Synthesis and characterization of NaLaS2 and NaLaS1.5Se0.5 sodium fast ionic conductors

被引：4

作者：

Jun-Kang, Sun ^{[1
]}

Huang Fu-Qiang ^{[1
]}

Yang Jian-Hua ^{[1
]}

Liu Zhan-Qiang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

来源：

JOURNAL OF INORGANIC MATERIALS | 2008年 / 23卷 / 02期

关键词：

fast ionic conductor; conductivity; activation energy;

D O I：

10.3724/SP.J.1077.2008.00301

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Novel sodium fast ion conductors of NaLaS2 and NaLaS1.5Se0.5 were prepared by high temperature solid state reaction at 750 degrees C. X-ray powder diffraction analysis confirms that NaLaS1.5Se0.5 is isostructural to NaLaS2 and NaLaSe2 (space group FM3-M). Their ionic conductive properties were investigated by AC impedance spectroscopy in the frequency range of 0.1Hz-100kHz at different temperatures. The conductivity of NaLaS1.5Se0.5 is higher than that of NaLaS2 at the same temperature. NaLaS2 shows conductivity of 3.65x10(-5)S.cm(-1) at 30 degrees C and 6.23x10(-5)S.cm(-1) at 90 degrees C, respectively; while NaLaS1.5Se0.5 displays higher conductivity of 8.11 x 10(-5)S.cm(-1) at 30 degrees C and 1.37x 10(-4)S.cm(-1) at 60 degrees C, respectively. This is probably due to the stronger polarization power of Se2-, the larger radius of Se2-, and subsequently the enlargement of local lattice.

引用

页码：301 / 304

页数：4

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