研究论文

钠快离子导体NaLaS2和NaLaS1.5Se0.5的合成及表征

  • 孙军康 ,
  • 黄富强 ,
  • 杨建华 ,
  • 刘战强
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  • 中国科学院 上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室, 上海 200050

收稿日期: 2007-04-23

  修回日期: 2007-08-13

  网络出版日期: 2008-03-20

Synthesis and Characterization of NaLaS2 and NaLaS1.5Se0.5 Sodium Fast Ionic Conductors

  • SUN Jun-Kang ,
  • HUANG Fu-Qiang ,
  • YANG Jian-Hua ,
  • LIU Zhan-Qiang
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  • State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received date: 2007-04-23

  Revised date: 2007-08-13

  Online published: 2008-03-20

摘要

以Na2S、La和S或Se为原料在750℃下固相反应合成新型钠快离子导体NaLaS2和NaLaS 2. X射线衍射分析表明, NaLaS2 和NaLaS1.5Se0.5具有相同的晶体结构, 其空间群为FM3-M. 通过在0.1Hz~100kHz的频率范围交流阻抗谱的测试, 分析了这些快离子导体的离子导电性, 发现在相同的温度下NaLaS1.5Se0.5的电导率高于NaLaS2. NaLaS2在30和90℃时的电导率分别为3.65×10-5 和6.23×10-5S·cm-1, 而NaLaS1.5Se0.5在30和60℃时的电导率分别为8.11×10-5和1.37×10-4S·cm-1. 通过对合成物晶体结构的分析, 推测这两种化合物的导电率差异可能来自于Se2-离子较高的极化能力, 以及离子半径较大的Se2-引起的局部晶格扩大.

本文引用格式

孙军康 , 黄富强 , 杨建华 , 刘战强 . 钠快离子导体NaLaS2和NaLaS1.5Se0.5的合成及表征[J]. 无机材料学报, 2008 , 23(2) : 301 -304 . DOI: 10.3724/SP.J.1077.2008.00301

Abstract

sodium fast ion conductors of NaLaS2 and NaLaS1.5Se0.5 were prepared by high temperature solid state reaction at 750℃. 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. NaLaS 2 shows conductivity of 3.65×10-5S·cm-1 at 30℃ and 6.23×10-5S·cm-1 at 90℃, respectively; while NaLaS1.5Se0.5 displays higher conductivity of 8.11×10-5S·cm-1 at 30℃ and 1.37×10-4S·cm-1 at 60℃, respectively. This is probably due to the stronger polarization power of Se2--, the larger radius of Se2-, and subsequently the enlargement of local lattice.

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