Abstract
In order to determinate the best crystal growth conditions for KY(WO 4) 2 single-crystals, the investigation of the K 2O-Y 2O 3-WO 3 ternary system was undertaken by the study of three isoplethic sections (K 2W 4O 13-Y 2O 3, K 2WO 4-KY(WO 4) 2, K 2W 2O 7-KY(WO 4) 2). The stability domain and the crystallisation field of the compound were then defined: KY(WO 4) 2 is not stoichiometric and melts congruently for the composition 0.81(K 2O.4WO 3)−0.19Y 2O 3 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(WO 4) 2 crystal can grow if x Y2O3≤0.175.
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