title: High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[Zr(x)Ti(1-x)]O3 ferroelectrics.
abstract: 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.
authors.affiliation: Eduard-Zintl-Institute, Darmstadt University of Technology, D-64287 Darmstadt, Germany. eichel@chemie.tu-darmstadt.de
authors.forename: Rüdiger-A
authors.initials: RA
authors.lastname: Eichel
authors.forename: Hrvoje
authors.initials: H
authors.lastname: Mestrić
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Dinse
authors.forename: Andrew
authors.initials: A
authors.lastname: Ozarowski
authors.forename: Johan
authors.initials: J
authors.lastname: van Tol
authors.forename: Louis Claude
authors.initials: LC
authors.lastname: Brunel
authors.forename: Hans
authors.initials: H
authors.lastname: Kungl
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Hoffmann