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|Title:||Evaluation of (Bi<sub>0.25</sub>Sb<sub>0.75</sub>)<sub>2</sub> Te<sub>3</sub> charge transport parameters formed by hot press sintering|
Scanning probe microscopy (SPM)
|Abstract:||<i style="">P</i>-type (Bi<sub>0.25</sub>Sb<sub>0.75</sub>)<sub>2</sub>Te<sub>3</sub> thermoelectric crystal has higher figure of merit <i>Z</i> than other stoichiometries. The prepared crystal of this compound is pulverized in a particle size ratio of 64% with mesh 80 (200 <img src='/image/spc_char/micro.gif' border=0> m<sup>2</sup>)/36% with a mesh of 60 (250 <img src='/image/spc_char/micro.gif' border=0> m<sup>2</sup>). 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 <i>Z</i> value of around 1.92×10<sup>-3</sup> K<sup>-1</sup>.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.18(2) [April 2011]|
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