Examination of the Mixed-Alkali Effect in(LI,NA) Disilicate Glasses by Nuclear-Magnetic-Resonance and Conductivity Measurements

Ali, Fatima and Chadwick, Alan V. and Greaves, G.N. and Jermy, M.C. and Ngai, K.L. and Smith, Mark E. (1995) Examination of the Mixed-Alkali Effect in(LI,NA) Disilicate Glasses by Nuclear-Magnetic-Resonance and Conductivity Measurements. Solid State Nuclear Magnetic Resonance, 5 (1). pp. 133-143. ISSN 0926-2040. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/0926-2040(95)00033-M

Abstract

Results from Si-29, Na-23 and Li-7 magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy, Li-7 NMR relaxation and electrical conductivity in a series of [Li-(1-x). Na-x]O-2 . 2SiO(2) (disilicate) glasses are used to investigate the mixed-alkali effect. From the Si-29 NMR spectra there is relatively little change of the network with alkali composition. Na-23 and Li-7 NMR linewidths and shifts change continuously as a function of composition, indicating that the alkali ions are intimately and uniformly mixed rather than separated into lithium and sodium-rich domains. The activation energy from electrical conductivity shows a distinct maximum at the central composition (x = 0.5), whereas the local activation energy for lithium motion determined from NMR shows only a smaller but monotonic increase as the lithium-content decreases.

Item Type: Article
Uncontrolled keywords: GLASSES; SI-29 NUCLEAR MAGNETIC RESONANCE; NA-23 NUCLEAR MAGNETIC RESONANCE; LI-7 NUCLEAR MAGNETIC RESONANCE; ELECTRICAL CONDUCTIVITY; MAGIC-ANGLE SPINNING; ALKALI DISILICATES; MIXED-ALKALI EFFECT
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: P. Ogbuji
Date Deposited: 09 Jun 2009 09:12
Last Modified: 13 Jun 2014 10:50
Resource URI: http://kar.kent.ac.uk/id/eprint/19663 (The current URI for this page, for reference purposes)
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