| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Bi2Te3-Sb2Te3 was prepared by mechanical alloying (MA) followed by hot pressing (HP). These results indicate that the maximum dimensionless figure of merit ZT of the Bi2Te3-Sb2Te3 obtained by MA-HP was not restricted to a composition of the minimum phonon thermal conductivity in the case of melt growth. This mechanism was investigated from the viewpoint of thermoelectric properties and material structure.
The thermoelectric materials were fabricated at various ball-milling speeds with yttria-stabilized zirconia (YSZ) ceramic balls and vessel, and then hot-pressed. The contamination from the YSZ vessel and milling balls did not affect the thermal conductivities of the Bi0.3Sb1.7Te3.0 bulk materials. ZT remained above 1.0 and reached the peak of 1.16 at room temperature for the sample milled at 130 rpm and hot-pressed at 350 °C. Thus, the thermoelectric properties can be improved by preventing to segregation of constitutional elements and selecting appropriate milling vessels and balls.
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