【摘要】 采用同步辐射高压原位Ｘ光衍射技术及金刚石对顶压砧高压装置，对γ－Ｆｅ＿２ＳｉＯ＿４进行了静水压条件下等温压缩行为的测定，最高压力达２３ＧＰａ。γ－Ｆｅ＿２ｓｉＯ＿４在０～２３ＧＰａ压力范围内的ｐ、Ｖ数据表明，其等温压缩可分为两个阶段：若设Ｋ＇＿０＝４，在０～１８Ｇｐａ，Ｋ＿０＝１８９±２ＧＰａ；而在１８～２３０Ｐａ，Ｋ＿０＝２１３±２ＧＰａ。我们认为，样品在１８ＧＰａ以下处于较好的静水压状态，压力超过１８ＧＰａ，传压介质的静水压性质变坏，所以Ｋ＿０值偏高。在整个实验过程中并未发现样品有任何发生相变的迹象。最后，对一些虽然使用了液体介质但得不到静水压条件的实验现象进行了讨论。更多还原

【Abstract】 The compressive behavior of γ-Fe₂SiO₄ at high pressure up to 23 GPa and room temperature has been measured by using synchrotron radiation and in situ high pressure X-ray diffraction techniques with DAC.The p-V relationship of γ-Fe₂SiO₄ at 0～23 GPa indicated that the isothermal compression process can be divided into two steps : if K₀=4 ,the bulk modulus K₀ =189±2 GPa at 0～18 GPa ,and K₀=21 3±2 GPa at 18～23 GPa.We didn’t find any imfor-mation of the phase transformation of -Fe₂SiO₄ in the whole experimental process. Based on the experimental data ,it seems to us that the sample was in quite good hydrostatic pressure up to 18 GPa, but was in nonhydrostatic pressure due to solidifieation of the liquid medium when the pres-sure beyond 18 GPa.Finally, the phenomenon that the sample with incorrect loading method has higher K₀ in those hydrostatic pressure experiments is discussed.更多还原