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摘要: 利用金刚石对顶砧(DAC)高压装置产生高压,使用体积比为16∶3∶1的甲醇、乙醇和水混合液作为传压介质,通过原位高压同步辐射技术对氧化镓的高压行为进行了研究(0~42.5 GPa)。实验发现在室温下13.3 GPa压力附近,单斜结构的氧化镓发生了结构相变,变成三角结构。相变后镓离子由原来同时位于由氧离子围成的四面体和八面体的中心位置变成只位于八面体的中心位置。卸压后的X射线衍射谱表明,氧化镓又恢复为单斜结构,该相变为可逆相变。Abstract: The in-situ synchrotron radiation diffraction of gallium oxide under high pressure has been studied in the range of 0~42.5 GPa with diamond anvil cell (DAC), using methanol-ethanol-water (16∶3∶1) mixture as transmission medium. We have found that under room temperature, the monoclinic gallium oxide turns into a rhombohedral one under 13.3 GPa. After the phase changs, the Ga ions are only at the centers of the octahedrons instead of their original locations which are at both the centers of the octahedrons and the tetrahedrons. When the pressure goes back to ambient pressure, the sample turns back to monoclinic structure.
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Key words:
- gallium oxide /
- synchrotron radiation /
- high pressure /
- phase transition
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Zoltan Hajnal,Jozsef Miro,Gabor Kiss,et al.Role of Oxygen Vacancy Defect States in the n-Type Conduction of -Ga2O3 [J]. J Appl Phys, 1999, 86(7): 3792-3796. Wu X C, Song W H, Huang W D,et al.Crystalline Gallium Oxide Nanowires:Intensive Blue Light Emitters [J]. Chemical Physics Letters, 2000, 328: 5-9. Rustum Roy, Hill V G, Osborn E F.Polymorphism of Ga2O3 and the System Ga2O3-H2O [J]. Journal of American Chemistry, 1952, 74: 719-722. Geller S.Crystal Structure of -Ga2O3 [J]. Journal of Chemical Physics, 1960, 33(3): 676-684. Marezio M, Remeika J P. Bond Lengths in the -Ga2O3 Structure and the High-Pressure Phase of Ga2-xFexO3 [J]. Journal of Chemical Physics, 1967, 46(5): 1862-1865. LIU Jing, ZHAO Jing, CHE Rong-zheng, et al. In Situ Energy Dispersive Diffraction under High Pressure Using Synchrotron Radiation [J]. Chinese Journal of High Pressure Physics, 2000, 14(4): 247-252. (in Chinese) 刘景, 赵菁, 车荣钲, 等.高压下的同步辐射能量色散粉末衍射 [J]. 高压物理学报, 2000, 14(4): 247-252.
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