Greaves, G.N. and Gurman, S.J. and Catlow, C.R.A. and Chadwick, A.V. and Houdewalter, S. and Henderson, C.M.B. and Dobson, B.R. (1990) A structural basis for ionic-diffusion in oxide glasses. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties, 64 (5). pp. 1059-1072. ISSN 0141-8610.
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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.
|Additional information:||Document Type: Proceedings Paper Conference Information: CONF ON IONIC TRANSPORT MANSFIELD COLL, OXFORD, ENGLAND, MAR 28-30, 1990 ROYAL SOC CHEM, POLAR SOLIDS DISCUSS GRP|
|Subjects:||Q Science > QD Chemistry
Q Science > QC Physics
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||O.O. Odanye|
|Date Deposited:||21 Oct 2009 09:51|
|Last Modified:||21 Oct 2009 09:52|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/22957 (The current URI for this page, for reference purposes)|
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