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27 Al MAS NMR investigations on Al 23 Te 77 glass: Observation of 5- coordinated Al and its influence on electrical switching

Wilson, PT and Chahal, S and Pumlianmunga, B and Madesh Kumar, M and Ramesh, K (2019) 27 Al MAS NMR investigations on Al 23 Te 77 glass: Observation of 5- coordinated Al and its influence on electrical switching. In: Solid State Communications, 293 . pp. 53-57.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2019.02.007

Abstract

27 Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopic studies show that Al resides in 4-, 5- and 6- fold coordination in bulk Al 23 Te 77 glass. Also, Al 23 Te 77 glass is found to exhibit threshold type switching. Earlier studies report memory type switching in Al-Te glasses wherein Al has been found only in 4 Al and 6 Al environments. X-Ray Photo Electron Spectroscopic (XPS) measurements show the presence of Al 2 O 3 in Al 23 Te 77 glass network. The structural network of Al-Te glass has been cross linked by the presence of higher coordinated Al atoms. The structural reorganization becomes difficult due to the increased network connectivity. Thus, the memory switching (which requires an easy structural reorganization) is retarded, resulting in the observation of threshold switching. © 2019

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 29 Mar 2019 12:45
Last Modified: 29 Mar 2019 12:45
URI: http://eprints.iisc.ac.in/id/eprint/61992

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