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Title: CeAlO{sub 3} and Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd) solid solutions: Crystal structure, thermal expansion and phase transitions

Abstract

The crystal structures of CeAlO{sub 3} and the solid solutions Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd), and their thermal behaviour in a wide temperature range of 12-1200 K have been precisely determined by means of in situ high-resolution X-ray powder diffraction technique applying synchrotron radiation, thermal analysis and magnetic measurements. The unique sequence of the reversible phase transitions I4/mcm{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm has been detected in CeAlO{sub 3} and solid solutions formed in the pseudo-binary system CeAlO{sub 3}-LaAlO{sub 3}. In the Ce{sub 1-} {sub x} Nd {sub x} AlO{sub 3} system, the samples with x=0.3 and 0.5 compositions undergo three phase transformations I2/m{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm, whereas for the Ce-rich sample Ce{sub 0.9}Nd{sub 0.1}AlO{sub 3} four successive transitions are observed: I4/mcm{r_reversible}I2/m{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm. = Crystal structure parameters of all structural polymorphs of CeAlO{sub 3} and solid solutions based on them as well as their thermal evolution are reported. Based on in situ powder diffraction and DTA/DSC data, the phase diagrams of the pseudo-binary systems CeAlO{sub 3}-LaAlO{sub 3} and CeAlO{sub 3}-NdAlO{sub 3} are constructed together with a combined phase diagram, where the transition temperatures are presented as a function of the average radius of rare-earth cations. - Graphical abstract: Combined phase diagram of the CeAlO{sub 3}-LaAlO{submore » 3} and CeAlO{sub 3}-NdAlO{sub 3} systems, where the transition temperatures are presented as a function of the average radius of rare-earth cations. The letters indicate L iquid, C ubic, R hombohedral, O rthorhombic, M onoclinic and T etragonal phase fields.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [3];  [5];  [4];  [6]
  1. Institute of Telecommunications, Radioelectronics and Electronics Technique, Semiconductor Electronics Department, Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv (Ukraine), E-mail: crystal-lov@polynet.lviv.ua
  2. Institute of Telecommunications, Radioelectronics and Electronics Technique, Semiconductor Electronics Department, Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv (Ukraine)
  3. (Germany)
  4. Materialwissenschaft, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt (Germany)
  5. Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany)
  6. (Spain)
Publication Date:
OSTI Identifier:
21015775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2007.01.020; PII: S0022-4596(07)00039-4; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINATES; CALORIMETRY; CERIUM COMPOUNDS; CRYSTAL-PHASE TRANSFORMATIONS; DIFFERENTIAL THERMAL ANALYSIS; LANTHANUM COMPOUNDS; NEODYMIUM COMPOUNDS; PHASE DIAGRAMS; SOLID SOLUTIONS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; THERMAL EXPANSION; TRANSITION TEMPERATURE; X-RAY DIFFRACTION

Citation Formats

Vasylechko, L., Senyshyn, A., Materialwissenschaft, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Trots, D., Niewa, R., Department Chemie, Technische Universitaet Muenchen, Lichtenbergstrasse 4, 85747 Garching, Schnelle, W., Knapp, M., and CELLS, POB 68, 08193, Barcelona. CeAlO{sub 3} and Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd) solid solutions: Crystal structure, thermal expansion and phase transitions. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.01.020.
Vasylechko, L., Senyshyn, A., Materialwissenschaft, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Trots, D., Niewa, R., Department Chemie, Technische Universitaet Muenchen, Lichtenbergstrasse 4, 85747 Garching, Schnelle, W., Knapp, M., & CELLS, POB 68, 08193, Barcelona. CeAlO{sub 3} and Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd) solid solutions: Crystal structure, thermal expansion and phase transitions. United States. doi:10.1016/j.jssc.2007.01.020.
Vasylechko, L., Senyshyn, A., Materialwissenschaft, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Trots, D., Niewa, R., Department Chemie, Technische Universitaet Muenchen, Lichtenbergstrasse 4, 85747 Garching, Schnelle, W., Knapp, M., and CELLS, POB 68, 08193, Barcelona. Sun . "CeAlO{sub 3} and Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd) solid solutions: Crystal structure, thermal expansion and phase transitions". United States. doi:10.1016/j.jssc.2007.01.020.
@article{osti_21015775,
title = {CeAlO{sub 3} and Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd) solid solutions: Crystal structure, thermal expansion and phase transitions},
author = {Vasylechko, L. and Senyshyn, A. and Materialwissenschaft, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt and Trots, D. and Niewa, R. and Department Chemie, Technische Universitaet Muenchen, Lichtenbergstrasse 4, 85747 Garching and Schnelle, W. and Knapp, M. and CELLS, POB 68, 08193, Barcelona},
abstractNote = {The crystal structures of CeAlO{sub 3} and the solid solutions Ce{sub 1-} {sub x}R{sub x} AlO{sub 3} (R=La, Nd), and their thermal behaviour in a wide temperature range of 12-1200 K have been precisely determined by means of in situ high-resolution X-ray powder diffraction technique applying synchrotron radiation, thermal analysis and magnetic measurements. The unique sequence of the reversible phase transitions I4/mcm{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm has been detected in CeAlO{sub 3} and solid solutions formed in the pseudo-binary system CeAlO{sub 3}-LaAlO{sub 3}. In the Ce{sub 1-} {sub x} Nd {sub x} AlO{sub 3} system, the samples with x=0.3 and 0.5 compositions undergo three phase transformations I2/m{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm, whereas for the Ce-rich sample Ce{sub 0.9}Nd{sub 0.1}AlO{sub 3} four successive transitions are observed: I4/mcm{r_reversible}I2/m{r_reversible}Imma{r_reversible}R3-barc{r_reversible}Pm3-barm. = Crystal structure parameters of all structural polymorphs of CeAlO{sub 3} and solid solutions based on them as well as their thermal evolution are reported. Based on in situ powder diffraction and DTA/DSC data, the phase diagrams of the pseudo-binary systems CeAlO{sub 3}-LaAlO{sub 3} and CeAlO{sub 3}-NdAlO{sub 3} are constructed together with a combined phase diagram, where the transition temperatures are presented as a function of the average radius of rare-earth cations. - Graphical abstract: Combined phase diagram of the CeAlO{sub 3}-LaAlO{sub 3} and CeAlO{sub 3}-NdAlO{sub 3} systems, where the transition temperatures are presented as a function of the average radius of rare-earth cations. The letters indicate L iquid, C ubic, R hombohedral, O rthorhombic, M onoclinic and T etragonal phase fields.},
doi = {10.1016/j.jssc.2007.01.020},
journal = {Journal of Solid State Chemistry},
number = 4,
volume = 180,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}