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Temperature-dependent structural behaviour of samarium cobalt oxide

Published online by Cambridge University Press:  22 August 2017

Matthew R. Rowles ,
Cheng-Cheng Wang ,
Kongfa Chen ,
Na Li ,
Shuai He  and
San-Ping Jiang
Matthew R. Rowles*
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia
Cheng-Cheng Wang
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia
Kongfa Chen
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia
Na Li
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia College of Science, Heilongjiang University of Science and Technology, Harbin 150022, China
Shuai He
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia
San-Ping Jiang
Affiliation:
Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth WA 6185, Australia
*
a)Author to whom correspondence should be addressed. Electronic mail: matthew.rowles@curtin.edu.au
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Abstract

The crystal structure and thermal expansion of the perovskite samarium cobalt oxide (SmCoO3) have been determined over the temperature range 295–1245 K by Rietveld analysis of X-ray powder diffraction data. Polycrystalline samples were prepared by a sol–gel synthesis route followed by high-temperature calcination in air. SmCoO3 is orthorhombic (Pnma) at all temperatures and is isostructural with GdFeO3. The structure was refined as a distortion mode of a parent $ Pm{\bar 3}m $ structure. The thermal expansion was found to be non-linear and anisotropic, with maximum average linear thermal expansion coefficients of 34.0(3) × 10−6, 24.05(17) × 10−6, and 24.10(18) × 10−6 K−1 along the a-, b-, and c-axes, respectively, between 814 and 875 K.

Keywords

structure determinationthermal expansionsolid-oxide fuel cell
Type
Technical Articles
Information
Powder Diffraction , Volume 32 , Supplement S2 , December 2017 , pp. S38 - S42
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Copyright
Copyright © International Centre for Diffraction Data 2017 

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