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Influence of the annealing conditions on temperature-dependent ferroelastic behavior of LSCF

Riess, Kevin and Geiger, Philipp T. and Khansur, Neamul H. and Steiner, Sebastian and Frömling, Till and Hinterstein, Manuel and Webber, Kyle G. (2019):
Influence of the annealing conditions on temperature-dependent ferroelastic behavior of LSCF.
In: Materialia, Elsevier Science Publishing, 2019, (6), DOI: 10.1016/j.mtla.2019.100297, [Article]

Abstract

The macroscopic ferroelastic behavior of polycrystalline (La 0.6 Sr 0.4)0.95Co0.2Fe0.8O3−d and its dependence on an- nealing conditions was investigated over a temperature range from − 150°C to 150°C. A temperature- and defect concentration-dependent variation of the ferroelastic behavior was attributed to internal stresses, oxygen defi- ciency, and a corresponding change of the crystal structure. In particular, there was an observed decrease in remanent strain and the formation of a closed ferroelastic hysteresis loop at temperatures below approximately 0 °C for samples annealed in air, which was suppressed through the reduction in oxygen vacancies by annealing the samples in oxygen. The macroscopic mechanical behavior as a function of annealing conditions is discussed with respect to the crystal structure and oxygen deficiency determined by means of x-ray and neutron diffraction.

Item Type: Article
Erschienen: 2019
Creators: Riess, Kevin and Geiger, Philipp T. and Khansur, Neamul H. and Steiner, Sebastian and Frömling, Till and Hinterstein, Manuel and Webber, Kyle G.
Title: Influence of the annealing conditions on temperature-dependent ferroelastic behavior of LSCF
Language: English
Abstract:

The macroscopic ferroelastic behavior of polycrystalline (La 0.6 Sr 0.4)0.95Co0.2Fe0.8O3−d and its dependence on an- nealing conditions was investigated over a temperature range from − 150°C to 150°C. A temperature- and defect concentration-dependent variation of the ferroelastic behavior was attributed to internal stresses, oxygen defi- ciency, and a corresponding change of the crystal structure. In particular, there was an observed decrease in remanent strain and the formation of a closed ferroelastic hysteresis loop at temperatures below approximately 0 °C for samples annealed in air, which was suppressed through the reduction in oxygen vacancies by annealing the samples in oxygen. The macroscopic mechanical behavior as a function of annealing conditions is discussed with respect to the crystal structure and oxygen deficiency determined by means of x-ray and neutron diffraction.

Journal or Publication Title: Materialia
Volume: 2019
Number: 6
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Perovskite Mechanical properties Ferroelastic X-ray diffraction (XRD) Oxygen deficiency
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
Date Deposited: 29 Mar 2019 09:21
DOI: 10.1016/j.mtla.2019.100297
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