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钼酸铟(In_2(MoO_4)_3)由于其独特的负热膨胀性质,已被广泛应用于燃料电池、光学器件、激光材料等方面.为了进一步探讨其晶体结构和物理性质,本工作在金刚石对顶砧上原位测量了In_2(MoO_4)_3的高压拉曼光谱,最高压力达到18 GPa.在研究的压力范围内,本工作观察到了两次相变.首先,In_2(MoO_4)_3在压力为1.2 GPa时,发生了由从P2_1/a相到低对称结构的相转变.在压力为5.8 GPa时,样品又发生了从晶相到非晶相的第二次相转变.卸压后样品仍为非晶相,说明In_2(MoO_4)_3在高压下的非晶相变为不可逆相变.
Due to its unique negative thermal expansion properties, In 2 (Mo 2 O 4) 3 has been widely used in fuel cells, optical devices, laser materials, etc. In order to further investigate its crystal structure and physical properties, High pressure Raman spectra of In_2 (MoO_4) _3 were measured on the anvil and the maximum pressure reached 18 GPa. Two transitions were observed in this study. Firstly, In_2 (MoO_4) _3 was observed at a pressure of 1.2 GPa, a phase transition from P2_1 / a phase to low symmetry took place.A second phase transition from the crystalline phase to the amorphous phase took place at a pressure of 5.8 GPa.The samples after pressure relief were still The amorphous phase shows that the amorphous phase of In_2 (MoO_4) _3 becomes irreversible phase change under high pressure.