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NMR relaxation study of disorder in condensed matter: solid solutions of betaine phosphate and phosphite

Ramanuja, MN and Ramesh, KP and Ramakrishna, J (2006) NMR relaxation study of disorder in condensed matter: solid solutions of betaine phosphate and phosphite. In: Molecular Physics, 104 (20-21). pp. 3213-3223.

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Official URL: http://www.informaworld.com/smpp/content~db=all~co...

Abstract

Proton NMR relaxation measurements have been carried out in anti-ferroelectric Betaine phosphate (BP), ferroelectric Betaine phosphite (BPI) and the mixed system BPI(1-x)BPx, at 11.4MHz and 23.3MHz from 300K to 80K for x=0.0, 0.25, 0.45, 0.85, and 1.0. The temperature dependence of spin lattice relaxation time T, exhibits two minima as expected from the BPP model in BP and BPI. The Larmor frequency dependence of T, in the mixed system is rather unusual and exhibits different slopes for the low temperature wings at the two frequencies, which is a clear experimental evidence of the presence of different methyl groups with different activation energies (E-a) indicating disorder.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Aug 2010 06:50
Last Modified: 25 Aug 2010 06:50
URI: http://eprints.iisc.ernet.in/id/eprint/30580

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