Research Paper

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

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.

Cite this article

SUN Jun-Kang , HUANG Fu-Qiang , YANG Jian-Hua , LIU Zhan-Qiang . Synthesis and Characterization of NaLaS2 and NaLaS1.5Se0.5 Sodium Fast Ionic Conductors[J]. Journal of Inorganic Materials, 2008 , 23(2) : 301 -304 . DOI: 10.3724/SP.J.1077.2008.00301

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