Development of Heusler‐Type Fe2VAl Alloys for Thermoelectric Power Generation

Development of Heusler‐Type Fe2VAl Alloys for Thermoelectric Power Generation
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用于热电发电的 Heusler 型 Fe2VAl 合金的开发

DOI:
10.1007/978-3-319-48237-8_46
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发表时间:
2014
期刊:
--
影响因子:
--
通讯作者:
Y. Nishino
Y. Nishino
中科院分区:
--
文献类型:
--
作者:
M. Mikami;Y. Nishino

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Heusler合金Fe2VAl因其高热电功率因数(如在300 K时为5.5 mW/ mk2)而成为热电发电的有希望的候选者。这种高功率因数是由费米能级附近的陡赝隙产生的。在刚性带模型内控制价电子浓度可以同时提高塞贝克系数和电导率。此外,最近对非化学计量成分控制的研究,如Fe2-xV1+xAl,表明电子能带结构的改变可以进一步提高塞贝克系数,从而提高功率因数。通过构建仅由Fe2VAl合金组成的热电模块来评估发电能力。得到了0.7 W/cm2的高输出功率密度。Fe2VAl模块的耐久性源于高机械强度和优异的抗氧化性,增强了实际热电发电的实用性。
A Heusler alloy, Fe2VAl, is a promising candidate for thermoelectric power generation because of its high thermoelectric power factor, such as 5.5 mW/mK2at 300 K. This high power factor is produced by a steep pseudogap around the Fermi level. The simultaneous enhancement of Seebeck coefficient and electrical conductivity can be achieved by the control of valence electron concentration within a rigid band model. Moreover, recent studies in the off-stoichiometric composition control, such as Fe2-xV1+xAl, suggest that the modification of the electronic band structure can further enhance the Seebeck coefficient, resulting in the higher power factor. The power generation ability was evaluated by the construction of a thermoelectric module consisting of only the Fe2VAl alloy. A high output power density of 0.7 W/cm2 was then obtained. The durability of the Fe2VAl module derived from high mechanical strength and excellent resistance to oxidation enhances utility for practical thermoelectric power generation.
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影响因子: 3.7
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