Abstract
A high pressure Raman scattering study ofBi2MoO6, a member of the bismuth layered Aurivillius family of ferroelectrics, is presented. This studyshowed the onset of two reversible second-order phase transitions near 2.8 and 7.0 GPa. Thepressure dependence of the Raman bands provides strong evidence that the structural changes inBi2MoO6 are mainly related tothe rigid rotations of MoO6 octahedra. Symmetry increases upon application of pressure andthe first phase transition involves, most probably, the loss of theMoO6 tilt mode.This structural change may be the same as that observed at ambient pressure at elevated temperature(from P 21ab to a polar orthorhombic structure of unknown symmetry). The second phase transition isassociated with some subtle structural changes and the structure above 7.0 GPa is mostprobably still orthorhombic.
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