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The Bi2Te3, (Bi1‐xLax)2Te3 (x=0.002, 0.003) and Bi2(Te1‐yLay)3 (y=0.0015, 0.002) alloys were fabricated by mechanical alloying and vacuum hot pressing, and their thermoelectric properties were characterized. The Seebeck coefficient of vacuum hot pressed specimens doped with lanthanum was higher than that of Bi2Te3. The electrical conductivity was improved at specimens doped with relatively small amount of lanthanum improved than that of Bi2Te3. The maximal dimensionless figure of merit in Bi2(Te0.9985La0.0015)3 doped with relatively small amount of lanthanum was 0.48 at 473 K.
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