采用熔融-淬火-放电等离子体烧结制备了Ag偏离化学计量比Ag1-xPb18SbTe20(x=0,0.25,0.50,0.75)样品,研究了Ag含量对样品热电传输性能的影响.结果表明,随Ag含量降低,样品中出现少量第二相Sb2Te3,样品载流子浓度增加到5×1018cm-3后不再增加.样品载流子迁移率随Ag含量降低先降低后增加,随着温度增加,载流子散射机理由电离杂质散射转变为声学波散射.随Ag含量降低,样品电导率增加而Seebeck系数降低,热导率增加. The Ag deviations from the stoichiometric ratio Ag1-xPb18SbTe20 (x = 0,0.25,0.50,0.75) were prepared by melt-quench-discharge plasma sintering. The effect of Ag content on the thermoelectric properties was investigated. The results showed that with the Ag content , The second phase Sb2Te3 appears in the sample, the sample carrier concentration does not increase after increasing to 5 × 1018cm-3.The carrier mobility decreases first and then increases with the decrease of Ag content, and as the temperature increases, the carrier current The scattering mechanism changes from ionized impurity scattering to acoustic wave scattering. With the decrease of Ag content, the sample conductivity increases and the Seebeck coefficient decreases, and the thermal conductivity increases.