The Study of Thermoelectric Properties for Ce3Al Doped BixSb2-xTe3

• Main Authors: Yu Heng Wu, 吳毓恆
• Other Authors: 吳月娥
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/17564731373638038702

碩士 === 臺北市立教育大學 === 應用物理暨化學系化學組碩士班 === 100 === The Bismuth Antimony Telluride (BixSb2-xTe3) bulk, which x= 0.48-0.5 was the best thermoelectric material at room temperature in our work whereas the figure of merit (ZT) was approach 1. This compound can be used as either a cooling system or electrical generator. In this study, the powder metallurgy method was used to make the BixSb2-xTe3 bulks and its crystal structure was Rhombohedral characterized by XRD. Here, also we have studied the thermoelectric properties of the bulk (Seebeck coefficient, Thermal conductivity, and Resistivity) to enhance the figure of merit of BixSb2-xTe3 by Ce3Al doping. The experiment results show the BixSb2-xTe3 compound without doping slowly cooled from liquid to solid crystalline phase has higher Seebeck coefficient (S = 206 μV/K) than quenched (S = 183 μV/K) at 360 K. The other hand, we discovered that the resistivity of the bulk BixSb2-xTe3 decreased until 50% if we doped it by 0.5% Ce3Al but the Seebeck coefficient was not much difference with the compound without doping and finally, we got enhancement of ZT value from 0.96 to 1.106.