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本文用改进了的高压下差热分析方法以及金刚石压砧加温下的X射线衍射方法研究了硫酸锂钾(LiKSO4)在室温以上的高压相变,较精确地测定了在3GPa、800℃以下各相的平衡条件,作出了它的P-T状态图。本文发现LiKSO4在1.65GPa以上压力存在一个高压结构,标定了它的晶体参数,测量了它在高压下的热膨胀行为,并研究了高压相在常压时的热稳定性。The high pressure transition and phase equilibrium beheviour of lithium potassium sulphate (LiKSO4) were studied by an improved high pressure DTA method and X-ray diffraction in a diamond anvil cell at elevated temperatures. The P-T phase diagram was accurately determined up to 3GPa and 800℃. A high pressure modification of LiKSO4 was observed beyond 1.65 GPa. The structure was determined to be orthorhombic with a = 7.933 ?, b = 9.493 ? and c= 9.679 ?, and its thermal expansion at high pressure and the stability of the quenched sample at normal pressure were also examined.
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