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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72600

    Title: 利用火花電漿燒結製備鋁摻雜矽塊材之熱電性質研究;The study of thermoelectric properties for the aluminum doped silicon by Spark Plasma Sintering
    Authors: 曹森霖;Tsao, Sen-Lin
    Contributors: 材料科學與工程研究所
    Keywords: ;;火花電漿燒結;熱電性質;Silicon;Aluminum;Spark Plasma Sintering;thermoelectric properties
    Date: 2016-12-07
    Issue Date: 2017-01-23 16:35:19 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 矽塊材在室溫下是高熱導率的材料,約150W/m*K,也因此純矽塊材為不良的熱電材料。為了提升熱電性質,球磨並添加摻雜元素是常見的方法,利用界面散射使熱導率下降,以摻雜提升電導率。
    ;The thermal conductivity of bulk silicon is 150 W/m*K at room temperature. It is considered as poor thermoelectric materials. Ball milling with doping is a common method for enhancing thermoelectric efficient.
    In our study, silicon and aluminum particles were milled in a ball mill bar with different ratio for 24 hours. After milling, the milled particles were fabricated into bulk samples via spark plasma sintering. The sintering temperature was 1000°C, which was lower than that often used in the sintering of silicon. The reason for the lower sintering temperature is that the molten aluminum can help the connection of silicon particles and enhance the crystallinity. After sintering, we measured the thermoelectric properties of bulk sintered sample from room temperature to 450°C. We found that the electrical conductivity was significantly improved when the aluminum exceeds 5at%. The result shows that addition of more than 5at% aluminum has significant doping effect and we found that the sintered bulk sample has the improved thermoelectric properties with the addition of aluminum of 5at%.
    Appears in Collections:[材料科學與工程研究所 ] 博碩士論文

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