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采用金刚石对顶砧高压装置和同步辐射X射线衍射方法,在常温下对利蛇纹石的高压结构行为进行了研究。原位X射线衍射实验结果表明,利蛇纹石在压力高达31.9 GPa时没有发生相变。利蛇纹石的等温状态方程通过三阶Birch-Murnaghan方程进行表述,得到V0=353.2(7)3,K0=75(3)GPa,K0’=3.4(2)(北京同步辐射高压站实验结果)和V0=356.5(6)3,K0=69(3)GPa,K0’=3.1(3)(上海光源微聚焦站实验结果),两次实验结果基本吻合。利蛇纹石的轴压缩性呈现各向异性(Kc>Kb≈Ka),这与蛇纹石的层状结构有关,在垂直于结构层方向,结构层之间靠氢键来连接,易压缩,压缩系数较大;而在平行结构层方向,压缩系数较小。
The high-pressure structural behavior of the serpentine was studied at room temperature by diamond high-pressure anvil cell and synchrotron radiation X-ray diffraction. In-situ X-ray diffraction results show that no change occurs in the serpentine at pressures up to 31.9 GPa. The isothermal equation of the serpentine is described by the third-order Birch-Murnaghan equation, which gives V0 = 353.2 (7) 3, K0 = 75 (3) GPa, K0 ’= 3.4 (2) (Beijing Synchrotron High Voltage Station Experiment ) And V0 = 356.5 (6) 3, K0 = 69 (3) GPa, K0 ’= 3.1 (3) (Shanghai Light Source Microfocus Station experimental results), the two experimental results are basically consistent. Axis compressibility of the serpentine presents anisotropy (Kc> Kb≈Ka), which is related to the layered structure of serpentine. In the direction perpendicular to the structural layer, the structural layers are connected by hydrogen bonds and are easy to compress , The compression coefficient is larger; while in the parallel structure layer direction, the compression coefficient is smaller.