Bi_2SiO_5的亚稳定相平衡的研究

STUDY ON THE METASTABLE PHASE EQUILIBRIUM OF Bi2SiO5

通过ＤＴＡ和ＸＲＤ研究了Ｂｉ２Ｏ３－ＳｉＯ２系统及其化合物Ｂｉ２ＳｉＯ５（１∶１相）的亚稳定相平衡，发现亚稳相Ｂｉ２ＳｉＯ５的析晶温度大约为８４５℃．在Ｂｉ２Ｏ３－ＳｉＯ２系统的广泛区域内（ＳｉＯ２摩尔分数大于３０％）熔体冷却时易于自发成核析出Ｂｉ２ＳｉＯ５相，并且该相在进一步冷却时无其它相变产生，直到室温下也可稳定存在．

Metastable phase equilibrium of Bi2O3-SiO2 system and its compound Bi2SiO5 were studied with DTA and XRD. The investigation shows that metastable phase Bi2SiO5 crystallizes at about 845 during cooling. Upon cooling the melt, Bi2SiO5 tends to crystallize by nucleating spontaneously in a wide range of Bi2O3-SiO2 system (more than 30% SiO2, in mole) and can be cooled to room temperature without any phase transition and it will exist stably at room temperature.