Investigation into high-pressure behavior of MnTiO3: X-ray diffraction and Raman spectroscopy with diamond anvil cells
Investigation into high-pressure behavior of MnTiO3: X-ray diffraction and Raman spectroscopy with diamond anvil cells
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DOI：
10.1016/j.gsf.2010.09.003
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发表时间：
2011
影响因子：
8.9
通讯作者：
Xiang Wu;S. Qin;L. Dubrovinsky
中科院分区：
文献类型：
--
作者：
Xiang Wu;S. Qin;L. Dubrovinsky
采用金刚石对顶砧X射线衍射和拉曼光谱研究了钛酸锰MnTiO 3在高压下的结构稳定性。钛铁矿型MnTiO 3至少在26.6 GPa下是稳定的，锂钛酸盐型MnTiO 3在室温下在2.0 GPa下可逆地转变为钙钛矿。钛铁矿、钛酸锂和钙钛矿的体积模量（K300）分别为174（4）GPa、179（8）GPa和208（5）GPa（在固定的一阶压力导数K′ = 4）。Grüneisen参数γ估计为钛铁矿的1.28和钙钛矿的1.75。在钛铁矿相中，随着压力的增加，TiO6八面体变得更加规则。在钙钛矿相中，结构变形随着压力的增加而增加。
The structural stability of manganese titanate MnTiO3at high pressure was investigated by X-ray diffraction and Raman spectroscopy with diamond anvil cells. Ilmenite-type MnTiO3is stable at least to 26.6 GPa, and lithium niobate type MnTiO3reversibly transforms at room temperature to perovskite at 2.0 GPa. Bulk moduli (K300) of ilmenite, lithium niobate and perovskite are 174(4) GPa, 179(8) GPa, and 208(5) GPa, respectively (at fixed first pressure derivative K′ = 4). The Grüneisen parameter γ has been estimated to be 1.28 for ilmenite and 1.75 for perovskite. In ilmenite phase, TiO6octahedra become more regular with increasing pressure. In perovskite phase structural distortion increases with pressure increase.