| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Off-stoichiometric Fe2V1+x-yTayAl1-x alloys are of n-type for V-rich composition (x>0) but of p-type for Al-rich composition (x<0). The n-type alloy shows the power factor reaching 5.8×10-3 W/mK2, in parallel with the possession of the thermal conductivity as low as 5.6 W/mK, because of the synergistic effect of off-stoichiometry and Ta substitution. Thus the dimensionless figure of merit leads to ZT=0.29 at 400K. In addition, the p-type alloy shows the power factor of 3.3×10-3 W/mK2 and ZT=0.13 at 350K. On the other hand, the p-type alloys derived from n-type Fe2V1+xAl1-x with Ti doping show a comparable value of the above ZT even without Ta substitution.
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