采用急冷甩带法和放电等离子体烧结(SPS)制备得到了块体Bi2Te2.7Se0.3热电材料,在室温下测量其热电性能,Seebeck系数最高达到-139.33μV·K-1,功率因子也有所提高,最大值1.71×103w·m-1·K-2,计算得到最大热电优值0.421.材料经急冷甩带后,微观组织结构发生变化,内部缺陷增多,晶粒细化,改变了载流子的散射机制,增强了声子散射.虽然电导率有一定程度减小,但Seebeck系数增大,热导率减小,提高了热电性能.
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