OS1605 固体酸化物形燃料電池用空気極材料の強弾性的性質

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  • OS1605 Ferroelastic Properties of Cathode Materials of Solid Oxide Fuel Cells

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Temperature and frequency dependence of Young's modulus and internal friction of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> were evaluated by dynamic mechanical analysis. A relaxation peak in the internal friction which follows a significant decrease in the Young's modulus was observed. It was suggested that the peak was derived from domain reorientations. An introduction of oxygen vacancies into the sample significantly changed the temperature dependence of the Young's modulus and the internal friction. The Young's modulus became larger especially below 400 K. A small peak which depended on the oxygen vacancy concentration was observed when the oxygen vacancies were introduced. This peak was considered to be due to oxygen vacancy diffusion. Such significant changes in the temperature dependence of the Young's modulus and the internal friction may be caused by crystal structure change and pinning of domain walls by the oxygen vacancies.

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