NASICON类固溶体的形成和稳定

• 作 者: 田顺宝 林祖纕
• 机 构: 中国科学院上海硅酸盐研究所,中国科学院上海硅酸盐研究所 上海,上海
• 出 处: 化学学报
• 发表日期: 1989年11期
• 关键词: 固相反应法 NASICON 方相 二价离子 结晶化学 离子导体 高温相 晶胞体积 三价 晶胞参数

用固相反应法合成了NASICON固溶体Na_(1+x)Zr_(2+x)M_x(PO_4)_3(M=Y、Yb或In)。测定了晶胞参数随着取代量x的变化,并从结构和结晶化学的角度进行解释。用三价离子Y~(3+)、Yb(3+)、In~(3+)或二价离子Mg~(2+)作为结晶化学稳定剂取代Na_3Zr_2Si_2PO_(12)中的Zr~(4+)离子能生成固溶体,并把NASICON的高温三方相(空间群R3c)稳定在室温,阻止了在150℃左右时单斜?三方的相转变。总结了高温相稳定在低温的条件。

The NASICON solid solution Na 1 + x Zr 2 + x M_x PO_4 (M = Y, Yb or In) was synthesized by the solid state reaction method. The change of unit cell parameters with the amount x of substitution was measured and explained from the structural and crystallographic point of view. In this paper, Zr ~ (4+) ions in Na_3Zr_2Si_2PO_ (12) were replaced by trivalent ions Y ~ (3 +), Yb (3 +), In ~ (3+) or divalent ions Mg ~ (2+) ) Ions can form solid solutions and stabilize NASICON’s high temperature tripartite (space group R3c) at room temperature, preventing monoclinic-trigonal phase transitions at around 150 ° C. The conditions of high temperature stable at low temperature are summarized.