| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
We have studied the temperature dependence of the thermal conductivity \lambda of Mn-based giant magnetocaloric materials showing the first-order magnetic transition (FOMT) near room temperature. First, we synthesized high-quality (MnFeRu)2(PSi) samples by changing the compositions and the annealing temperature.
The thermal conductivity of (MnFeRu)2(PSi) is abruptly reduced on the first cooling due to the micro-cracks generated during the FOMT. On heating, the thermal conductivity smoothly increases with increasing temperature. It was found that the \lambda- T curve is not sensitive to the thermal cycle after the first cooling. This means that fewer micro-cracks were generated at subsequent phase transitions.The \lambda - T curves have small humps near the Curie temperature. We have proposed that the coexistence of a two-phase region by alloying is responsible for the humps in the \lambda - T curve.
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