Jermy, M.C. and Greaves, G.N. and Smith, M.E. and Bushnell-Wye, G. and Hannon, A.C. and McGreevy, R.L. and Derst, G. and Tilley, B. (1995) Evidence for the compensated continuous random network model for spodumene glass and analogues. In: Cernik, R.J. and Delhez, R. and Mittemeijer, E.J., eds. Materials science forum. Transtec Publications Ltd pp. 537-542. ISBN 0-87849-742-0.
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We have combined X-ray and neutron scattering with solid state nuclear magnetic resonance (NMR) measurements on glasses of the spodumene and analogous compositions. These glasses LiAlSi2O6, NaAlSiO6 and KAlSi2O6 are fully compensated i.e. contain equal quantities of alkali and aluminium. Q-space and R-space representations for each probe suggest considerable similarity with the structure of silica and point to the crystalline analogue of P-spodumene, which has a stuffed quartz structure. Preliminary Reverse Monte Carlo (RMC) simulations have been made starting from a fully polymerised silica network model. Solid state Magic Angle Spinning NMR reveals that all aluminium retains tetrahedral coordination. This is indicative of fully compensated continuous random network (CCRN) structures for each glass. The chemical shift of Na-23 in NaAlSi2O6 glass indicates that sodium is associated with (AlO4)(-) tetrahedra. At the same time nearest neighbour oxygen distances from neutron scattering increase with size of alkali, suggesting reduction in charge transfer with alkali size together with the possibility of alkali clustering.
|Item Type:||Conference or workshop item (Paper)|
|Additional information:||4th European Powder Diffraction Conference (EPDIC IV) CHESTER, ENGLAND, JUL, 1995 Philips Anal X Ray; CLRC Daresbury Lab|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||R.F. Xu|
|Date Deposited:||04 Jun 2009 16:08|
|Last Modified:||09 May 2012 09:31|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/19266 (The current URI for this page, for reference purposes)|
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