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首页> 外文期刊>Contributions to Mineralogy and Petrology >Thermodynamic data of lawsonite and zoisite in the system Cal-Al_2O_3-SiO_2-H_2O based on experimental phase equilibria and calorimetric work
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Thermodynamic data of lawsonite and zoisite in the system Cal-Al_2O_3-SiO_2-H_2O based on experimental phase equilibria and calorimetric work

机译：基于实验相平衡和量热法的Call-Al_2O_3-CO_2-H_2O体系中的钙钛矿和硅沸石的热力学数据

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摘要

The enthalpy of drop-solution in molten 2PbO centre dot B_2O_3 of synthetic and natural lawsonite, CaAl_2 (Si_2O_7)(OH)_2 centre dot H_2O, was measured by high-temperature oxide melt calorimetry. The enthalpy of formation determined for the synthetic material is triangle open_fH_(298)~0 = - 4,872.5 + - 4.0 kJ mol~(-1). These values are in reasonable agreement with previously published data, although previous calorimetric work yielded slightly more exothermic data and optimization methods resulted in slightly less exothermic values. The equilibrium conditions for the dehydration. Of lawsonite to zoisite, kyanite and quartz/coesite at pressures and temperatures up to 5 GPa and 850 deg C were determined by piston cylinder experiments. These results, other recent phase equilibrium data, and new calorimetric and thermophysical data for lawsonite and zoisite, Ca_2Al_3(SiO_4)(Si_2O_7)O(OH), were used to constrain a mathematical programming analysis of the thermodynamic data for these two minerals in the chemical system CaO-Al_2O_3-SiO_2-H_2O (CASH). The following data for lawsonite and zoisite were obtained: triangle open fH(298)~0 (lawsonite) = 297.71 J K~(-1) mol~(-1). Additionally, a recalculation of the bulk modulus of lawsonite yielded K = 120.7 GPa, which is in good agreement with recent experimental work.
机译：通过高温氧化物熔融量热法测量了合成和天然钠钙榴石CaAl_2（Si_2O_7）（OH）_2中心点H_2O在熔融的2PbO中心点B_2O_3中的滴溶焓。对于合成材料确定的形成焓为三角形open_fH_（298）〜0 =-4,872.5 +-4.0 kJ mol〜（-1）。尽管先前的量热工作产生的放热数据略有增加，而优化方法所产生的放热值略有减少，但这些值与先前发布的数据在合理范围内一致。脱水的平衡条件。通过活塞缸实验确定了在高达5 GPa和850℃的压力和温度下，钙钠铝石到硅铝石，蓝晶石和石英/柯石英。这些结果，其他最近的相平衡数据以及钙钠铝石和方沸石Ca_2Al_3（SiO_4）（Si_2O_7）O（OH）的新的量热和热物理数据被用于约束对这两种矿物的热力学数据的数学编程分析。化学体系CaO-Al_2O_3-SiO_2-H_2O（CASH）。得到了关于钙钠铝石和膨润土的以下数据：三角形开孔fH（298）〜0（钙铝石）= 297.71 J K〜（-1）mol〜（-1）。此外，重新计算钙钠钙石的体积模量可得出K = 120.7 GPa，与最近的实验工作非常吻合。

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