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摘要: 用金刚石压砧高压x 射线衍射技术研究了_LiIO_3 在室温高压下的压缩行为, 压力达23.0GPa. 观察到晶格压缩的各向异性, 其c/a 轴比以-6.187 * l0**3 /GPa的速率减小. 得到其常压下的体弹模量B。= 3 9.2 G Pa, 体弹模量对压力的一阶导数B。=3.7 8 7. _LiIO_3在高温高压下转变成四方结构, 与淬火卸压所得的“_LiIO_3, 结构一致.
Abstract: The volume compression of a-LiIO_3_ has been studied by X-ray diffraction in a diamond anvil cell up to 23.0GPa at room temperature. The anisotropic compression of lattice was observed. The ratio of c/a of parameters decreased with a rate of -6.187x 10**(-3)/GPa with pressure. The bulk modulus of normal pressure and its first pressure deviative have been determined to be equal to 39.2 and 3.787GPa respectively. At high pressure and high temperature, hexagonal a-LiIO_3_ transformed to a tetragonal phase. The structure was the same as quenching-releasing pressure phase, i.e., the E phase.