High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[ZrxTi1-x]O-3 ferroelectrics
| Autor: | Hrvoje Meštrić, Hans Kungl, Andrew Ozarowski, Klaus-Peter Dinse, Michael J. Hoffmann, Louis Claude Brunel, Johan van Tol, Rüdiger-A. Eichel |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Mesoscopic physics
Phase boundary Chemistry PbTiO3 single-crystals electron-spin-resonance lead titanate ceramics ESR phase valence glasses ions Cr3+ chemistry.chemical_element Mineralogy General Chemistry Lead zirconate titanate Copper Acceptor law.invention chemistry.chemical_compound Crystallography Paramagnetism law General Materials Science Crystallite Electron paramagnetic resonance |
| Popis: | Copper(II)- and iron(III)-modified Pb[Zr(x)Ti(1-x)]O3 ferroelectrics were investigated by means of high-field/high-frequency EPR. The results obtained suggest that Cu2+ and Fe3+ both substitute as acceptor centers for [Zr,Ti]4+. Whereas for the iron-doped system the charge compensating oxygen vacancies (V(O)**) lead to the formation of charged (Fe'(Ti-)V(O)**)* defect associates, no such associates have been observed for the copper-modified system. As regards the morphotropic phase boundary, the model of a mesoscopic mixing of the pure-member phases has been refined to a picture in which a nanoscale composition distribution prevails. |
| Databáze: | OpenAIRE |
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