Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica

TORU Sugawara; Masaki Akaogi

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Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica

机译：透辉石-钙长石-钙锰矿，透辉石-钙长石-镁橄榄石和透辉石-二氧化硅体系中硅酸盐液体的混合热

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Fusion enthalpies were measured by differential scanning calorimetry (DSC) for mineral mixtures of eutectic composition in the systems anorthite-diopside (An₄₂Di₅₈, wt%), anorthite-akermanite (An₄₆Ak₅₄), akermanite-diopside (Ak₄₂Di₅₈), diopside-silica (Di₈₄Qt₁₆), and anorthite-diopside-forsterite (Di₄₉Fo_7.5An_43.5), along with akermanite. Heats of mixing of silicate liquid in those systems were calculated based on the DSC data. The liquids of Di₄₉Fo_7.5An_43.5, An₄₂Di₅₈, An₄₆Ak₅₄, and Ak₄₂Di₅₈ have negative excess enthalpies of –4 to –10 (±5) kJ/mol, whereas the Di₈₄Qt₁₆ liquid has positive excess enthalpy of 5.0(±1.7) kJ/mol. Those values are consistent with the heats of mixing estimated by thermodynamic analyses of phase equilibria of the above systems. The results suggest that the differential scanning calorimetry is useful and sufficiently accurate for direct calorimetric measurement of small endothermic or exothermic heat of mixing in silicate liquid.

机译：通过差示扫描量热法（DSC）测量了钙长石-透辉石（An _{42 Di _{58 ，wt％），钙长石-钙锰矿（An _{46 Ak _{54 ），钙锰矿-透辉石（Ak _{42 Di _{58 ），透辉石二氧化硅（Di _{84 Qt _{16 ），和钙长石-透辉石-镁橄榄石（Di _{49 Fo _{7.5 An _{43.5 ），以及钙锰矿。根据DSC数据计算在那些系统中的硅酸盐液体的混合热。 Di _{49 Fo _{7.5 An _{43.5 ， An _{42 Di _{58 ，An _{46 Ak _{54 和Ak _{42 Di _{58 具有负过量焓< sup> 介于–4到–10（±5）kJ / mol，而Di _{84 Qt _{16 液体具有正值过量焓为5.0（±1.7）kJ / mol。这些值与通过上述系统的相平衡热力学分析估计的混合热一致。结果表明，差示扫描量热法对于直接量热法测量少量混合吸热或放热热量有用且足够准确在硅酸盐液体中。}}}}}}}}}}}}}}}}}}}}}}

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《American Mineralogist》 |2003年第7期|00001020-00001024|共5页
作者
TORU Sugawara; Masaki Akaogi;
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Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan;

Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan;

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Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica

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