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Analysis of domain structure in the Ce0.8Sm0.15Ca0.05O1.875 sample

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Abstract

A Ce0.8Sm0.15Ca0.05O1.875 (S15C05DC) sample is synthesized by a solid-state reaction serving as a potential electrolyte material for intermediate-temperature solid oxide fuel cells. The sintered sample was found to be dense with a cubic fluorite structure. The addition of Ca2+ can act as a CeO2 sintering aid for accelerating the process. The microstructures and properties of the sample were analyzed by X-ray diffractometry, Raman spectroscopy, scanning electron microscopy, thermomechanical analysis, and transmission electron microscopy. Existing oxygen vacancies in the sample are indicated by a Raman peak at 558 cm−1. The thermal expansion coefficient of the S15C05DC sample at 200–800 °C is approximately 12–14 × 10−6 °C−1. The control of domain size is an important factor for improving the conductivity of S15C05DC. Local clustered nano-domains, with higher Sm2O3 concentrations, were found to regularly arrange to induce the formation of a nanoscale C-type superlattice structure. While Ca doping decreased the formation of the C-type Sm2O3 structure.

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Acknowledgements

We thank the Ministry of Science and Technology of Taiwan for funding support through contracts MOST 103-2221-E-027-010 and MOST 105-2221-E-027-024.

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Authors and Affiliations

  1. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-hsiao E. Rd., Taipei, 10608, Taiwan

    Yu-Chuan Wu & Yi-Yao Liao

  2. Institute of Materials Science and Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan

    Yu-Chuan Wu

  3. Department of Chemical and Materials Engineering, Chinese Culture University, Taipei, 11114, Taiwan

    Yu-Chuan Wu

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  1. Yu-Chuan Wu
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  2. Yi-Yao Liao
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Correspondence to Yu-Chuan Wu.

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Wu, YC., Liao, YY. Analysis of domain structure in the Ce0.8Sm0.15Ca0.05O1.875 sample. J Electroceram 38, 81–91 (2017). https://doi.org/10.1007/s10832-017-0065-2

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