CAJ | 학술논문

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316 K上升到548 K时,电导率从7.6(10~4 S·m~(-1)下降到6.6(10~4 S·m~(-1).在438 K以上,热导率随温度上升逐渐增加,低于438 K时,热导率趋于稳定,约为0.86 W·(K·m)~(-1).无量纲热电优值ZT在548 K时取得最大值0.65,稍高于Ag_(0.365)Sb_(0.558)Te三元合金的0.61.与掺Ag的Ag_xBi_(0.5)Sb_(1.5-x)Te_3(x=0~0.4)合金相比,热电性能得到了改善.并再次讨论了Ag_xBi_(0.5)Sb_(1.5-x)Te_3合金中析出的第二相Ag-Sb-Te三元合金的作用机制.
채용방전등리자소결법(SPS)제비료삼원합금Ag0.405Sb0.532Te,병연구료타적수운성능,즉Seebeck계수、전도솔화열도솔.결과표명,당온도종316 K상승도548 K시,전도솔종7.6(10~4 S·m~(-1)하강도6.6(10~4 S·m~(-1).재438 K이상,열도솔수온도상승축점증가,저우438 K시,열도솔추우은정,약위0.86 W·(K·m)~(-1).무량강열전우치ZT재548 K시취득최대치0.65,초고우Ag_(0.365)Sb_(0.558)Te삼원합금적0.61.여참Ag적Ag_xBi_(0.5)Sb_(1.5-x)Te_3(x=0~0.4)합금상비,열전성능득도료개선.병재차토론료Ag_xBi_(0.5)Sb_(1.5-x)Te_3합금중석출적제이상Ag-Sb-Te삼원합금적작용궤제.
The ternary Ag_(0.405)Sb_(0.532)Te alloy was prepared by spark plasma sintering, and its transport properties involving Seebeck coefficients, electrical and thermal conductivities were evaluated. The results reveal that the electrical conductivity mildly decreases from 7.6(10~4 S·m~(-1) to 6.6(10~4 S·m~(-1) when the temperature increases from 316 K, to 548 K. Above 438 K, the thermal conductivity gradually increases with the increase of the temperature, and below 438 K, a relative stable value of about 0.86 W·K~(-1)·m~(-1) is obtained. The maximum thermoelectric figure of merit ZT is up to 0.65 at 548 K, a little higher than 0.61 of the ternary alloy Ag0.365Sb0.558Te. The thermoelectric properties have been improvement compared with the Ag-doped Ag_xBi_(0.5)Sb_(1.5-x)Te_3 alloys (x=0-0.4). The action mechanism of the second phase Ag-Sb-Te ternary alloy precipitated in the Ag_xBi_(0.5)Sb_(1.5-x)Te_3 alloys has been re-discussed.