• effect of ti substitution on thermoelectric properties of w-doped heusler fe2val alloy

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 818
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     effects of element substitutions on thermoelectric properties of heusler fe2val alloys were evaluated. by w substitution at the v site, the thermal conductivity is reduced effectively because of the enhancement of phonon scattering resulting from the introduction of w atoms, which have much greater atomic mass and volume than the constituent elements of fe2val alloy. w substitution is also effective to obtain a large negative seebeck coefficient and high electrical conductivity through an electron injection effect. to change the conduction type from n-type to p-type, additional ti substitution at the v site, which reduces the valence electron density, was examined. a positive seebeck coefficient as high as that of conventional p-type fe2val alloy was obtained using a sufficient amount of ti substitution. electrical resistivity was reduced by the hole doping effect of the ti substitution while maintaining low thermal conductivity. compared with the conventional solo-ti-substituted p-type fe2val alloy, the zt value was improved, reaching 0.13 at 450 k.

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