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

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.05.018· OSTI ID:21421570

Qingdi, Zhou ^[1]; Avdeev, Maxim ^[2]

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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)

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.

• OSTI ID: 21421570
• Journal Information: Journal of Solid State Chemistry, Vol. 183, 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.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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