Bulk and grain boundary ionic conduction in lithium rare earth-silicates ''LiLnSiO(4)'' (Ln=La, Nd, Sm, Eu, Gd, Dy)

被引：38

作者：

Sato, M ^{[1
]}

Kono, Y ^{[1
]}

Ueda, H ^{[1
]}

Uematsu, K ^{[1
]}

Toda, K ^{[1
]}

机构：

[1] NIIGATA UNIV,GRAD SCH SCI & TECHNOL,DEPT ACT MAT CHEM,NIIGATA 95021,JAPAN

来源：

SOLID STATE IONICS | 1996年 / 83卷 / 3-4期

关键词：

ionic conductivity - lithium; NASICON; silicate; rare earth oxide;

D O I：

10.1016/0167-2738(95)00240-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The lithium rare earth silicates of nominal composition ''LiLnSiO(4)'' (Ln = La, Nd, Sm, Eu, Gd, Dy) have been synthesized. The lithium ion conductivity of their sintered samples was found to consist of two contributions; one is the gain boundary composed possibly of lithium silicate amorphous phases and the other the bulk phase with an apatite structure. Although the conductivity of the bulk phase was smaller than that of the grain boundary, it was apparently increased by several orders of magnitude than that of stoichiometric apatites of Li(x)Ln(10-x)Si(6)O(24)O(3-x) with x=2 and x=3. From the structure refinement of the bulk phase, this enhancement in the conductivity of the apatite phase in LiLnSiO(4) was reasonably interpreted by the model where lithium ions and vacancies were both partially introduced to the 4f site of the apatite structure.

引用

页码：249 / 256

页数：8

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