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Development of "Rattling" Oxide Thermoelectric Materials with Cage-like Crystal Structure
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- Ohtaki Michitaka
- Principal Investigator
- 九州大学
About This Project
- Japan Grant Number
- JP25620152 (JGN)
- Funding Program
- Grants-in-Aid for Scientific Research
- Funding Organization
- Japan Society for the Promotion of Science
Kakenhi Information
- Project/Area Number
- 25620152
- Research Category
- Grant-in-Aid for Challenging Exploratory Research
- Allocation Type
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- Multi-year Fund
- Review Section / Research Field
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- Science and Engineering > Chemistry > Applied Chemistry > Energy-related chemistry
- Research Institution
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- Kyushu University
- Project Period (FY)
- 2013-04-01 〜 2016-03-31
- Project Status
- Completed
- Budget Amount*help
- 4,030,000 Yen (Direct Cost: 3,100,000 Yen Indirect Cost: 930,000 Yen)
Research Abstract
Although there has been no report on “rattling” oxides with the “rattler-in-a-cage” structure, here we report the thermal properties of defect pyrochlore (β-pyrochlore) oxides with smaller cations in an oversized cage-like crystal structure. It was clearly shown for the first time that the thermal diffusivity, α, and the thermal conductivity, κ, are lower for the oxides containing lighter A-site cations, contradicting to the conventional prediction of the phonon thermal conductivity, in which lighter comprising atoms must give higher κ. The findings including the Raman spectra of the samples directly evidenced the “rattling” effect of the loosely bound cations on the thermal transport properties of the oxides. The κ values of these oxides are extremely low (below 1.0 W/mK). Although their electrical conductivity was still insufficient, an appropriate selection of the framework composition enabled us to have better thermoelectric performance.
Keywords
Details 詳細情報について
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- CRID
- 1040282257242973824
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- Text Lang
- ja
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- Data Source
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- KAKEN