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Title: The magnetoelectric perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9}: An insight from magnetic measurements and neutron powder diffraction

Abstract

A study of the crystallographic and magnetic structures of the double perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9} has been carried out on a polycrystalline sample using neutron powder diffraction (NPD) data between 10 and 650 K. An analysis of the NPD patterns at room temperature has shown that this compound crystallises in the tetragonal space group I4/m with a = 5.5614(7) A and c = 7.867(1) A and has a partially ordered arrangement of Fe and Te at the B-sites. The compound undergoes an I4/m {sup {yields}} Fm-3m improper ferroelectric phase transition near 460 K. A low-temperature ferrimagnetic ordering (below T {sub N} = 260 K) has been followed from the magnetisation measurements and sequential NPD data analysis. In good agreement with magnetic measurements the ferrimagnetic structure with very weak magnetisation is defined by the propagation vector k = (0, 0, 0). In addition to the obtained experimental results on magnetic and electric properties some aspects of magnetoelectricity in this perovskite are also discussed and compared with those of another quaternary oxide Sr{sub 3}Fe{sub 2}B{sup 6+}O{sub 9}.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Department of Inorganic Materials, Karpov' Institute of Physical Chemistry, Ul. Vorontsovo Pole, 10 105064 Moscow K-64 (Russian Federation). E-mail: ivan@cc.nifhi.ac.ru
  2. Department of Engineering Sciences, University of Uppsala, Uppsala (Sweden). E-mail: per.nordblad@angstrom.uu.se
  3. Department of Inorganic Chemistry, University of Gothenburg (Sweden). E-mail: stene@inoc.chalmers.se
  4. Department of Materials Chemistry, The Angstrom Laboratory, Uppsala University, Uppsala (Sweden). E-mail: rte@mkem.uu.se
  5. Department of Materials Chemistry, The Angstrom Laboratory, Uppsala University, Uppsala (Sweden)
Publication Date:
OSTI Identifier:
21000625
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 42; Journal Issue: 4; Other Information: DOI: 10.1016/j.materresbull.2006.07.016; PII: S0025-5408(06)00295-9; Copyright (c) 2006 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:
36 MATERIALS SCIENCE; CERAMICS; CRYSTALLOGRAPHY; DATA ANALYSIS; ELECTRICAL PROPERTIES; FERROELECTRIC MATERIALS; MAGNETIC FIELDS; MAGNETIZATION; NEUTRON DIFFRACTION; OXIDES; PEROVSKITE; PHASE TRANSFORMATIONS; POLYCRYSTALS; SPACE GROUPS; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES

