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

Ali, Fatima, Chadwick, Alan V., Greaves, G.N., Jermy, M.C., Ngai, K.L., 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. (doi:10.1016/0926-2040(95)00033-M) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:19663)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
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
DOI/Identification number: 10.1016/0926-2040(95)00033-M
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: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: P. Ogbuji
Date Deposited: 09 Jun 2009 09:12 UTC
Last Modified: 16 Nov 2021 09:57 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/19663 (The current URI for this page, for reference purposes)

University of Kent Author Information

Chadwick, Alan V..

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