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Local structure in $Al_20 As_x Te_{80-x}$ glasses revealed by NMR, x-ray and thermal investigations

Murugavel, S and Asokan, S (2002) Local structure in $Al_20 As_x Te_{80-x}$ glasses revealed by NMR, x-ray and thermal investigations. In: Physics and Chemistry of Glasses, 43 (1). pp. 16-19.

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Abstract

The coordination environment of aluminium in $Al_20 As_x Te_{80-x}$glasses has been probed by solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Differential scanning calorimetry and x-ray diffraction are used to study the thermal crystallisation behaviour. It is found that in $Al_20 As_x Te_{80-x}$glasses, Al is both tetrahedrally and octahedrally coordinated with arsenic or tellurium. Based on these studies it is proposed that the local structure in $Al_20 As_x Te_{80-x}$ glasses is characterised by As-Te, $[Al-Te(As)]_6$ and $[Al-Te(As)]_4$ structural units. The compositional dependence of the above structural species is found to determine the structural order in these glasses.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Society of Glass Technology.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 02 Jun 2006
Last Modified: 27 Aug 2008 12:09
URI: http://eprints.iisc.ernet.in/id/eprint/7425

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