Emre Erdem et al 2007 Phys. Scr. 2007 12 doi:10.1088/0031-8949/2007/T129/003
Emre Erdem1, Rüdiger-A Eichel1, Hans Kungl2, Michael J Hoffmann2, Andrew Ozarowski3, Hans van Tol3 and Louis Claude Brunel3
Show affiliationsFerroelectric Pb[Zr0.4Ti0.6]O3 ceramics codoped with La3+ and Fe3+ at dopant concentrations of 1.0 and 0.5 mol. %, respectively, were investigated by means of multifrequency electron paramagnetic resonance (EPR) spectroscopy. The results prove that iron is incorporated at the [Zr,Ti]-site, acts as an acceptor and favors the creation of charged (Fe ' Zr, Ti- VO••)• defect dipoles that may give rise to internal bias fields also for 'soft' piezoelectric compounds. In particular, the iron functional center site symmetry was investigated. A multi-site situation was observed in which the orientation of the (Fe ' Zr, Ti- VO••)• defect dipole with respect to the orientation of spontaneous polarization is responsible for a (Fe ' Zr, Ti- VO••)• center of 'tetragonal' and a different center of 'rhombic' local site symmetry.
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
61.72.J- Point defects and defect clusters
76.30.Fc Iron group (3d) ions and impurities (Ti-Cu)
Issue T129 (December 2007)
Received 31 March 2007, accepted for publication 17 August 2007
Published 22 November 2007
Emre Erdem et al 2007 Phys. Scr. 2007 12
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