Pressure and temperature-dependent structural studies of Ba{sub 2}BiTaO{sub 6}

Journal Article · Sat Jan 15 00:00:00 EST 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.11.012· OSTI ID:20721687

Wallwork, Kia S ^[1]; Kennedy, Brendan J ^[2]; Zhou, Qingdi ^[2]; Lee, Yongjae ^[3]; Vogt, Thomas ^[3]

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1. Bragg Institute, ANSTO, PMB 1, Menai, NSW 2234 (Australia)
2. Centre for Structural Chemistry and Biology, School of Chemistry, University of Sydney, Centre for Heave Metals Research F11, Sydney, NSW 2006 (Australia)
3. Physics Department, and Centre for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)

The ordered double perovskite Ba{sub 2}BiTaO{sub 6} is shown to undergo a first-order rhombohedral (R3-bar ) to monoclinic (I2/m) phase transition, which can be induced by either lowering the temperature or through the application of pressure. The structures in both phases have been refined from high resolution neutron powder diffraction data at various temperatures, while the high pressure measurements utilised synchrotron X-ray diffraction data. The rhombohedral structure is characterised by out-of-phase tilts about the [111] axis. In the monoclinic structure the tilt axis has changed to be about the [110] axis; however, the magnitude of the tilts in the two structures is remarkably similar.

• OSTI ID: 20721687
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 1; Other Information: DOI: 10.1016/j.jssc.2004.11.012; PII: S0022-4596(04)00610-3; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BISMUTH COMPOUNDS
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
OXIDES
PEROVSKITE
PHASE TRANSFORMATIONS
PRESSURE RANGE MEGA PA 10-100
TANTALUM COMPOUNDS
TEMPERATURE DEPENDENCE
TRIGONAL LATTICES
X-RAY DIFFRACTION