LiZnPO_4-LnPO_4体系离子导电性的研究

Ionic conductivity of LiZnPO 4-LnPO 4 system

采用柠檬酸盐溶胶 -凝胶法制备了低温相α -LiZnPO4 和以LiZnPO4 为基质稀土磷酸盐 (LnPO4 )掺杂的 (LiZnPO4 ) 1-x- (LnPO4 ) x(Ln3+=Nd3 +、Sm3 +、Er3+、X =0 .1;Ln3 +=La3+,X =0 .1、0 .2、0 .4、0 .6 )的超细粉体并对它们进行DTA、TG和XRD的表征 .讨论了室温下不同比例、不同稀土磷酸盐的掺杂对基质LiZnPO4 离子导电率的影响 .测试结果表明 ,LiZnPO4 -LnPO4 体系是由α -LiZnPO4 和LnPO4 两相组成 ;由于α -LiZnPO4 烧结体的相对密度 (d =5 8)极小 ,室温下样品几乎不显示导电性 ,而适量的非导电相LnPO4的掺入有助于提高烧结体的相对密度 。

Studies the sinters of α-LiZnPo 4(low temperature phase) and LiZnPO 4LnPo 4(Ln 3+ =La 3+ ,Nd 3+ ,Sm 3+ 、Er 3+ ) based on LiZnPO 4 were prepared by critrate sol gel method, and their phase, densification of sintered pellets, and ionic conductivity and concludes from the results that α-LiZnPO 4 does not have the ionic conductivity at room temperature because of the very small relative densification of α-LiZnPO 4 sintered pellet; Ionic conductivity of the LiZnPO 4-LnPO 4 increases in which Zn 2+ is not replaced by Ln 3+ but a glassy second phase forms at the grain boundaries, which increases the relatively densification of the ceramic and the grain boundary ionic conductivity.