TU Darmstadt / ULB / TUbiblio

Temperature-Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals

Patterson, Eric A. and Major, Marton and Donner, Wolfgang and Durst, Karsten and Webber, Kyle G. and Rödel, Jürgen (2016):
Temperature-Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals.
In: Journal of the American Ceramic Society, The American Ceramic Society, pp. 3411-3420, 99, (10), ISSN 0002-7820, [Article]

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.

Item Type: Article
Erschienen: 2016
Creators: Patterson, Eric A. and Major, Marton and Donner, Wolfgang and Durst, Karsten and Webber, Kyle G. and Rödel, Jürgen
Title: Temperature-Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals
Language: English
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.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 99
Number: 10
Publisher: The American Ceramic Society
Uncontrolled Keywords: plasticity, single Crystal, dislocations, strontium titanate, perovskites
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 26 Oct 2016 07:15
Identification Number: doi:10.1111/jace.14352
Funders: EAP and JR are indebted to the Deutsche Forschungsgemeinschaft for funding their contributions through the Leibniz award under Ro954/22.
Export:

Optionen (nur für Redakteure)

View Item View Item