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Al coordination in bulk $Al_{x}Te_{1-x}$ glasses from solid-state NMR

Murugavel, S and Asokan, S (1998) Al coordination in bulk $Al_{x}Te_{1-x}$ glasses from solid-state NMR. In: Physical Review B, 57 (1). pp. 33-36.

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Abstract

Magic-angle-spinning NMR spectroscopic studies (Al-27) have been undertaken to probe the local structure of Al in Al-Te glasses and stoichiometric and nonstoichiometric crystalline Al-Te samples. The chemical-shift values obtained Clearly indicate that there are two different Al environments in Al-Te glasses, corresponding to fourfold and sixfold coordinated Al. The relative proportions of the two sites vary with the composition. Though known to occur in oxide glasses, the sixfold coordination of Al has been found for the first time to our knowledge in the present study in a nonoxide, chalcogenide glass. In stoichiometric crystalline composition, only an octahedral coordination (hexagonal structure) is found, where as the nonstoichiometric crystalline sample obtained by crystallizing the glass contains both sixfold and fourfold coordinated Al.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 17 Feb 2009 05:56
Last Modified: 19 Sep 2010 04:59
URI: http://eprints.iisc.ernet.in/id/eprint/17910

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