High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[ZrxTi1−x]O3 ferroelectrics
✍ Scribed by Rüdiger-A. Eichel; Hrvoje Meštrić; Klaus-Peter Dinse; Andrew Ozarowski; Johan van Tol; Louis Claude Brunel; Hans Kungl; Michael J. Hoffmann
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 521 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1696
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✦ Synopsis
Copper(II)-and iron(III)-modified Pb[Zr x Ti 1-x ]O 3 ferroelectrics were investigated by means of highfield/high-frequency EPR. The results obtained suggest that Cu 2+ and Fe 3+ 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.