High pressure Raman scattering and X-ray diffraction studies of MgNb2O6

Fengxian Huang; Qiang Zhou; Chunli Ma; Liang Li; Xiaoli Huang; Fangfei Li; Qiliang Cui; Dapeng Xu; Wenquan Wang; Tian Cui; Guangtian Zou

doi:10.1039/C3RA22590A

High pressure Raman scattering and X-ray diffraction studies of MgNb₂O₆

Fengxian Huang,^a Qiang Zhou,^a Chunli Ma,^a Liang Li,^a Xiaoli Huang,^a Fangfei Li,*^a Qiliang Cui,^a Dapeng Xu,^b Wenquan Wang,^b Tian Cui^ab and Guangtian Zou^a

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* Corresponding authors

^a State Key Laboratory of Superhard Materials, Jilin University, Changchun, P. R. China
E-mail: lifangfei@jlu.edu.cn

^b College of Physics, Jilin University, Changchun, P. R. China

Abstract

High pressure X-ray diffraction and Raman scattering studies have been carried out on magnesium niobate (MgNb₂O₆) in a diamond anvil cell (DAC) at room temperature up to 40 GPa. A pressure-induced phase transition was observed at pressures above 10 GPa accompanied by a softening of the internal ν₉ (B_3g) modes. Raman scattering results reveal that the distortion of the NbO₆ octahedra decreases under high pressure. According to the X-ray diffraction data, the high pressure phase can be indexed with a monoclinic unit cell. The initial orthorhombic phase changes to a monoclinic phase possibly due to the rotation of the NbO₆ octahedra, similar to some perovskite ABO₃ structures.

$Graphical abstract: High pressure Raman scattering and X-ray diffraction studies of MgNb2O6$

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High pressure Raman scattering and X-ray diffraction studies of MgNb₂O₆

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High pressure Raman scattering and X-ray diffraction studies of MgNb₂O₆

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