| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Outline of Final Research Achievements |
In the present study, we adopted a method of replacing the Ca2+ and Sr2+ sites of perovskite-type oxides CaMnO3 and SrTiO3 with "complex cations" consisting of two cations with different valence, in order to reduce their thermal conductivity. For the CaMnO3-based system, replacing 10% of the Ca2+ sites with a complex cation consisting of Gd3+ and Na+ significantly reduced the thermal conductivity and gave a high power factor, resulting in a significant improvement in the dimensionless performance index ZT compared to pure CaMnO3. For (La1/2K1/2)TiO3, in which all of the Sr2+ in SrTiO3 is replaced by a complex cation consisting of La3+ and Na+, it was found that both high electrical conductivity and low thermal conductivity can be achieved by increasing the grain size.
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