The solvus in the system MnCO3-CaCO3
The solvus in the system MnCO3-CaCO3
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MnCO3-CaCO3 体系中的固溶线
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
T. Peters
中科院分区：
文献类型：
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作者：
C. Capitani;T. Peters
在10千巴和更低的压力下，实验研究了MnCO_3-CaCO_3体系富锰侧的固溶线。临界点位于540 °C和Mn0.68Ca0.32CO3。死亡的反应速度极其缓慢。给出了（Mn，Ca）CO_3固溶体的X射线校准曲线。对300多个不同变质程度的锰钙硅酸盐大理岩碳酸盐样品的微探针分析证实了实验导出的溶线，并由实验溶线导出了Margules参数，得到旋节线不混合的Wa=20.1+0.032·T和Wb=18.3-0.0033·T，而对于双结点非混合，Wa=−22.9+0.035 ·T和Wb=3.36+0.0147·T（所有W，单位为kJ/-mol）基于固溶体中离子半径的变形，给出了对马古勒参数的物理解释。由该模型得到的Margules参数与实验数据吻合较好。
The solvus on the Mn-rich side in the system MnCO3-CaCO3 was studied experimentally at 10 kb and lower pressures. The critical point lies at 540 °C and Mn0.68Ca0.32CO3. Reaction rates of demising are extremely sluggish. X-ray calibration curves for (Mn, Ca)CO3 solid solutions are given. Depicting microprobe analyses of about 300 carbonates from manganese calc silicate marbles affected by different degrees of metamorphism confirm the experimentally derived solvus.Margules parameters were derived from the experimental solvus, giving for spinodal unmixing Wa=20.1+0.032·T and Wb=18.3-0.0033·T, and for binodal unmixing Wa=−22.9+0.035 ·T and Wb=3.36+0.0147·T (All W, in kJ/-mol)A physical interpretation of the Margules parameters based on deformations of the ionic radii in the solid solution is presented. The Margules parameters obtained by this model agree fairly well with the experimental data.