Thermoelectric Properties of La3-xAxS4 (A=Ba,Ca).
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- Katsuyama Shigeru
- Department of Materials Science and Engineering, faculty of Engineering, Osaka University
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- Tanaka Yoshiyuki
- Department of Materials Science and Engineering, faculty of Engineering, Osaka University
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- Majima Kazuhiko
- Department of Materials Science and Engineering, faculty of Engineering, Osaka University
Bibliographic Information
- Other Title
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- La3-xAxS4(A=Ba,Ca)の熱電特性
- La3-xAxS4 A Ba Ca ノ ネツデン トクセイ
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Abstract
The effectiveness of substitution for La by Ba or Ca on the physical properties of rare earth chalcogenide La3S4 was examined. Cubic γ -phase (Th3P4-type) was obtained in the range of 0≤x≤1 in La3-xAxS4 (A=Ba, Ca). The lattice parameter in La3-xBaxS4 system increased, while that in La3-xCaxS4 system decreased with an increase of x, which is ascribed to the difference of the radius among the ions. The thermoelectric power (α) and the electrical resistivity (ρ) of La3-xAxS4, which are functions of the electron concentration, increased with an increase of the temperature and the alkaline earth metal content x. A maximum value of the power factor (p=α2/ρ) at high temperature above 750K was obtained at x=0, i.e., La3S4. On the other hand, the thermal conductivity (κ) decreased with an increases of x. In result, a maximum value of the figure of merit (Z=α2/(ρκ)) was obtained at large value of x (x≈0.6 in La3-x, BaxS4 and x≈0.8 in La3-xCaxS4).
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 43 (6), 807-812, 1996
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206308546944
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- NII Article ID
- 10002012522
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 3976305
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed