• effects of reaction temperature on thermoelectric properties of p-type nanostructured bi2−x sb x te3 prepared using hydrothermal method and evacuated-and-encapsulated sintering

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 848
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we report fabrication of nanostructured bi2−x sb x te3 using hydrothermal method followed by cold-pressing and evacuated-and-encapsulated sintering techniques. to obtain lower resistivity, the reaction temperature in the hydrothermal synthesis is investigated, and the effects on the zt values of bi2−x sb x te3 are reported. both the x = 1.52 and 1.55 samples hydrothermally synthesized at 160°c show lower resistivity than the x = 1.55 sample hydrothermally synthesized at 140°c. however, the power factor is lower for the samples synthesized at 160°c due to the accompanying smaller thermopower. all three samples exhibit remarkably low thermal conductivity of around 0.41 w m−1 k−1 at room temperature. the peak zt value occurs at 270 k for all three samples, being zt = 1.75, 1.29, and 1.17 for x = 1.55 (synthesized at 140°c), 1.55 (synthesized at 160°c), and 1.52 (synthesized at 160°c), respectively.

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