High temperature thermoelectric properties of (Ca, Ce)₄Mn₃O₁₀

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• 作者：Zhou ; Yuqin ; Matsubara ; Ichiro ; Funahashi ; Ryoji ; Xu ; Gaojie ; Shikano ; Masahiro
• 关键词：A. Oxides ; B. Chemical synthesis ; C. X-ray diffraction ; D. Electric properties ; D. Thermal conductivity
• 刊名：Materials Research Bulletin
• 出版年：2002
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：May, 2002
• 卷：37
• 期：6
• 页码：1123-1131
• 文件大小：143 K

摘要

Thermoelectric (TE) properties such as resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) of Ca_4−3xCe_3xMn₃O₁₀ (0<x≤0.03) polycrystalline samples were measured from room temperature to 1000K. ρ shows an obvious decrease with the increment of Ce content. The hopping conduction mechanism is used to explain the conduction behavior of these samples. The negative S values indicate that these materials are n-type. The sample of x=0.03 has the largest power factor, 0.52×10⁻⁴Wm⁻¹K⁻² at 1000K. The value of κ and the dimensionless figure of merit of this sample is 1.51Wm⁻¹K⁻¹ and 0.034 at 1000K, respectively.