高温高压条件下γ-Mg_2SiO_4中CaO的固溶度的实验研究
摘要
采用川井型多顶砧高压装置研究了CaO(5w.t.%)-Mg2SiO4体系在压力16—22GPa,温度为1000—1600℃条件下的物质成分及其结构形态特征,并探讨了CaO在γ相中的固溶度及其随温度和压力的变化情况以及对后尖晶石相变的可能影响.研究结果表明:CaO在γ相中的固溶度很有限(<0.20%);随着温度、压力的升高,CaO在γ相中的固溶度增加.由于CaO在γ相中的固溶度很低,因此固溶在γ相中的CaO对后尖晶石相变压力可能不会产生很大的影响.
基金
国家自然科学基金资助项目(批准号:40402006)
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