Cation Distribution Dependence on Thermoelectric Properties of Doped Spinel M₀.₆Fe₂.₄O₄
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- Nozaki Tomohiro
- Department of Applied Physics, Graduate School of Engineering, Tohoku University
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- Hayashi Kei
- Department of Applied Physics, Graduate School of Engineering, Tohoku University
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- Miyazaki Yuzuru
- Department of Applied Physics, Graduate School of Engineering, Tohoku University
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- Kajitani Tsuyoshi
- Department of Applied Physics, Graduate School of Engineering, Tohoku University
書誌事項
- タイトル別名
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- Cation Distribution Dependence on Thermoelectric Properties of Doped Spinel M<sub>0.6</sub>Fe<sub>2.4</sub>O<sub>4</sub>
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抄録
The electrical conductivity, Seebeck coefficient, and thermal conductivity of polycrystalline M0.6Fe2.4O4 (M = Ni, Ni0.5Mg0.5, Ni0.5Zn0.5, Zn) were measured to elucidate cation distribution-dependent changes. Preferential occupation by the doped cation in the iron spinel has been noted: Zn2+ ions prefer to occupy the tetrahedral A-site, while Ni2+ and Mg2+ prefer to occupy the octahedral B-site. While the electrical conductivity and Seebeck coefficient are almost cation distribution-independent, the thermal conductivity at room temperature is sensitive to the cation distributions. The lowest thermal conductivity of 2.0 W m−1 K−1 at room temperature is observed for Zn0.6Fe2.4O4. The value is about one third of that of Ni0.6Fe2.4O4. The thermal transport of MxFe3−xO4 is mainly affected by cation distribution at the A-site, while the electrical transport is affected by the B-site, which is discussed in terms of the point defects at the A- and B-sites. Due to the disordering at the A- and B-sites, the thermal conductivity of MxFe3−xO4 could be reduced without decreasing the electrical conductivity. Doped spinel-ferrite MxFe3−xO4 would be a kind of “phonon-glass electron-crystal” material.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 53 (6), 1164-1168, 2012
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001204250409344
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- NII論文ID
- 10030630375
- 130004824896
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 023682546
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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