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Title: Structural studies of the disorder and phase transitions in the double perovskite Sr{sub 2}YTaO{sub 6}

Abstract

The evolution of the crystal structure of the double perovskite Sr{sub 2}YTaO{sub 6} from room temperature to 1250 {sup o}C has been studied using powder neutron and synchrotron X-ray diffraction. At room temperature Sr{sub 2}YTaO{sub 6} crystallises in a monoclinic superstructure with the space group P2{sub 1}/n. The tilting of the octahedra evident in the room temperature structure is progressively lost on heating, resulting in a sequence of phase transitions that ultimately yields the cubic structure in space group Fm3m. The high temperature tetragonal and cubic phases are characterised by strongly anisotropic displacements of the anions. The amount of defects in the crystal structure of Sr{sub 2}YTaO{sub 6} is found to be sensitive to the preparative method. - Graphical abstract: Sr{sub 2}YTaO{sub 6} undergoes a sequence of phase transitions upon heating associated with the removal of the tilting of the octahedral. The number of defects in the structure is sensitive to the preparative conditions.

Authors:
 [1];  [2]
  1. School of Chemistry, University of Sydney, Sydney, NSW 2006 (Australia)
  2. Bragg Institute, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234 (Australia)
Publication Date:
OSTI Identifier:
21421570
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2010.05.018; PII: S0022-4596(10)00219-7; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FCC LATTICES; MONOCLINIC LATTICES; OXIDES; PEROVSKITE; PHASE TRANSFORMATIONS; STRONTIUM COMPOUNDS; TANTALUM COMPOUNDS; TEMPERATURE RANGE 0273-0400 K; YTTRIUM COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; MINERALS; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITES; REFRACTORY METAL COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS

Citation Formats

Qingdi, Zhou, Kennedy, Brendan J., E-mail: b.kennedy@chem.usyd.edu.a, and Avdeev, Maxim. Structural studies of the disorder and phase transitions in the double perovskite Sr{sub 2}YTaO{sub 6}. United States: N. p., 2010. Web. doi:10.1016/j.jssc.2010.05.018.
Qingdi, Zhou, Kennedy, Brendan J., E-mail: b.kennedy@chem.usyd.edu.a, & Avdeev, Maxim. Structural studies of the disorder and phase transitions in the double perovskite Sr{sub 2}YTaO{sub 6}. United States. https://doi.org/10.1016/j.jssc.2010.05.018
Qingdi, Zhou, Kennedy, Brendan J., E-mail: b.kennedy@chem.usyd.edu.a, and Avdeev, Maxim. 2010. "Structural studies of the disorder and phase transitions in the double perovskite Sr{sub 2}YTaO{sub 6}". United States. https://doi.org/10.1016/j.jssc.2010.05.018.
@article{osti_21421570,
title = {Structural studies of the disorder and phase transitions in the double perovskite Sr{sub 2}YTaO{sub 6}},
author = {Qingdi, Zhou and Kennedy, Brendan J., E-mail: b.kennedy@chem.usyd.edu.a and Avdeev, Maxim},
abstractNote = {The evolution of the crystal structure of the double perovskite Sr{sub 2}YTaO{sub 6} from room temperature to 1250 {sup o}C has been studied using powder neutron and synchrotron X-ray diffraction. At room temperature Sr{sub 2}YTaO{sub 6} crystallises in a monoclinic superstructure with the space group P2{sub 1}/n. The tilting of the octahedra evident in the room temperature structure is progressively lost on heating, resulting in a sequence of phase transitions that ultimately yields the cubic structure in space group Fm3m. The high temperature tetragonal and cubic phases are characterised by strongly anisotropic displacements of the anions. The amount of defects in the crystal structure of Sr{sub 2}YTaO{sub 6} is found to be sensitive to the preparative method. - Graphical abstract: Sr{sub 2}YTaO{sub 6} undergoes a sequence of phase transitions upon heating associated with the removal of the tilting of the octahedral. The number of defects in the structure is sensitive to the preparative conditions.},
doi = {10.1016/j.jssc.2010.05.018},
url = {https://www.osti.gov/biblio/21421570}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 8,
volume = 183,
place = {United States},
year = {Sun Aug 15 00:00:00 EDT 2010},
month = {Sun Aug 15 00:00:00 EDT 2010}
}