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

✍ Scribed by Michael W. Lufaso; René B. Macquart; Yongjae Lee; Thomas Vogt; Hans-Conrad zur Loye

Book ID
104029476
Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
264 KB
Volume
179
Category
Article
ISSN
0022-4596

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✦ Synopsis

High-resolution X-ray synchrotron powder diffraction studies under high-pressure conditions are reported for the ordered double perovskite Ba 2 BiSbO 6 . Near 4 GPa, the oxide undergoes a pressure-induced phase transition. The symmetry of the material changes during the phase transition from space group R 3 to space group I2/m, which is consistent with a change in the octahedral tilting distortion from an a À a À a À type to a 0 b À b À 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.

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