Maqola

A structural basis for ionic diffusion in oxide glasses

G. N. Greavesa Daresbury Laboratory, Science and Engineering Research Council , Warrington , WA44AD , EnglandS. J. Gurmanb Department of Physics , University of Leicester , Leicester , LE17RH , EnglandC. Richard A. Catlowc Davy Faraday Research Laboratory, The Royal Institution , 21 Albemarle Street, London , W1X , EnglandA. V. Chadwickd University Chemical Laboratory, University of Kent , Canterbury , CT2 7NH , EnglandS. N. Houde-Waltere Institute of Optics, University of Rochester , New York , 14627 , USAC. M. B. Hendersonf Department of Geology , University of Manchester , Manchester , M13 9PL , EnglandB. R. Dobsona Daresbury Laboratory, Science and Engineering Research Council , Warrington , WA44AD , England

1991en

ABI

Annotatsiya

The relationships between the environments of cations in alkali silicates measured by X-ray absorption fine structure (XAFS) and magic angle spinning nuclear magnetic resonance (MASNMR) are considered. Both are consistent with the modified random network for glass structure in which modifiers form channels percolating through the network. It is proposed that the mechanisms determining the distribution of bridging and non-bridging oxygen atoms at the glass transition are the same as those that promote ionic transport at lower temperatures in the glass. In particular the results of XAFS and MASNMR can be used to predict the activation energy for ionic transport and the magnitude of the electrical conductivity. Values of these parameters for alkali disilicates are in good agreement with those measured directly from transport properties.

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Identifikatorlar

DOI: 10.1080/01418619108204878

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