State University

 

Collection: Materials Science

 
98 Effect of substituting of S for O: The sulfide perovskite BaZrS3 investigated with density functional theory
 

Summary:  Effect of substituting of S for O: The sulfide perovskite BaZrS3 investigated with density... in electroceramic capacitors. Also of interest are solid solutions which contain either more than one type of A-site... of the anions S and O is 1.3. Such an increase in the A-site volume relative to the size of the ...

  

Source: Rappe, Andrew M. - Departments of Chemistry & Materials Science and Engineering, University of Pennsylvania

 

Collection: Materials Science ; Chemistry

 
99 LJournal of Alloys and Compounds 315 (2001) 5158 www.elsevier.com/locate/jallcom
 

Summary:  equations for addressing the high pressure melting of metastable silicate perovskites a , b b a *Zhongwu... ) stable at ambient3 2 3 12 condition, both CaSiO and MgSiO perovskites have been used to calculate... ­58 indicate that both CaSiO and MgSiO perovskites are relation of K 5 1/b , it is valid to allow to exchange K

  

Source: Utrecht, Universiteit - Faculty of Geosciences, Department of Theoretical Geophysics

 

Collection: Geosciences

 
100 Hyperfine Interact DOI 10.1007/s10751-011-0420-7
 

Summary:  perovskite and ferropericlase are thought to be the primary con- stituents of the lower mantle, whereas... silicate post-perovskite is more likely found in the lowermost mantle. Because these minerals contain... show that Fe2+ predominantly exhibits extremely high quadrupole splittings in perovskite and ...

  

Source: Lin, Jung-Fu "Afu" - Department of Geological Sciences, University of Texas at Austin

 

Collection: Geosciences ; Materials Science


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