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EPR lineshape studies of low-temperature vanadium 3d1 polaron dynamics in the 70V2O5-30P2O5 binary glass

✍ Scribed by P. Raghunathan; B.B. Das

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 366 KB
Volume: 160
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(89)80076-4

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✦ Synopsis

In a specimen of 70V,0s-3OP,Or glass, EPR lineshapes of the vanadium 3d' polaron have been studied between 4 and 77 K.

At the lowest temperature the unpaired electron is localized at a single "V site, and values ofg,, = 1.959, g, = 1.989, A, = 156.6 x 1 0m4 cm-' and Al =53.8x 10s4 cm-' have been measured. A Markovian small-step rotational diffusion model consistent with the random structure of the glass network is proposed for the polaron dynamics at the higher temperatures up to 77 K. This motion has a small activation energy barrier of 114 peV.

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