Bi_2O_3-ZnO-Nb_2O_3(BZN)系复相陶瓷的相转变

PHASE TRANSITION OF Bi_2O_3-ZnO-Nb_2O_3(BZN)_BASED DIPHASIC CERAMICS

重新讨论了ＢＺＮ系（α＋ β） 复相陶瓷中α相与β相之间的相转变． 研究表明：ＢＺＮ系α相与β相是有一定固溶范围的三元化合物，α相的固溶范围受温度的影响较大，β相的固溶范围受温度的影响较小． 复相（α＋ β） 的相组成因此受温度的影响，随温度升高，α相的固溶范围变大，对β相的固溶度增加，复相中β相减少，α相增加． 随温度降低，α相的固溶范围变小，对β相的固溶度减小，β相从α相中脱溶，复相中α相减少，β相增加．

The transition between α phase and β phase in the BZN_based ( α+β ) diphasic ceramics is discussed. The results show that BZN_based α phase and β phase are compounds with certain solid solution limits. Temperature has more strong effect on the solid solution limit of α phase, and less on that of β phase. There is ( α+β )diphasic region between α phase region and β phase region. So temperature will affect the ratio of α / β phase in the ( α+β ) diphasic region. As temperature increased, the amount of α phase increases and β phase decreases, because of the higher solid solution limit of α phase. As temperature decreased, the amount of α phase decreases and β phase increases, because of the β phase precipitating out of α phase due to the less solid solution limit of α phase at lower temperature.