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

doi:10.3724/SP.J.1077.2008.00301

Abstract

Abstract: sodium fast ion conductors of NaLaS₂ and NaLaS_1.5Se_0.5 were prepared by high temperature solid state reaction at 750℃. X-ray powder diffraction analysis confirms that NaLaS_1.5Se_0.5 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 NaLaS_1.5Se_0.5 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 NaLaS_1.5Se_0.5 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 Se^2--, the larger radius of Se^2-, and subsequently the enlargement of local lattice.

Key words: fast ionic conductor, conductivity, activation energy

CLC Number:

TM911

SUN Jun-Kang,HUANG Fu-Qiang,YANG Jian-Hua,LIU Zhan-Qiang. Synthesis and Characterization of NaLaS₂ and NaLaS_1.5Se_0.5 Sodium Fast Ionic Conductors[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00301.

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Synthesis and Characterization of NaLaS₂ and NaLaS_1.5Se_0.5 Sodium Fast Ionic Conductors

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