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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Structure relaxation of silicate melts containing iron oxide
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Structure relaxation of silicate melts containing iron oxide

机译：含氧化铁的硅酸盐熔体的结构弛豫

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摘要

The changes of oxidation states and coordination structures of iron ions in the liquid state of calcium-silicate (40 mol% CaO-40 mol% SiO2-20 mol% Fe2O3) during the equilibration process have been determined by Mossbauer spectroscopy. The fraction of Fe3+ ions to the total iron ions became constant within 2 h after the equilibration operation was started at 1773 K. Samples were then melted at 1608, 1678, 1773, and 1858 K for soak times ranging from 2 to 72 h in Pt crucibles in air and then quenched in water. On the other hand, it took 20 and 6 h for the coordination structures of Fe3+ ions to settle down by sharing between tetrahedral and octahedral sites when the samples were melted at 1608 and 1678 K, respectively. It was assumed that the coordination in the liquid is determined by rearrangement of oxygen ions. The fraction of Fe3+ ions in tetrahedral symmetry to the total Fe3+ ions at equilibrium decreased with increasing temperature. The standard enthalpy change for the reaction of the change of Fe3+ ions in the coordination structure was calculated as 68.6 +/- 17.3 K/mol(-1). (C) 2001 Elsevier Science B.V. All rights reserved. [References: 22]
机译：通过Mossbauer光谱法确定了平衡过程中硅酸钙（40 mol％CaO-40 mol％SiO2-20 mol％Fe2O3）液态下铁离子的氧化态和配位结构的变化。在平衡操作开始于1773 K后2 h之内，Fe3 +离子占总铁离子的比例保持恒定。然后将样品在1608、1678、1773和1858 K处熔化，在Pt中浸泡2至72 h坩埚在空气中，然后在水中淬火。另一方面，当样品分别在1608和1678 K熔化时，Fe3 +离子的配位结构通过在四面体和八面体位点之间共享而花费了20和6小时。假定液体中的配位由氧离子的重排决定。随着温度的升高，四面体对称的Fe3 +离子相对于总Fe3 +离子的比例降低。 Fe3 +离子在配位结构中发生变化的反应标准焓变为68.6 +/- 17.3 K / mol（-1）。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：22]

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