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采用放电等离子烧结法(SPS)制备了三元合金Ag0.405Sb0.532Te,并研究了它的输运性能,即Seebeck系数、电导率和热导率。结果表明,当温度从316K上升到548K时,电导率从7.6×104S·m-1下降到6.6×104S·m-1。在438K以上,热导率随温度上升逐渐增加,低于438K时,热导率趋于稳定,约为0.86W·(K·m)-1。无量纲热电优值ZT在548K时取得最大值0.65,稍高于Ag0.365Sb0.558Te三元合金的0.61。与掺Ag的AgxBi0.5Sb1.5-xTe3(x=0～0.4)合金相比,热电性能得到了改善。并再次讨论了AgxBi0.5Sb1.5-xTe3合金中析出的第二相Ag-Sb-Te三元合金的作用机制。
The ternary alloy Ag0.405Sb0.532Te was prepared by spark plasma sintering (SPS) and its transport properties, ie Seebeck coefficient, conductivity and thermal conductivity, were investigated. The results show that the conductivity decreases from 7.6 × 104S · m-1 to 6.6 × 104S · m-1 when the temperature rises from 316K to 548K. Above 438K, the thermal conductivity increases with increasing temperature. Below 438K, the thermal conductivity tends to be stable at about 0.86W · (K · m) -1. The dimensionless thermoelectric figure of merit ZT achieves a maximum of 0.65 at 548K, slightly higher than the 0.61 of the Ag0.365Sb0.558Te ternary alloy. Compared with Ag-doped AgxBi0.5Sb1.5-xTe3 (x = 0-0.4) alloys, thermoelectric properties are improved. The mechanism of Ag-Sb-Te ternary alloy precipitated in AgxBi0.5Sb1.5-xTe3 alloy was discussed again.