Erdem, Emre ; Kiraz, Kamil ; Somer, Mehmet ; Eichel, Rüdiger-A. (2010)
Size effects in Fe3+-doped PbTiO3 nanocrystals—Formation and orientation of (Fe'Ti-V0°°)° defect-dipoles.
In: Journal of the European Ceramic Society, 30 (2)
doi: 10.1016/j.jeurceramsoc.2009.04.034
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A set of Fe3+-modified PbTiO3 nanopowders has been synthesized according to the combined polymerization and pyrolysis (CPP) route of metallorganic precursors [Erdem E, Böttcher R, Semmelhack H-C, Gläsel H-J, Hartmann E, Hirsch D. Preparation of lead titanate ultrafine powders from combined polymerisation and pyrolysis route. J. Mater. Sci. 2003;38:3211–7] with subsequent calcination at various temperatures. X-ray diffraction verifies the formation of a PbTiO3 perovskitic phase and Raman-spectroscopy proves the existence of ferroelectricity.
Furthermore, the prevailing defect structure has been investigated by means of electron paramagnetic resonance (EPR) spectroscopy. The EPR results clearly indicate marked size effects by approaching to the critical grain size (dcrit<12 nm) at which a size-driven tetragonal-to-cubic phase transition is observed at room temperature. As a function of mean grain size, either (Fe'Ti-V0°°)° defect dipoles or ‘isolated’ defects (Fe'Ti, V0°°) are formed. These results are analyzed in terms of a core–shell model. Accordingly, the obtained Fe3+-modified PbTiO3 nanoparticles consist of a ferroelectric core, a distorted interface region, and a cubic dead layer which is paraelectric.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2010 |
| Autor(en): | Erdem, Emre ; Kiraz, Kamil ; Somer, Mehmet ; Eichel, Rüdiger-A. |
| Art des Eintrags: | Bibliographie |
| Titel: | Size effects in Fe3+-doped PbTiO3 nanocrystals—Formation and orientation of (Fe'Ti-V0°°)° defect-dipoles |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2010 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 30 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1016/j.jeurceramsoc.2009.04.034 |
| Kurzbeschreibung (Abstract): | A set of Fe3+-modified PbTiO3 nanopowders has been synthesized according to the combined polymerization and pyrolysis (CPP) route of metallorganic precursors [Erdem E, Böttcher R, Semmelhack H-C, Gläsel H-J, Hartmann E, Hirsch D. Preparation of lead titanate ultrafine powders from combined polymerisation and pyrolysis route. J. Mater. Sci. 2003;38:3211–7] with subsequent calcination at various temperatures. X-ray diffraction verifies the formation of a PbTiO3 perovskitic phase and Raman-spectroscopy proves the existence of ferroelectricity. Furthermore, the prevailing defect structure has been investigated by means of electron paramagnetic resonance (EPR) spectroscopy. The EPR results clearly indicate marked size effects by approaching to the critical grain size (dcrit<12 nm) at which a size-driven tetragonal-to-cubic phase transition is observed at room temperature. As a function of mean grain size, either (Fe'Ti-V0°°)° defect dipoles or ‘isolated’ defects (Fe'Ti, V0°°) are formed. These results are analyzed in terms of a core–shell model. Accordingly, the obtained Fe3+-modified PbTiO3 nanoparticles consist of a ferroelectric core, a distorted interface region, and a cubic dead layer which is paraelectric. |
| Freie Schlagworte: | Size effects; Ferroelectric-to-paraelectric phase transition; Critical size; Lead titanate ferroelectrics; Iron doping; Oxygen vacancies; Defect dipoles |
| Zusätzliche Informationen: | SFB 595 B1 |
| Fachbereich(e)/-gebiet(e): | DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung > Teilprojekt B1: EPR Untersuchung von Defekten in ferroelektrischen keramischen Werkstoffen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 08 Aug 2011 09:46 |
| Letzte Änderung: | 05 Mär 2013 09:51 |
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