Thermoelectric properties of Bi1.5Pb0.5Sr2-xLaxCo2Oy polycrystalline materials
来源期刊：Rare Metals2011年第5期
论文作者：YE Jinqin a , LI Haidong a , and HE Qinglin b a Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou , China b Department of Physics, Jiaozuo Teacher’s College, Jiaozuo , China
文章页码：501 - 504
摘 要：Polycrystalline samples of Bi 1.5 Pb 0.5 Sr 2-x La x Co 2 O y （x = 0.1, 0.2, 0.3） with a layered structure were prepared by solid-state reaction method. All samples are p-type semiconductors. The thermoelectric properties, namely, the electric resistivity （ρ）, Seebeck coefficient （S）, and power factor （S 2 /ρ） of the samples are dependent on chemical composition. The values of ρ, S, and S 2 /ρ increase with an increase in temperature for all samples. The substitution of Pb 2+ for Bi 3+ and La 3+ for Sr 2+ improves the thermoelectric properties of the Bi 2 Sr 2 Co 2 O y system owing to the simultaneous decrease of electric resistivity and increase of Seebeck coefficient. As a result, the optimal thermoelectric property has been obtained in Bi 1.5 Pb 0.5 Sr 1.7 La 0.3 Co 2 O y and the power factor can reach 2.1 × 10-4 W·m-1 K-2 at 998 K.
摘要：Polycrystalline samples of Bi 1.5 Pb 0.5 Sr 2-x La x Co 2 O y （x = 0.1, 0.2, 0.3） with a layered structure were prepared by solid-state reaction method. All samples are p-type semiconductors. The thermoelectric properties, namely, the electric resistivity （ρ）, Seebeck coefficient （S）, and power factor （S 2 /ρ） of the samples are dependent on chemical composition. The values of ρ, S, and S 2 /ρ increase with an increase in temperature for all samples. The substitution of Pb 2+ for Bi 3+ and La 3+ for Sr 2+ improves the thermoelectric properties of the Bi 2 Sr 2 Co 2 O y system owing to the simultaneous decrease of electric resistivity and increase of Seebeck coefficient. As a result, the optimal thermoelectric property has been obtained in Bi 1.5 Pb 0.5 Sr 1.7 La 0.3 Co 2 O y and the power factor can reach 2.1 × 10-4 W·m-1 K-2 at 998 K.
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