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Phase Equilibria in the Ternary Reciprocal System K, Ba||Br, MoO

Inorganic Materials, ISSN: 1608-3172, Vol: 57, Issue: 12, Page: 1264-1270
2021
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The ternary reciprocal system K, Ba||Br, (Formula presented.) has been divided into stable simplexes by a thermodynamic method, stable sections have been identified, and the heat effect of the exchange reaction at the conversion point has been calculated. We have described phase equilibria and chemical interactions in the system and located the primary crystallization fields of the phases involved. To confirm the theoretical division of the system, we experimentally studied two stable sections and three stable elements of the ternary reciprocal system K, Ba||Br, (Formula presented.) by differential thermal analysis. The experimental data demonstrate that the system is singular, irreversibly reciprocal, with eutectic melting behavior. The system is divided by stable diagonal sections into four stable phase triangles: KBr–D–KMoO, KBr–D–BaMoO, KBr–D–BaMoO, and BaBr–D–BaMoO (where D = 2KBr⋅BaBr and D = KMoO.BaMoO). The division results have been confirmed by X-ray diffraction. In the stable sections, we have identified pseudobinary eutectic saddle points: e (727°C) and e (608°C). We have determined the position (melting point and composition) of three ternary eutectic points (E (597°C), E (606°C), and E (602°C)) and a ternary peritectic point (P1, 613°C). The largest primary crystallization field in the composition square is that of barium molybdate, a refractory compound.

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