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Structure, Ionic Conduction and Dielectric Relaxation in a Novel Fast Ion Conductor, $Na_2Cd(SO4_)_2$

Swain, Diptikanta and Guru Row, Tayur N (2007) Structure, Ionic Conduction and Dielectric Relaxation in a Novel Fast Ion Conductor, $Na_2Cd(SO4_)_2$. In: Chemistry of Materials, 19 (3). pp. 347-349.

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Solid electrolytes (fast ion conductors) are a class of materials that exhibits high ionic conductivity at relatively (approximately $10^{-3}$ to $10^{-1} S/cm$) modest (500-700 °C) temperatures. In recent times, microporous materials have been used to mobilize extra framework cations and thus induce high ionic conductivity. Extensive research on crystalline solid electrolytes like, for example, Nasicon and Lisicon, Bimivox, and rock salts has resulted in generating several potential ionic conductors. The ions that normally conduct are $Li^+, Na^+, H^+, K^+, Ag^+, O^{2-}$, and $F^-$. Room temperature conductivity of 0.3 S/cm has been observed in Ag and Cu halide systems. Further binary lithium halide systems (for example, LiI-RbI) have been investigated for high ionic conductivity. We have been interested in bimetallic sulfates as possible ionic conducting materials, and a novel structural type represented by the compound $Na_2Cd(SO_4)_2$ has been synthesized and characterized by single-crystal X-ray diffraction. Furthermore, the compound displays high ionic conductivity $(6.1\times 10^{-2} S/cm$ at 600 °C). In this communication, we report the features of this structure, the ionic conductivity behavior with temperature, and its correlation with dielectric relaxation and differential thermal analysis.

Item Type: Journal Article
Publication: Chemistry of Materials
Publisher: American Chemical Society(ACS)
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 29 Jun 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ac.in/id/eprint/10127

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