Growth of KY(WO4)2 single crystal: investigation of the WO3 rich region in the K2O-Y2O3-WO3 ternary system. 2 — The KY(WO4)2 crystallisation field

European Journal of Solid State and Inorganic Chemistry Pub Date : 1998-06-01 DOI:10.1016/S0992-4361(98)80021-0

E. Gallucci, C. Goutaudier, G. Boulon, M.T. Cohen-Adad

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引用次数: 17

Abstract

In order to determinate the best crystal growth conditions for KY(WO₄)₂ single-crystals, the investigation of the K₂O-Y₂O₃-WO₃ ternary system was undertaken by the study of three isoplethic sections (K₂W₄O₁₃-Y₂O₃, K₂WO₄-KY(WO₄)₂, K₂W₂O₇-KY(WO₄)₂). The stability domain and the crystallisation field of the compound were then defined: KY(WO₄)₂ is not stoichiometric and melts congruently for the composition 0.81(K₂O.4WO₃)−0.19Y₂O₃ The low temperature phase belongs to the monoclinic system (s.g. C2/c) with a=10.65(1)Å, b=10.34(1)Å, c=7.54(1)Å, β=130.5(1)°. Its crystallisation field was delimited in temperature and composition: an α-KY(WO₄)₂ crystal can grow if x_Y2O3≤0.175.

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KY(WO4)2单晶的生长:k20 - y2o3 -WO3三元体系中WO3富集区的研究。2 - KY(WO4)2结晶场

为了确定KY(WO4)2单晶的最佳生长条件，通过对K2W4O13-Y2O3、K2WO4-KY(WO4)2、K2W2O7-KY(WO4)2三个等晶片的研究，对k20 - y2o3 - wo3三元体系进行了研究。确定了该化合物的稳定性域和结晶场:KY(WO4)2不具有化学测量性，在0.81(K2O.4WO3) - 0.19Y2O3的组成下熔体一致，低温相属于单斜晶系(s.g 2/c)， a=10.65(1)Å， b=10.34(1)Å， c=7.54(1)Å， β=130.5(1)°。在温度和组成上划分了结晶场:当xY2O3≤0.175时，可以生长α-KY(WO4)2晶体。

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European Journal of Solid State and Inorganic Chemistry

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