• effect of heavy element substitution and off-stoichiometric composition on thermoelectric properties of fe2val-based heusler phase

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 939
    • تعداد پرسش و پاسخ ها: 0
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     the thermoelectric performance of fe2val-based alloys was improved by using the effects of (a) heavy element substitution and (b) off-stoichiometric (fe/v ≠ 2) composition. the former method led to a significant reduction of lattice thermal conductivity, whereas the latter to an evolution of the seebeck coefficient. as a result of sample preparation, we confirmed that the dimensionless figure of merit with n-type behavior was increased up to 0.25 at 420 k for the sample obtained at the optimized composition of fe1.98v0.97ta0.05al0.9si0.1. electronic structure calculations revealed that the increase of the seebeck coefficient observed for fe-poor samples was caused by a reduction of the density of states near the chemical potential.

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