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Title: Evaluation of (Bi0.25Sb0.75)2 Te3 charge transport parameters formed by hot press sintering
Authors: Kavei, G
Keywords: Sintering;Hot pressing;Thermal conductivity;Scanning probe microscopy (SPM);Transport parameters
Issue Date: Apr-2011
Publisher: NISCAIR-CSIR, India
Abstract: P-type (Bi0.25Sb0.75)2Te3 thermoelectric crystal has higher figure of merit Z than other stoichiometries. The prepared crystal of this compound is pulverized in a particle size ratio of 64% with mesh 80 (200 m2)/36% with a mesh of 60 (250 m2). The powder is sintered in a heat up to 350-500ºC under pressing load of 500 MPa (hot pressing). The method comprehension on transport parameters of the compound systematically investigated in nano-scale intrinsic structures by systems of X-ray diffraction, scanning electron microscopy and atomic force microscopy. The obtained data determined homogeneous structures for hot pressed samples along longitudinal and transversal directions. Thermal and electrical conductivities at optimum sintering temperature lead to a maximum Z value of around 1.92×10-3 K-1.
Page(s): 161-167
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(2) [April 2011]

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