Local symmetry-reduction in tetragonal (La,Fe)-codoped Pb[Zr0.4Ti0.6]O3piezoelectric ceramics
| Autor: | Emre Erdem, Hans van Tol, Andrew Ozarowski, Ruediger-A. Eichel, Hans Kungl, Michael J. Hoffmann, Louis Claude Brunel |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Dopant Condensed matter physics Crystal structure Condensed Matter Physics Acceptor Ferroelectricity Crystallographic defect Atomic and Molecular Physics and Optics law.invention Crystallography Tetragonal crystal system law Local symmetry Electron paramagnetic resonance Mathematical Physics |
| Zdroj: | Physica Scripta. :12-16 |
| ISSN: | 1402-4896 0031-8949 |
| DOI: | 10.1088/0031-8949/2007/t129/003 |
| Popis: | Ferroelectric 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. |
| Databáze: | OpenAIRE |
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