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Extremely low thermal conductivity of b-pyrochlore oxides with cage-like crystal structure
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- Ohtaki Michitaka
- Kyushu University
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- Miyaishi So
- Kyushu University
Bibliographic Information
- Other Title
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- かご状結晶構造を持つβ-パイロクロア型酸化物の特異的に低い熱伝導率
Description
The thermal conductivity, κ, of metal oxides ATaWO6 (A = K, Rb, Cs) with β-pyrochlore structure was investigated in terms of the "rattling" motion of the smaller A cations, which is expected to scatter phonons effectively. Interestingly, the κ values are lower for the oxides containing the lighter A cations, obviously contradicting the conventional prediction of the phonon thermal conductivity. Moreover, the κ values observed for KTaWO6 were virtually the same as the theoretically predicted minimum thermal conductivity, κmin. These results strongly suggest that the phonon scattering in the oxide would really be maximized by the rattling motion of K+ in the cage.
Journal
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- Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan
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Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan 2012S (0), 34-34, 2012
The Ceramic Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282680594955776
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- NII Article ID
- 130006976649
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed