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首页> 外文期刊>Contributions to Mineralogy and Petrology >Thermodynamic data of lawsonite and zoisite in the system CaO–Al2O3–SiO2–H2O based on experimental phase equilibria and calorimetric work
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Thermodynamic data of lawsonite and zoisite in the system CaO–Al2O3–SiO2–H2O based on experimental phase equilibria and calorimetric work

机译：基于实验相平衡和量热工作，CaO–Al2 O3 –SiO2 –H2 O体系中的钙钛矿和皂石热力学数据

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The enthalpy of drop-solution in molten 2PbO·B2O3 of synthetic and natural lawsonite, CaAl2(Si2O7)(OH)2·H2O, was measured by high-temperature oxide melt calorimetry. The enthalpy of formation determined for the synthetic material is Δf H Oxides=–168.7±3.4 kJ mol–1, or Δf H 0 298=–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 optimisation 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 °C were determined by piston cylinder experiments. These results, other recent phase equilibrium data, and new calorimetric and thermophysical data for lawsonite and zoisite, Ca2Al3(SiO4)(Si2O7)O(OH), were used to constrain a mathematical programming analysis of the thermodynamic data for these two minerals in the chemical system CaO–Al2O3–SiO2–H2O (CASH). The following data for lawsonite and zoisite were obtained: ΔfH0298 (lawsonite)=-4,865.68 kJ mol-1 , S0298 (lawsonite)=229.27 J K-1 mol-1 , ΔfH0298 (zoisite)=-6,888.99 kJ mol-1 , S0298 (zoisite)=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：合成和天然钠钙榴石CaAl2 （Si2 O7 ）（OH）2 在熔融的2PbO·B2 O3 熔体中滴入溶液的焓>·H2 通过高温氧化物熔体量热法测定。合成材料确定的形成焓为Δf H氧化物 = – 168.7±3.4 kJ mol–1 ，或Δf H 0 298 = – 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多，而优化方法所产生的放热值略少，但这些值与先前发布的数据在合理范围内一致。通过活塞缸实验，确定了在压力和温度高达5 GPa和850°C的条件下，褐铁矿脱水成菱铁矿，蓝晶石和石英/柯石英的平衡条件。这些结果，其他最近的相平衡数据以及钙钠石和皂石，Ca2 Al3 （SiO4 ）（Si2 O7 ）O的新的量热和热物理数据（OH），用于约束化学体系CaO–Al2 O3 –SiO2 –H2 O中这两种矿物的热力学数据的数学程序分析。现金）。获得了钙钠铝石和皂石的以下数据：Δ f H 0 298 （钙钠铝石）=-4,865.68 kJ mol -1 ， S 0 298 （钠钙榴石）= 229.27 JK -1 mol -1 ，Δ f H 0 298 （黄铁矿）=-6,888.99 kJ mol -1 ， S 0 298 （黄铁矿）= 297.71 JK -1 mol -1 。另外，重新计算钠钙钛矿的体积模量可得出K = 120.7 GPa，与最近的实验工作非常吻合。

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    《Contributions to Mineralogy and Petrology》 |2001年第3期|298-308|共11页
  • 作者

    Klaus-Dieter Grevel; Mirko Schoenitz; Volker Skrok; Alexandra Navrotsky; Werner Schreyer;

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    Institut für Geologie Mineralogie und Geophysik Ruhr-Universität Bochum 44780 Bochum Germany;

    Institut für Geologie Mineralogie und Geophysik Ruhr-Universität Bochum 44780 Bochum Germany;

    Institut für Geologie Mineralogie und Geophysik Ruhr-Universität Bochum 44780 Bochum Germany;

    Thermochemistry Facility Department of Chemical Engineering and Materials Science University of California at Davis Davis CA 95616-8779 USA;

    Institut für Geologie Mineralogie und Geophysik Ruhr-Universität Bochum 44780 Bochum Germany;

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