Abstract

Direct solid state synthesis by hot pressing has been applied in order to produce high efficiency Zn_4Sb_3 bulk specimens. Single phase Zn_4Sb_3 with 98.5% of theoretical density was successfully produced by direct hot pressing of elemental powders containing 1.2 at.% excess Zn. Thermoelectric properties as a function of temperature were investigated from room temperature to 600 K and compared with results of other studies. Transport properties at room temperature were also evaluated. Thermoelectric properties of single phase Zn_4Sb_3 materials produced by direct synthesis were measured and are comparable to the published data. Direct solid state synthesis by hot pressing provides a promising processing route in this material.

• Keywords: Direct syntheses;Thermoelectric;Hot pressing;Phase transformation;Zn_4Sb_3;