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Pressure-induced phase transition and octahedral tilt system change of Ba₂BiSbO₆

Authors:	Michael W Lufaso Yongjae Lee Hans-Conrad zur Loye

Institution:	^a Department of Chemistry & Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA ^b Department of Earth System Sciences, Yonsei University, Seoul 120749, South Korea

Abstract:	High-resolution X-ray synchrotron powder diffraction studies under high-pressure conditions are reported for the ordered double perovskite Ba₂BiSbO₆. Near 4 GPa, the oxide undergoes a pressure-induced phase transition. The symmetry of the material changes during the phase transition from space group to space group I2/m, which is consistent with a change in the octahedral tilting distortion from an a⁻a⁻a⁻ type to a⁰b⁻b⁻ type using the Glazer notation. A fit of the volume-pressure data using the Birch-Murnagaham equation of state yielded a bulk modulus of 144(8) GPa for the rhombohedral phase.

Keywords:	High pressure Phase transition Double perovskite
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