Thermoelectric Properties, Defect Structure, and Electronic Structure of Ln0.9Sr0.1FeO3−δ (Ln = La and Nd)

Kiyoshi KOBAYASHI; Shu YAMAGUCHI; Toru HIGUCHI; Shik SHIN; Takeyo TSUKAMOTO; Tatsuo TSUNODA

doi:10.5796/electrochemistry.72.870

技術報文

Thermoelectric Properties, Defect Structure, and Electronic Structure of Ln_0.9Sr_0.1FeO₃₋_δ (Ln = La and Nd)

Kiyoshi KOBAYASHI, Shu YAMAGUCHI, Toru HIGUCHI, Shik SHIN, Takeyo TSUKAMOTO, Tatsuo TSUNODA

著者情報

キーワード: LaFeO₃, NdFeO₃, Electrical Conductivity, Thermoelectric Power, Thermal Conductivity, Defect Model

ジャーナルフリー

2004 年 72 巻 12 号 p. 870-875

DOI https://doi.org/10.5796/electrochemistry.72.870

詳細

抄録

The electrical conductivity, thermoelectric power, and thermal conductivity of Ln_0.9Sr_0.1FeO₃₋_δ (Ln = La and Nd) were measured as functions of temperature and oxygen partial pressure, and the electrical transport parameters were calculated using the defect model. It was found that the values of hole mobility, the equilibrium constant of the annihilation reaction for the oxide ion vacancy, thermal conductivity of La_0.9Sr_0.1FeO₃₋_δ are larger than the values of Nd_0.9Sr_0.1FeO₃₋_δ, while the thermoelectric power of La_0.9Sr_0.1FeO₃₋_δ is smaller than those of Nd_0.9Sr_0.1FeO₃₋_δ at the same hole concentration and temperature. Based on the X-ray absorption spectroscopy measurements, it is suggested that the thermoelectric properties of La_0.9Sr_0.1FeO₃₋_δ and Nd_0.9Sr_0.1FeO₃₋_δ are affected by the covalency of iron ions.

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