• percolation conduction in hybrid thermoelectric material consisting of bi0.88sb0.12 and barium ferrite particles

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 978
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a hybrid material consisting of thermoelectric bi0.88sb0.12 and ba ferrite bi0.88sb0.12(bafe12o19) x(x = 0, 0.025, 0.04, and 0.08) was synthesized using sintering. powder x-ray diffraction patterns and scanning electron microscopy images of the hybrid indicate that the bafe12o19 particles were well distributed in the host bi0.88sb0.12 phase. the temperature dependence of the electrical resistivity ρof the host bi-sb exhibits metallic behavior. by the addition of ba ferrite particles, the ρ at 300 k increases intensively, and ρ(τ) then behaves similarly to a semiconductor. however, it is noted that the thermoelectric power s is unchanged. inhibition of current and heat flows by a restricted conduction path and the unchanged electromotive force generated by the seebeck effect in the conduction path can be understood based on a site-percolation model consisting of conducting bi-sb and insulating ba ferrite. the critical volume fraction p c of this system was estimated experimentally as p c = 0.68.

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