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Mechanical alloying followed by pulse discharge sintering (MA-PDS) has been employed to develop the bulk (Bi 1-x Sb x ) 2 Te 3 thermoelectric materials with various Sb alloying contents. Substitutional solid solutions of (Bi 1-x Sb x ) 2 Te 3 are formed in the whole Sb content range by MA-PDS process. The sintered compacts are dense and have refined microstructures. Systematic investigations on the electrical, thermal and thermoelectric properties reveal that the transport properties of the obtained (Bi 1-x Sb x ) 2 Te 3 samples are quite sensitive to the Sb alloying content. At room temperature, the samples with x 0.57, the samples become p-type. The pure constituents of Bi 2 Te 3 and Sb 2 Te 3 as well as the Sb-poor, n-type samples exhibit the room-temperature figure of merit of the order of 1.0 x 10 - 3K -1 . High values of figure of merit have been obtained in the Sb-rich, p-type samples. The maximum value of 3.35 x 10 -3 K -1 is attained at x = 0.80, which corresponds to the carrier concentration and Hall mobility of 1.95 x 10 19 cm -3 and 207 cm 2 /Vs, respectively.

materials transactions

Structure and Transport Properties of (Bi&lt;SUB&gt;1-x&lt;/SUB&gt;Sb&lt;SUB&gt;x&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;Te&lt;SUB&gt;3&lt;/SUB&gt; Thermoelectric Materials Prepared by Mechanical Alloying and Pulse Discharge Sintering