Off-stoichiometric Effects on Thermoelectric Properties of Fe2VAl-based Compounds
Off-stoichiometric Effects on Thermoelectric Properties of Fe2VAl-based Compounds
复制标题
Fe2VAl 基化合物热电性能的非化学计量效应
DOI：
10.2497/jjspm.57.207
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. Soda
中科院分区：
文献类型：
--
作者：
Y. Sandaiji;N. Ide;Y. Nishino;T. Ohwada;S. Harada;K. Soda
本文报道了Fe_（2-x）（V_（1 + x-y）Ti_y）Al合金（-0.04 ≤x≤0.02，0≤y≤0.10）的热电性能。虽然与化学计量比Fe 2 VAl成分的微小偏差会导致Seebeck系数的增强，但Ti对V的轻微取代会导致Seebeck系数的进一步增加和电阻率的降低。当x=-0.04和y=0.03时，300 K时的Seebeck系数达到110 μV/K，这是迄今为止报道的p型Fe 2 VAl基合金中最大的。用软X射线光电子能谱研究了Fe 2-xV 1 +xAl合金（x=−0.04，0和0.02）的电子结构。富铁合金（x=-0.04）的EF附近的价带谱与化学计量的Fe 2 VAl的价带谱相比发生了巨大的变化。因此，非化学计量比合金的塞贝克系数的显著增强可能是由于费米能级EF周围的价带侧的能带结构的修改。
We report on the thermoelectric properties of Fe2-x(V1+x-yTiy)Al alloys (−0.04≤x≤0.02, 0≤y≤0.10). While a small deviation from the stoichiometric Fe2VAl composition causes an enhancement in the Seebeck coefficient, a slight substitution of Ti for V leads to a further increase in the Seebeck coefficient and a decrease in the electrical resistivity. The Seebeck coefficient reaches 110 μV/K at 300 K for x=−0.04 and y=0.03, which is the largest in the p-type Fe2VAl-based alloys so far reported. The electronic structures of Fe2-xV1+xAl alloys with x=−0.04, 0 and 0.02 have been investigated by soft X-ray photoelectron spectroscopy. The valence-band spectra near the EF of Fe-rich alloy (x=−0.04) is drastically changed from that of the stoichiometric Fe2VAl. Therefore substantial enhancements in the Seebeck coefficient for the off-stoichiometric alloys could be due to a modification in the band structure on the valence band side around the Fermi level EF.
影响因子：
3.7
作者：
K. Soda;H. Murayama;K. Shimba;S. Yagi;J. Yuhara;T. Takeuchi;U. Mizutani;H. Sumi;Masaaki Kato;H. Kato;Y. Nishino;A. Sekiyama;S. Suga;T. Matsushita;Y. Saitoh
通讯作者：
K. Soda;H. Murayama;K. Shimba;S. Yagi;J. Yuhara;T. Takeuchi;U. Mizutani;H. Sumi;Masaaki Kato;H. Kato;Y. Nishino;A. Sekiyama;S. Suga;T. Matsushita;Y. Saitoh
影响因子：
--
作者：
Hitoshi Matsuura;Y. Nishino;U. Mizutani;S. Asano
通讯作者：
Hitoshi Matsuura;Y. Nishino;U. Mizutani;S. Asano
影响因子：
3.7
作者：
Nishino, Y.;Deguchi, S.;Mizutani, U.
通讯作者：
Mizutani, U.