Abnormal Crystal Growth in the Sintered (Bi0.2Sb0.8)2Te3 Alloys Induced by Silver Addition

Hyun Jae Yoo; Yong Ho Park; Ik Min Park

doi:10.4028/www.scientific.net/MSF.449-452.237

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Abnormal Crystal Growth in the Sintered (Bi_0.2Sb_0.8)₂Te₃ Alloys Induced by Silver Addition
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HomeMaterials Science ForumMaterials Science Forum Vols. 449-452Abnormal Crystal Growth in the Sintered...

Abnormal Crystal Growth in the Sintered (Bi_0.2Sb_0.8)₂Te₃ Alloys Induced by Silver Addition

Abstract:

The bulk (Bi_0.2iSb_0.8)₂Te₃ thermoelectric alloys added with Ag up to 2.0 mass% were prepared by mechanical alloying and pulse discharge sintering (MA-PDS). Microstructures of the sintered samples were investigated. In the two samples with 1.0 and 2.0 mass% Ag, an abnormal growth of the (Bi,Sb)₂Te₃ phase, manifested by the formation of coarse crystals that are visible with eye, has been revealed during the PDS process of the alloyed powders. The local temperature rise in the compact induced by the compositional fluctuation as a result of Ag addition was suggested to be responsible for the observed abnormal growth. In addition, the electrical transport properties, i.e., electrical resistivity and Seebeck coefficient, of the sintered samples were studied.