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Studies on Ion Conducting Compounds with Cristobalite Related Structures.

Published online by Cambridge University Press:  28 February 2011

Jekabs Grins ,
S. Frostäng  and
M. Nygren
Jekabs Grins
Affiliation:
Department of Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm, S—106 91 Stockholm, Sweden
S. Frostäng
Affiliation:
Department of Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm, S—106 91 Stockholm, Sweden
M. Nygren
Affiliation:
Department of Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm, S—106 91 Stockholm, Sweden
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Abstract

This article summarises ionic conductivity and structural studies in the sodium—ion conducting systems NaxM'x/2M'' 2-x/2O4, 2 ≥ x ≥ 4/3 and (M',M'')(Zn,Si), (Be,Si) and (Zn,Ge). The best conductors are found at x ≈ 1.75–1.85, with conductivities in the range 10-2–10-3 (Ωcm)-1 at 600 K. They exhibit stuffed cristobalite type structures, isotypic with the structure of orthorhombic Na2BeSiO4. Based on single crystal data, the Na2BeSiO4 structure has been determined and refined, bothat 295 and 623 K. The structures of several other isotypic compounds have been refined by the Rietveld method, including Na1.8(Zn0.8.Ga0.2)MO4 with M = Si,Ge and Nal.8 Be0.8Si1.1O4. The ionic conductivity properties of the materials are discussed in relation to the obtained structural data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 657
Copyright
Copyright © Materials Research Society 1991

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