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Thermal Stability and Anisotropic Thermal Expansion of SmBa1−xSrxCo2O5+δ (0.1 ≤ x ≤ 0.5)

  • S. N. Qadri
  • S. B. QadriEmail author
Article

Abstract

Bulk samples of SmBa1−xSrxCo2O5+δ were synthesized using solid-state chemical reaction of the starting metal oxides in the appropriate weight ratios and heating in air at temperatures approaching 1223 K. Their thermal expansion coefficients were determined using in situ x-ray diffraction studies between 298 K and 1273 K. No phase transition was observed during the heating or the cooling cycle. The volumetric thermal expansion coefficients for samples with orthorhombic Pmmm phase are 6 × 10−5 K−1(x = 0.0), 6.8 × 10−5 K−1 (x = 0.3) and 6.4 × 10−5 K−1 (x = 0.5), and for sample with an orthorhombic phase Pnma 7.1 × 10−5 K−1 (x = 1). The linear thermal expansion showed anisotropy of αa or αc > αb for samples with Pmmm phase and no anisotropy for the x = 1 sample.

Keywords

Thermal expansion x-ray diffraction solid oxide fuel cells 

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Notes

Acknowledgements

One of us SNQ is thankful to Prof. J. Irvine for his guidance and discussions.

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© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2019

Authors and Affiliations

  1. 1.U. S. Naval Research LaboratoryWashington, DCUSA

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