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Electron paramagnetic resonance studies of beta-alumina, a prototype glass [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 145 : digital, PDF file
Additional Creators:
United States. Department of Energy. Office of Energy Research and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Electron paramagnetic resonance techniques are used to study single crystal Na, K, and Li beta-alumina. Color centers are introduced into this material by irradiating the samples with electrons at liquid nitrogen temperature. Using electron paramagnetic resonance and electron nuclear double resonance, the color centers generated in this manner are identified, and their location within the material is determined. For one of these centers, an F/sup +/ center, the electron spin relaxation rate is measured over the range 2 to 20/sup 0/K using the pulse saturation and recovery technique. These measurements reveal an exceptionally fast relaxation rate with anomalous temperature and microwave frequency dependence. Beta-alumina is a structurally unique system. It is partially disordered and consists of ordered blocks of aluminum oxide separated by planar disordered regions. Extensive measurements have shown that beta-alumina displays properties identical to those observed for glasses at low temperature as a result of this limited structural disorder. These glass-like properties have been explained by proposing that atomic tunneling occurs in beta-alumina at low temperature producing a system of localized two level states. A model is developed which quantitatively describes the electron spin relaxation data. The proposed relaxation mechanism couples the color center spin to the phonon induced relaxation of a nearby localized two level tunneling state. A detailed comparison shows that this model is in good agreement with earlier heat capacity, thermal conductivity, and dielectric susceptibility measurements in beta-alumina.
Report Numbers:
E 1.99:doe/er/01198--134
E 1.99: doe/er/01198--1321
doe/er/01198--1321
doe/er/01198--134
Subject(s):
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Dissertation Note:
Thesis
Note:
Published through SciTech Connect.
01/01/1980.
"doe/er/01198--134"
" doe/er/01198--1321"
Kurtz, Steven Ross.
Illinois Univ., Champaign (United States). Physics Research Lab.
Funding Information:
AC02-76ER01198
View MARC record | catkey: 14461694