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مجله مواد الکترونیکی 2013
جزئیات رویداد
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  • grain-oriented ca3co4o9 thermoelectric oxide ceramics prepared by solid-state reaction

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 145
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we studied a method to enhance the degree of grain orientation of ca3co4o9 thermoelectric oxide ceramics. ceramic specimens were prepared by solid-state reaction with different growth conditions. large-grained ca3co4o9 powders were obtained by using “heavy-calcination” and “moderate-grinding” steps before pelletizing, and these large-grained powders contributed to the enhancement of the degree of orientation.scanning electron microscopy  (sem) observation results showed that plate-like crystal grains were stacked up in layers for the heavily calcined ceramics, while no such anisotropic structure was found for those that were lightly calcined. x-ray diffraction (xrd) analysis also indicated that the specimen obtained by heavy-calcination and moderate-grinding steps had a high degree of (002) orientation. the effect of the heavy-calcination and moderate-grinding steps was clearly evidenced by the electrical resistivity ρ. the electrical resistivity ρ at 700°c for the higher-oriented ceramics was 73% of that for the lower-oriented ceramics. since ρ was reduced without deterioration of the seebeck coefficient s, the power factor (s 2/ρ) at 700°c for the former was increased by 29% compared with that for the latter.

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