The effect of disorder in Ba{sub 2}YTaO{sub 6} on the tetragonal to cubic phase transition

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.12.011· OSTI ID:21494248

Zhou, Qingdi ^[1]; Kimpton, Justin A ^[2]

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1. School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia (Australia)
2. Australian Synchrotron, 800 Blackburn Rd, Clayton, Victoria 3168 (Australia)

Synchrotron X-ray diffraction and Raman spectroscopy have been used to study the structure of the complex perovskite Ba{sub 2}YTaO{sub 6}, at temperatures down to 100 K. Where the Ta and Y cations exhibit long-range rock-salt like ordering, Ba{sub 2}YTaO{sub 6} displays a continuous phase transition from a high temperature cubic structure, described in space group Fm3-bar m, to a tetragonal, I4/m, structure near 260 K. This transition is inhibited if extensive disorder and/or vacancies are/is present in the sample. -- Graphical abstract: The tetragonal-cubic phase transition observed in the cation ordered double perovskite Ba{sub 2}YTaO{sub 6} is inhibited when these are disordered. Display Omitted Highlights: {yields} Double perovskite Ba{sub 2}YTaO{sub 6} characterised by XRD and Raman spectroscopy. {yields} Cubic-tetragonal transition in Ba{sub 2}YTaO{sub 6} studied. {yields} Impact of disorder on the structure and phase transitions established.

• OSTI ID: 21494248
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 4; Other Information: DOI: 10.1016/j.jssc.2010.12.011; PII: S0022-4596(10)00549-9; 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
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM COMPOUNDS
CUBIC LATTICES
PEROVSKITE
PHASE TRANSFORMATIONS
RAMAN SPECTROSCOPY
SPACE GROUPS
TANTALATES
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
VACANCIES
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
LASER SPECTROSCOPY
MINERALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PEROVSKITES
POINT DEFECTS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTROSCOPY
SYMMETRY GROUPS
TANTALUM COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS