Pressure-dependent phase transition in the ordered BaBi<sub>0.7</sub>Nb<sub>0.3</sub>O<sub>3</sub> perovskite
- Mangalam, R. V. K.
- Narayana, C.
- Sundaresan, A.
DOIAbstract
BaBi0.7Nb0.3O3, an ordered perovskite, crystallizes in a centrosymmetric rhombohedral structure with the space group R3¯. The refined cell parameters obtained from synchrotron powder X-ray diffraction data for the rhombohedral phase at ambient pressure are a = 6.109 (2) Å and α = 60.3 (1)°. The pressure-dependent synchrotron powder X-ray diffraction studies show a phase transition around 8.44 ± 1 GPa, where it transforms from rhombohedral structure to a monoclinic structure. The lattice parameters obtained for the monoclinic phase at a pressure of 15 ± 1 GPa are a = 5.91 (2) Å, b = 6.25 (3) Å and c = 8.22 (1) Å with monoclinic angle, β = 88 (1)°
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