摘要
在固溶体混合热力学理论推导的基础上,首次给出了固溶体矿物的热容与化学组成的一般关系式。重要的造岩矿物镁橄榄石-铁橄榄石和钙长石-钠长石两对二元固溶体体系的热容与组成呈线性关系;而正铁辉石-顽火辉石二元固溶体则表现出非理想行为,其热容与组成开始呈非线性关系,随着温度升高,才趋于线性。实验资料与理论计算结果吻合。
Based on the theoretical deduction of mixing thermodynamics of solidsolution, the author firstly presents a general relation of the isobaricheat capacity of solid solution mineral as a function of chemical composition.Heat capacities of two of the most important rock-forming mineralssuch as olivine (forsterite-fayalite), plagioclase (anorthite-albite) solidsolutions are linear with their compositions, but that of orthopyroxene(orthoferrosilite-enstatite) demonstrates obvious non-ideal behavior,showing non-linear relation with the mole fraction of orthoferrosilite andtending to be linear with increasing temperature. The experimental dataare well consistent with the theoretically calculated results.
关键词
固溶体
矿物
热容
化学组成
热力学
solid solution
mineral
heat capacity
chemical composition
theoretical model
