Patterson, Eric A. ; Major, Marton ; Donner, Wolfgang ; Durst, Karsten ; Webber, Kyle G. ; Rödel, Jürgen (2016)
Temperature-Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals.
In: Journal of the American Ceramic Society, 99 (10)
doi: 10.1111/jace.14352
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
This study evaluates the change of flow stress as related to dislocation density in SrTiO3 single crystals in order to provide guidance for later electrical studies. The key parameters varied are temperature and loading rate during the deformation. It is found that in <100>-oriented SrTiO3 single crystals, the dislocation density is enhanced by plastic deformation, more so at higher temperature as compared to room temperature. The experimental approach of quantifying the dislocation density through a determination of ex situ X-ray diffraction rocking curves was successfully applied over the upper temperatures region of the lower temperature ductility zone for strontium titanate, i.e., in the so-called “A-regime”. For 1.0% deformed samples deformed at 300°C, a fourfold increase in dislocation density to 1.4 3 1013 m – 1 was found as compared to the nondeformed state (3.7 3 1012 m – 1). Cross-section techniques confirmed that the observed dislocation densities measured at the surfaces were identical to those seen in the core of the crystals. The use of rapid changes in loading rate provided an estimate for activation volume of the dislocation core for both 25°C and 300°C.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Patterson, Eric A. ; Major, Marton ; Donner, Wolfgang ; Durst, Karsten ; Webber, Kyle G. ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Temperature-Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2016 |
| Verlag: | The American Ceramic Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 99 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1111/jace.14352 |
| Kurzbeschreibung (Abstract): | This study evaluates the change of flow stress as related to dislocation density in SrTiO3 single crystals in order to provide guidance for later electrical studies. The key parameters varied are temperature and loading rate during the deformation. It is found that in <100>-oriented SrTiO3 single crystals, the dislocation density is enhanced by plastic deformation, more so at higher temperature as compared to room temperature. The experimental approach of quantifying the dislocation density through a determination of ex situ X-ray diffraction rocking curves was successfully applied over the upper temperatures region of the lower temperature ductility zone for strontium titanate, i.e., in the so-called “A-regime”. For 1.0% deformed samples deformed at 300°C, a fourfold increase in dislocation density to 1.4 3 1013 m – 1 was found as compared to the nondeformed state (3.7 3 1012 m – 1). Cross-section techniques confirmed that the observed dislocation densities measured at the surfaces were identical to those seen in the core of the crystals. The use of rapid changes in loading rate provided an estimate for activation volume of the dislocation core for both 25°C and 300°C. |
| Freie Schlagworte: | plasticity, single Crystal, dislocations, strontium titanate, perovskites |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 26 Okt 2016 07:15 |
| Letzte Änderung: | 25 Jan 2018 07:45 |
| PPN: | |
| Sponsoren: | EAP and JR are indebted to the Deutsche Forschungsgemeinschaft for funding their contributions through the Leibniz award under Ro954/22. |
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