| Budget Amount *help |
¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2013: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Outline of Final Research Achievements |
Boron carbide is a promising candidate of thermoelectric (TE) materials which generate electric power from the enormous amount of unused waste heat. In this research, we successfully synthesized boron carbide nanowires (BCNWs) and measured their electrical transport and thermoelectric properties. We found that the BCNW achieved a higher Seebeck coefficient and power factor than those of the bulk sample. The conduction mechanism of the BCNWs at low temperatures below 300 K is different from that of the bulk sample. At around 300 K, there is a crossover temperature between electrical conduction by variable-range hopping and phonon-assisted hopping. The inhomogeneous carbon concentration and planar defects are thought to modify the bonding nature and electronic structure of the BCNW. A lightweight and high-strength TE module by using the BCNWs that possess higher TE performance than the bulk materials can be expected.
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