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用X射线衍射和差热分析方法研究了BaB_2O_4-K_2O和BaB_2O_4-K_2B_2O_4赝二元系的相平衡关系。BaB_2O_4-K_2B_2O_4属共晶体系,共晶温度为850±3℃,共晶点成分为45mol％K_2O。在BaB_2O_4-K_2O赝二元系中,一新化合物5BaB_2O_4·3K_2O在903±3℃同成份熔化,它与BaB_2O_4形成共晶体系,共晶温度为813±3℃,共晶点成分为25mol％ K_2O。另一新化合物在860±3℃由包晶反应形成,并与K_2O形成共晶体系,共晶温度为788±3℃,共晶点成分约为67.5mol％K_2O。
The phase equilibrium of BaB_2O_4-K_2O and BaB_2O_4-K_2B_2O_4 pseudobinary systems was studied by X-ray diffraction and differential thermal analysis. BaB_2O_4-K_2B_2O_4 belongs to the eutectic system with the eutectic temperature of 850 ± 3 ℃ and the eutectic composition of 45mol% K_2O. In BaB_2O_4-K_2O pseudo-binary system, a new compound 5BaB_2O_4 · 3K_2O melts at 903 ± 3 ℃ with the same composition, which forms a eutectic system with BaB_2O_4, the eutectic temperature is 813 ± 3 ℃ and the eutectic composition is 25mol% K_2O . Another new compound was formed by peritectic reaction at 860 ± 3 ℃ and formed a co-crystal system with K_2O. The eutectic temperature was 788 ± 3 ℃ and the eutectic point composition was 67.5mol% K_2O.