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Influence of Applied Pressure Load and Holding Time on Microstructure and Thermoelectric Properties of p‐Type Bi 2 Te 3 Alloys
Author(s) -
Madavali Babu,
Kim HyoSeob,
Lee KapHo,
Son HyeonTaek,
Hong SoonJik
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12482
Subject(s) - materials science , microstructure , thermoelectric effect , grain size , heat load , gas pressure , grain growth , metallurgy , seebeck coefficient , composite material , thermodynamics , thermal conductivity , physics , petroleum engineering , engineering
In this research, the effects of applied pressure load and holding time on microstructure and thermoelectric properties of p‐type Bi 2 Te 3 + 75%Sb 2 Te 3 alloys were studied. Besides this, the microstructural changes during the heat treatment of gas‐atomized ( GA ) powders were examined. The grain growth (12.5–25 μm) was observed with increasing of the holding time of the heat‐treated GA powders. The hot‐pressed bulks showed grain refinement behavior with increasing pressure load, whereas grain size was found to slightly increase with increasing holding time. The peak power factor value, 3.48 W/mK 2 , was obtained for the hot‐pressed sample at 420°C with pressure load of 530 MPa.