Electronic paramagnetic resonance (EPR) study of the structure of ZnO varistors prepared by various chemical methods

Mn2+ ions in both ZnO lattice and electroconductive phase were used as a sensitive probe for the analyses of structural changes during sintering. Potential mechanisms which can contribute to the formation of resonant lines were considered. The concentration of paramagnetic centres was quantitatively...

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Bibliographic Details
Published in:Journal of materials science 1990, Vol.25 (10), p.4324-4330
Main Authors: VLASOVA, M. V, KAKAZEY, N. G, MILOSEVIC, O, USKOKOVIC, D. P, POLETI, D, VASOVIC, D
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron paramagnetic resonance and relaxation
Exact sciences and technology
Iron group (3d) ions and impurities (ti-cu)
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
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Summary:Mn2+ ions in both ZnO lattice and electroconductive phase were used as a sensitive probe for the analyses of structural changes during sintering. Potential mechanisms which can contribute to the formation of resonant lines were considered. The concentration of paramagnetic centres was quantitatively analysed. The variation of EPR signals of Mn2+ ions in ZnO phase was registered as a function of the chemical methods used for the preparation of powders only when samples were sintered at lower temperatures and non-linear characteristics of varistor ceramics had not yet been reached. At higher sintering temperatures EPR signals of Mn2+ ions in electroconductive phase differed only in powders obtained by NaOH coprecipitation. 18 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00581091