Alkali Tungstates: Stability Relations in the Systems A2O WO3‐WO3
Alkali Tungstates: Stability Relations in the Systems A2O WO3‐WO3
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DOI：
10.1111/j.1151-2916.1975.tb11472.x
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发表时间：
1975-07
影响因子：
3.9
通讯作者：
Luke L. Y. Chang;S. Sachdev
中科院分区：
文献类型：
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作者：
Luke L. Y. Chang;S. Sachdev
在600°~1100°C范围内，研究了碱性单钨酸盐-三氧化钨体系的相关系。在Li体系中，A2O/WO_3比为1：2和1：4的化合物在745°C和805°C时分别是稳定的和不一致熔化的。在Na系中，1：2化合物在746℃时熔化一致，而另外两种钨酸钠(1：4和1：6)分别在835℃和913℃时不一致熔化。K系包括1：2、1：3、1：4和1：6的化合物，它们分别在684°、842°、912°和964°C不一致地熔化。在这些体系中，1：L和1：2化合物的共晶点分别为692℃和56mol%WO_3,622℃和56.3mol%WO_3,633℃和63mol%WO_3。在Rb和Cs体系中，1：2和1：3化合物形成完整的固溶体系列，其熔化温度分别从690°C和732°C升高到868℃和902℃。1：6化合物在这两个体系中也是稳定的，在1040℃和1046℃时熔化不一致。
Phase relations in the systems alkali monotungstate-tungsten trioxide were investigated in the range 600° to 1100°C.In the Li system, compounds with an A2O/WO3 ratio of 1:2 and 1:4 are stable and melt incongruently at 745° and 805°C, respectively. In the Na system, the 1:2 compound melts congruently at 746°C, whereas the other 2 sodium tungstates (1:4 and 1:6) melt incongruently at 835° and 913°C, respectively. The K system includes compounds of 1:2, 1:3, 1:4, and 1:6 which melt incongruently at 684°, 842°, 912°, and 964°C, respectively. Eutectic points between the 1:l and 1:2 compounds in these respective systems are at 692°C and 56 mol%WO3, 622°C and 56.3 mol% WO3, and 633°C and 63 mol%WO3. In the Rb and Cs systems, the 1:2 and 1:3 compounds form complete solid-solution series, and their melting temperatures increase with increasing WO3 content, respectively, from 690° to 868°C and from 732° to 902°C. The 1:6 compounds are also stable in these systems and melt incongruently at 1040° and 1046°C, respectively.