Determination of Gibbs free energies of formation for the silicates MnSiO3, Mn2SiO4 and Mn7SiO12 in the temperature range 1000–1350 K by solid state emf measurements
Determination of Gibbs free energies of formation for the silicates MnSiO3, Mn2SiO4 and Mn7SiO12 in the temperature range 1000–1350 K by solid state emf measurements
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通过固态电动势测量确定硅酸盐 MnSiO3、Mn2SiO4 和 Mn7SiO12 在 1000–1350 K 温度范围内的吉布斯生成自由能
DOI：
10.1007/bf00202136
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
E. Rosén
中科院分区：
文献类型：
--
作者：
J. H. Huang;E. Rosén
矿物蔷薇辉石 (MnSiO3)、软辉石 (Mn2SiO4) 和褐铜矿 (Mn7SiO12) 的标准吉布斯生成自由能 (AfG0) 通过测量以下氧化还原平衡的氧逸度来确定：3Mn2SiO4(s)+1/2O2(g)⇌3MnSiO3(s)+Mn3O4(s) MnSiO3(s)+2Mn3O4(s)+1/22O2(g)⇌Mn7SiO12(s) 和 7MnSiO3(s)+3/2O2(g⇌Mn7SiO12)(s)+6SiO2(s) 测量采用氧化钙稳定氧化锆作为电解质材料的固态电动势技术进行。覆盖的温度范围为 1000–1350 K。获得的结果用于在 1200 K 下构建图表，轴为 lgf(O2)-摩尔比 Si/(Si+Mn)，以指示硅酸锰的稳定范围。
Standard Gibbs free energies of formation (AfG0) for the minerals rhodonite (MnSiO3), tephroite (Mn2SiO4) and braunite (Mn7SiO12) have been determined by measuring the oxygen fugacities of the following redox equilibria: 3Mn2SiO4(s)+1/2O2(g)⇌3MnSiO3(s)+Mn3O4(s) MnSi03(s)+2Mn3O4(s)+1/22O2(g)⇌Mn7SiO12(s) and 7MnSiO3(s)+3/2O2(g⇌Mn7SiO12)(s)+6SiO2(s) The measurements were performed by means of the solid-state emf technique involving calcia-stabilized zirconia as electrolyte material. The temperature range covered was 1000–1350 K.The results obtained were used to construct a diagram at 1200 K with the axes lgf(O2)-molar ratio Si/(Si+Mn) to indicate the stability ranges of the manganese silicates.