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Electron spin relaxation of the PO32− radical in ferroelectric betaine phosphite and in the proton glass betaine phosphate/betaine phosphite

✍ Scribed by A. Pöppl; G. Völkel; J. Hoentsch; S. Orlinski; A. Klöpperpieper

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
482 KB
Volume
224
Category
Article
ISSN
0009-2614

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✦ Synopsis

Measurements of the electron spin-lattice relaxation time T, and the phase memory time TM of the PO:-radical in y-irradiated betaine phosphite and betaine phosphate/betaine phosphite are presented. The temperature dependence of T, indicates the interaction of the electron spin with two groups of optical branches via Raman processes in both crystals. An additional relaxation path due to the interaction with two-levei local tunneling states has been observed in the mixed crystal confirming glassy behaviour. The TM temperature dependence reflects thermally activated local motional effects of the PO3 group in both crystals.

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✍ M. N. Ramanuja; K. P. Ramesh; J. Ramakrishna 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 327 KB

## Abstract Proton NMR relaxation measurements have been carried out in the mixed system of antiferroelectric (AFE) betaine phosphate (BP) and ferroelectric (FE) glycine phosphite (GPI), BP~__x__~GPI~(1−__x__)~, at 11.4 and 23.3 MHz from 300 to 100 K for __x__ = 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8. The