Citation Formats

Ivanov, S.A., Nordblad, P., Eriksson, S.-G., Tellgren, R., and Rundloef, H.. The magnetoelectric perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9}: An insight from magnetic measurements and neutron powder diffraction. United States: N. p., 2007. Web. doi:10.1016/j.materresbull.2006.07.016.
Ivanov, S.A., Nordblad, P., Eriksson, S.-G., Tellgren, R., & Rundloef, H.. The magnetoelectric perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9}: An insight from magnetic measurements and neutron powder diffraction. United States. doi:10.1016/j.materresbull.2006.07.016.
Ivanov, S.A., Nordblad, P., Eriksson, S.-G., Tellgren, R., and Rundloef, H.. Thu . "The magnetoelectric perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9}: An insight from magnetic measurements and neutron powder diffraction". United States. doi:10.1016/j.materresbull.2006.07.016.
@article{osti_21000625,
title = {The magnetoelectric perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9}: An insight from magnetic measurements and neutron powder diffraction},
author = {Ivanov, S.A. and Nordblad, P. and Eriksson, S.-G. and Tellgren, R. and Rundloef, H.},
abstractNote = {A study of the crystallographic and magnetic structures of the double perovskite Sr{sub 3}Fe{sub 2}TeO{sub 9} has been carried out on a polycrystalline sample using neutron powder diffraction (NPD) data between 10 and 650 K. An analysis of the NPD patterns at room temperature has shown that this compound crystallises in the tetragonal space group I4/m with a = 5.5614(7) A and c = 7.867(1) A and has a partially ordered arrangement of Fe and Te at the B-sites. The compound undergoes an I4/m {sup {yields}} Fm-3m improper ferroelectric phase transition near 460 K. A low-temperature ferrimagnetic ordering (below T {sub N} = 260 K) has been followed from the magnetisation measurements and sequential NPD data analysis. In good agreement with magnetic measurements the ferrimagnetic structure with very weak magnetisation is defined by the propagation vector k = (0, 0, 0). In addition to the obtained experimental results on magnetic and electric properties some aspects of magnetoelectricity in this perovskite are also discussed and compared with those of another quaternary oxide Sr{sub 3}Fe{sub 2}B{sup 6+}O{sub 9}.},
doi = {10.1016/j.materresbull.2006.07.016},
journal = {Materials Research Bulletin},
number = 4,
volume = 42,
place = {United States},
year = {Thu Apr 12 00:00:00 EDT 2007},
month = {Thu Apr 12 00:00:00 EDT 2007}
}
  • A study of the crystallographic and magnetic structure of the double perovskite Sr{sub 2}CoMoO{sub 6} (SCMO) has been carried out on a polycrystalline sample using neutron powder diffraction (NPD) data between 10 and 700 K. An analysis of the NPD patterns at room temperature has shown that this compound crystallises in the tetragonal space group I4/m with a = 5.5616(1) A and c 7.9470(2) A and has a 1:1 ordered arrangement of Co and Mo at the B-sites. This compound undergoes a I4/m {yields} Fm3m improper ferroelectric phase transition near 560 K. A low-temperature antiferromagnetic ordering (below T {sub N}more » = 36 K) has been followed from sequential NPD data analysis. The antiferromagnetic structure is defined by the propagation vector k = (1/2, 0, 1/2). In addition to the obtained experimental results on magnetic and electric properties some aspects of magnetoelectricity in this perovskite are also discussed.« less
  • A polycrystalline sample of perovskite-like Sr{sub 3}Fe{sub 2}TeO{sub 9} has been prepared in a solid-state reaction and studied by a combination of electron microscopy, Mössbauer spectroscopy, magnetometry, X-ray diffraction and neutron diffraction. The majority of the reaction product is shown to be a trigonal phase with a 2:1 ordered arrangement of Fe{sup 3+} and Te{sup 6+} cations. However, the sample is prone to nano-twinning and tetragonal domains with a different pattern of cation ordering exist within many crystallites. Antiferromagnetic ordering exists in the trigonal phase at 300 K and Sr{sub 3}Fe{sub 2}TeO{sub 9} is thus the first example of amore » perovskite with 2:1 trigonal cation ordering to show long-range magnetic order. At 300 K the antiferromagnetic phase coexists with two paramagnetic phases which show spin-glass behaviour below ~80 K. - Graphical abstract: Sr{sub 3}Fe{sub 2}TeO{sub 9} has a 2:1 ordered arrangement of Fe{sup 3+} and Te{sup 6+} cations over the octahedral sites of a perovskite structure and is antiferromagnetic at room temperature. - Highlights: • 2:1 Cation ordering in a trigonal perovskite. • Magnetically ordered trigonal perovskite. • Intergrowth of nanodomains in perovskite microstructure.« less
  • The structural properties of complex perovskite lead iron tungstate, Pb(Fe{sub 2/3}W{sub 1/3})O{sub 3} (PFW) which belongs to a class off disordered magnetoelectrics has been studied by neutron powder diffraction. Rietveld refinement of neutron powder diffraction data collected at different temperatures, between 10 and 700K, have been carried out in order to extract structural information. The long-range structure of PFW is a cubic one (space group Pm3-bar m) within the whole temperature interval. The PFW sample demonstrated very low thermal expansion at lower temperatures. The iron and tungsten ions were found to be disordered over the perovskite B-sites. Pb cations showmore » a position disorder shifting from their high-symmetry positions along the [111] direction. Furthermore, in order to obtain a good agreement with experiment at low temperatures, below T{sub N}, it was necessary to assign non-zero magnetic moments to the iron ions, these being in a co-linear antiferromagnetic arrangement in accordance with the antiferroelectric properties of PFW. The magnetic structure can be described with a doubling of the unit cell axes. The factors governing the observed nuclear and magnetic structures of PFW are discussed and compared with those of other quaternary iron-containing perovskites.« less
  • We describe the preparation and structural characterization by X-ray powder diffraction (XRPD) and Moessbauer spectroscopy of three electron-doped perovskites Sr{sub 3}Fe{sub 2}MoO{sub 9-{delta}} with Fe/Mo = 2 obtained from Sr{sub 3}Fe{sub 2}MoO{sub 9}. The compounds were synthesized by topotactic reduction with H{sub 2}/N{sub 2} (5/95) at 600, 700 and 800 {sup o}C. Above 800 {sup o}C the Fe/Mo ratio changes from Fe/Mo = 2-1 < Fe/Mo < 2. The structural refinements of the XRPD data for the reduced perovskites were carried out by the Rietveld profile analysis method. The crystal structure of these phases is cubic, space group Fm3-bar m,more » with cationic disorder at the two different B sites that can be populated in variable proportions by the Fe atoms. The Moessbauer spectra allowed determining the evolution of the different species formed after the treatments at different temperatures and confirm that Fe ions in the samples reduced at 600, 700 and 800 {sup o}C are only in the high-spin Fe{sup 3+} electronic state.« less
  • The structure of PbBa{sub 0.8}Sr{sub 1.2}PrCeCu{sub 3}O{sub 9} has been determined with powder neutron diffraction techniques and profile analysis. The symmetry of this oxide is pseudotetragonal P4mm, but ED study shows that it is orthorhomic, space group Cmm2, with cell parameters a = 5.4816(1) {angstrom}, b = 5.4703(1) {angstrom}, and c = 16.4017(4) {angstrom}. The structure of this oxide corresponds to a triple intergrowth of single and double oxygen-deficient perovskite layers, with single rock salt and double fluorite-type layers. The analysis of the structure does not show any statistical distribution of copper and lead in the same sites, contrary tomore » what was found for similar compositions. The main original structural features are: (a) the disordered distribution of oxygen in the PbO layers and the distorted tetrahedral coordination of lead PbO{sub 3}L due to the 6s{sup 2} lone pair of Pb(II)(L); (b) the angle of the O-Cu-O bond of univalent copper (164{degree}); (c) the off-centering of rare earth elements in the 'O{sub 8}' cages, which move away from the copper layers; and (d) the displacement of Cu(II) inside the CuO{sub 5} pyramids toward the apical oxygen. A comparison with Pb{sub 2}Sr{sub 2}YCu{sub 3}O{sub 8}-type structures is made.« less