Erdem, Emre ; Jakes, Peter ; Parashar, S. K. S. ; Kiraz, Kamil ; Somer, Mehmet ; Rüdiger, Andreas ; Eichel, Rüdiger-A. (2010)
Defect structure in aliovalently-doped and isovalently-substituted PbTiO3nano-powders.
In: Journal of Physics: Condensed Matter, 22 (34)
doi: 10.1088/0953-8984/22/34/345901
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The defect structure of Fe3 + -, Cu2 + -, Mn4 + - and Gd3 + -doped PbTiO3 nano-powders has been studied by electron paramagnetic resonance (EPR) spectroscopy. Analogous to the situation for 'bulk' ferroelectrics, Fe3 + and Cu2 + act as acceptor-type functional centers that form defect complexes with charge-compensating oxygen vacancies. The corresponding defect dipoles are aligned along the direction of spontaneous polarization, PS, and possess an additional defect polarization, PD. Upon the transition to the nano-regime, the defect structure is modified such that orientations perpendicular to PS, (FeTi'–V0°°)°_ and (Cu''Ti-V0°°)_* also become realized. Moreover, the binding energy for the defect complexes is lowered such that instead 'free' FeTi' and V0°°-centers are formed. As a consequence, the concentration of mobile V0°° that enhances the ionic conductivity through drift diffusion is increased for the nano-powders. Finally, in the nano-regime the ferroelectric 'hardening' is expected to be considerably decreased as compared to the 'bulk' compounds. In contrast to the acceptor-type dopants, the donor-type Gd3 + dopant is incorporated as an 'isolated' functional center, where charge compensation by means of lead vacancies is performed in distant coordination spheres.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2010 |
| Autor(en): | Erdem, Emre ; Jakes, Peter ; Parashar, S. K. S. ; Kiraz, Kamil ; Somer, Mehmet ; Rüdiger, Andreas ; Eichel, Rüdiger-A. |
| Art des Eintrags: | Bibliographie |
| Titel: | Defect structure in aliovalently-doped and isovalently-substituted PbTiO3nano-powders |
| Sprache: | Englisch |
| Publikationsjahr: | September 2010 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Condensed Matter |
| Jahrgang/Volume einer Zeitschrift: | 22 |
| (Heft-)Nummer: | 34 |
| DOI: | 10.1088/0953-8984/22/34/345901 |
| Kurzbeschreibung (Abstract): | The defect structure of Fe3 + -, Cu2 + -, Mn4 + - and Gd3 + -doped PbTiO3 nano-powders has been studied by electron paramagnetic resonance (EPR) spectroscopy. Analogous to the situation for 'bulk' ferroelectrics, Fe3 + and Cu2 + act as acceptor-type functional centers that form defect complexes with charge-compensating oxygen vacancies. The corresponding defect dipoles are aligned along the direction of spontaneous polarization, PS, and possess an additional defect polarization, PD. Upon the transition to the nano-regime, the defect structure is modified such that orientations perpendicular to PS, (FeTi'–V0°°)°_ and (Cu''Ti-V0°°)_* also become realized. Moreover, the binding energy for the defect complexes is lowered such that instead 'free' FeTi' and V0°°-centers are formed. As a consequence, the concentration of mobile V0°° that enhances the ionic conductivity through drift diffusion is increased for the nano-powders. Finally, in the nano-regime the ferroelectric 'hardening' is expected to be considerably decreased as compared to the 'bulk' compounds. In contrast to the acceptor-type dopants, the donor-type Gd3 + dopant is incorporated as an 'isolated' functional center, where charge compensation by means of lead vacancies is performed in distant coordination spheres. |
| Zusätzliche Informationen: | SFB 595 B1 |
| Fachbereich(e)/-gebiet(e): | DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung > Teilprojekt B1: EPR Untersuchung von Defekten in ferroelektrischen keramischen Werkstoffen |
| Hinterlegungsdatum: | 08 Aug 2011 09:20 |
| Letzte Änderung: | 14 Jan 2019 14:27 |
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