Abstract
Direct solid state synthesis by hot pressing has been applied in order to produce high efficiency <TEX>$Zn_4Sb_3$</TEX> bulk specimens. Single phase <TEX>$Zn_4Sb_3$</TEX> 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 <TEX>$Zn_4Sb_3$</TEX> 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.
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