Abstract

In situ Raman spectroscopy in a diamond anvil cell (DAC) is used to study ОН-perovskite MgSi(OH)₆ under compression in water and carbonate fluids at high Р–Т parameters (up to 14 GPa, 420°С). The ОН-perovskite ↔ 10 Å phase + хН₂О transition is either partially reversible or irreversible when there is a deficit of water in the system. When ОН-perovskite is compressed in carbonate fluid, the reversible transition shifts slightly to higher pressures, testifying to the drop in the activity of water when carbonate is added in the system.

中文翻译：

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高Р–Т参数（高达14 GPa，420°С）下的ОН钙钛矿MgSi（OH）6的原位拉曼研究

摘要

使用金刚石砧盒（DAC）中的原位拉曼光谱研究在高Р–Т参数（高达14 GPa，420°С）下在水和碳酸盐流体中受压的ОН钙钛矿MgSi（OH）₆。所述ОН钙钛矿↔10埃相+ х Н ₂ О过渡是或者部分可逆或不可逆时，有水在系统中的赤字。当О-钙钛矿在碳酸盐流体中压缩时，可逆转变会略微移至较高压力，这证明了在系统中添加碳酸盐时水活度的下降。