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Title: Electron paramagnetic resonance studies of beta-alumina, a prototype glass

Abstract

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 + center, the electron spin relaxation rate is measured over the range 2 -20 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 inducedmore » 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.« less

Authors:
 [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics
Publication Date:
Research Org.:
Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
5259489
Report Number(s):
DOE/ER/01198-134; DOE/ER/01198-1321
DOE Contract Number:
AC02-76ER01198
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; CRYSTAL STRUCTURE; F CENTERS; PHYSICAL PROPERTIES; GLASS; SODIUM; POTASSIUM; LITHIUM; ELECTRON SPIN RESONANCE; ELECTRONS; PHYSICAL RADIATION EFFECTS; ALKALI METALS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; COLOR CENTERS; CRYSTAL DEFECTS; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; LEPTONS; MAGNETIC RESONANCE; METALS; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; RADIATION EFFECTS; RESONANCE; VACANCIES; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Kurtz, Steven Ross. Electron paramagnetic resonance studies of beta-alumina, a prototype glass. United States: N. p., 1980. Web. doi:10.2172/5259489.
Kurtz, Steven Ross. Electron paramagnetic resonance studies of beta-alumina, a prototype glass. United States. doi:10.2172/5259489.
Kurtz, Steven Ross. Tue . "Electron paramagnetic resonance studies of beta-alumina, a prototype glass". United States. doi:10.2172/5259489. https://www.osti.gov/servlets/purl/5259489.
@article{osti_5259489,
title = {Electron paramagnetic resonance studies of beta-alumina, a prototype glass},
author = {Kurtz, Steven Ross},
abstractNote = {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+ center, the electron spin relaxation rate is measured over the range 2 -20 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.},
doi = {10.2172/5259489},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1980},
month = {Tue Jan 01 00:00:00 EST 1980}
}

Thesis/Dissertation:
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