[9p-W351-1~12] 9.4 Thermoelectric conversion

[9p-W351-9] Thermoelectric Properties of Y- and Te-doped Mg₃Sb₂ Synthesized by SPS Method

〇Junichi Tani¹, Tsutomu Sinagawa¹, Masaya Chigane¹ (1.ORIST)

Keywords:thermoelectric materials, spark plasma sintering, impurity doping

Dense Mg₃Sb₂ sintered samples were successfully fabricated directly from a powder mixture of Mg, Sb and a small amount of Y₂O₃ or Te, by spark plasma sintering method. Doping of Y and Te into Mg₃Sb₂ was successfully achieved, and the samples doped with Y and Te showed n-type. Because the electron density of Y-doped Mg₃Sb₂ at room temperature is higher than that of Te-doped sample, the solubility limit of Y in Mg₃Sb₂ is estimated to be higher than that of Te. Both Y- and Te-doped Mg₃Sb₂ show the maximum values of dimensionless thermoelectric figure of merit (ZT) of 1.0 at about 773 K.