热压工艺参数对n型和p型Bi2Te3基赝三元热电材料电学性能的影响

通过熔炼/研磨/热压方法制备了n型和p型赝三元Bi₂Te₃基的热压合 金样品，测量了由不同工艺参数(热压温度、热压压力)制备的样品Seebeck系数和电导率.分析了热压参数对热电性能产生的影响.特别是发现了增加热压压力和热压温度会使n型和p型热压样品的Seebeck系数和电导率都有所提高，这与单晶和取向晶体材料的Seebeck系数和电导率变化趋势相反的规律显然不同，其结果对热压样品的电学性能提高有积极的影响. 关键词： 热电材料 热压 Seebeck系数 工艺参数

Influence of process parameters on the electrical properties of n-type and p-type Bi2Te3-based pseudo-ternary thermoelectric materials by the hot-pressing method

Seebeck coefficient and electrical conductivity of the N-type and P-type Bi ₂Te₃-based alloys prepared by melting/grinding/hot-pressing met hod for different process parameters (temperature and pressure of hot-pressing)were measured,and the effects of process parameters were analyzed.It has been found that the temperature and pressure of hot-pressing play very important roles in enhancing both Seebeck coefficient and electrical conductivity of the Bi₂Te_{3-based alloys.The phenomena are different from those of Bi2Te3 single cry stal and its oriented crystal in the electrical properties.Better electrical properties may be obtained.}