| 研究課題/領域番号 |
22F22756
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| 配分区分 | 補助金 |
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| 研究機関 | 芝浦工業大学 |
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研究代表者 |
Mele Paolo 芝浦工業大学, 工学部, 教授 (70608504)
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| 研究分担者 |
LATRONICO GIOVANNA 芝浦工業大学, SIT総合研究所, 外国人特別研究員
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| 研究期間 (年度) |
2022-11-16 – 2025-03-31
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| キーワード | Skutterudites / doping / filler / SPS / quenching / thermoelectrics |
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| 研究実績の概要 |
An attempt of preparing the double filled skutterudites of composition (Sm,Nd)y(FexNi1-x)4Sb12 was made. Due to the small quantity of fillers, we tried, in collaboration with Genova University, to prepare a precursor Sm0.15Nd0.5Sb0.8 to reduce the error in the amount of rare earths. Unfortunately, after preparing the skutterudites and analyzing it via XRD and SEM, we found out that the precursor was contaminated with Ta, coming from the crucible used for the synthesis. So, waiting for the purchase of some Nd, the fellow successfully prepared three samples of skutterudite doped with Sn: Smy(FexNi1-x)4Sb11.5Sn0.5
The three samples were prepared following the directions of collaborators which have recently studied the crossover of the system: X= 0.45 as n-type semiconductor; X = 0.55 as n-p crossover semiconductor; X = 0.65 as p-type semiconductor.
Samples were then ground, sieved and densified by SPS (500 ℃ for 7 minutes)
Room T Seebeck is promising (about -90 microV/K) and the samples will be sent soon to collaborators at NIMS to measure the thermal conductivity and power factor.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
Due to a contaminated precursor, the first batch of samples of composition (Sm,Nd)y(FexNi1-x)4Sb12 was not suitable for continuing the investigation.
The fellow started with the dopant approach in the meanwhile preparing the composition Smy(FexNi1-x)4Sb11.5Sn0.5.
The custom made apparatus to measure the power factor in the laboratory is not working properly, so samples are going to be sent to collaborators as soon as possible.
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| 今後の研究の推進方策 |
The first step for the future work is to measure the thermoelectric properties of the doped samples belonging to the system Smy(FexNi1-x)4Sb11.5Sn0.5. After the characterization of the bulk, the synthesis will be repeated and targets of 1.5 cm of diameter will be densified via SPS to be used as targets for the thin film deposition via PLD.
In the meanwhile, new tentative of synthetizing multi-filled skutterudites will be done. As for the Sn-doped samples, first the bulks will be studied, and then pellets will be used to deposit thin films.
In the end, the addition of carbon-based nanodefects will be tried in the attempt of reducing the thermal conductivity, as reported for some Co-based skutterudites.
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