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KMID : 1059519990430050547
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Journal of the Korean Chemical Society
1999 Volume.43 No. 5 p.547 ~ p.551
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Study on the Crystal Phases of Ca15.-1.5xBixVO4 Compositions by Bi Substitution
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Kim Myung-Seab
Park Sun-Min
Kim Ho-Kun
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Abstract
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The phase change upon Bi substitutions in Ca1.5-1.5xBixVO4 has been systematically studied. The x value corresponding to the maximum Bi substitutions reades to 0.14 and in this range(x≤0.14), the single phasic Ca3(VO4)2 can be identified. However, a new phase of BiV1.025O4+x is apparently formed along with the Ca3(VO4)2 phase, when the x value exceeds beyond 0.18 (x≥0.18). As a result of Bi substitution in the range of x≤0.14, the interplanar space(d300) becomes larger as the Bi content increases. Since the composition of single phasic Ca129Bi0.14VO4 (x=O.14) is, however, incongruent melting one, no definite melting point could be observed. But we found that its solidus temperature was 1182℃ by DTA analysis.
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