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مجله مواد الکترونیکی 2013
جزئیات رویداد
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همایش ، رویداد ، ژورنال

  • effect of sintering temperature on microstructure, electrical properties, and thermal expansion of perovskite-type la0.8ca0.2cro3 complex oxides synthesized by a combustion method

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1000
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     perovskite-type la0.8ca0.2cro3 complex oxides were synthesized by a combustion method. microstructural evolution, electrical properties, and thermal expansion behavior of the ceramics were investigated in the sintering temperature range of 1250°c to 1450°c. it was found that the electrical conductivity (σ e) remarkably improved with increasing sintering temperature from 1250°c to 1400°c, ascribed to the development of microstructural densification, whereas it declined slightly above 1400°c due to generation of excessive liquid. the specimen sintered at 1400°c had a maximum conductivity of 31.6 s cm−1 at 800°c, and lowest activation energy of 0.148 ev. the improvement of the thermal expansion coefficient (tec) with increasing sintering temperature was monotonic as a result of the microstructural densification of the materials. the tec of la0.8ca0.2cro3 sintered at 1400°c was about 10.5 × 10−6 k−1, being consistent with other components as high-temperature conductors. with respect to microstructure, electrical properties, and thermal expansion, the preferable sintering temperature was ascertained to be about 1400°c, which is much lower than for the traditional solid-state reaction method.

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