Local symmetry-reduction in tetragonal (La,Fe)-codoped Pb Zr0.4Ti0.6O3 piezoelectric ceramics
Ferroelectric Pb Zr0.4Ti0.6O3 ceramics codoped with La3+ and Fe3+ at dopant concentrations of 1.0 and 0.5mol. ％, 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 (FeZr,Ti-V●●,o)● 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 (FeZr,Ti-V●●,o)● defect dipole with respect to the orientation of spontaneous polarization is responsible for a (FeZr,Ti-V●●,o)● center of tetragonal and a different center of rhombic local site symmetry.
Emre Erdem Rüdiger-A Eichel Hans Kungl Michael J Hoffmann Andrew Ozarowski Hans van Tol Louis Claude Brunel
Eduard-Zintl-Institut, Technische Universitait Darmstadt, D-64287 Darmstadt, Germany Institute of Ceramics in Mechanical Engineering, University of Karlsruhe, D-76131 Karlsruhe, Germany Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida St
国际会议
第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)
杭州
英文
12-16
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）