Open AccessThermoelectric properties of the Bi2Te3 nanocrystalline bulk alloy pressed by the high-pressure sintering
Author(s) -
Wu Fang,
Wei Wang
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.047201
Subject(s) - materials science , sintering , nanocrystalline material , thermoelectric effect , seebeck coefficient , scanning electron microscope , grain size , thermal conductivity , hot pressing , electrical resistivity and conductivity , alloy , thermoelectric materials , composite material , metallurgy , nanotechnology , physics , thermodynamics , engineering , electrical engineering
Bi2Te3 nanowires and nanoparticles are synthesized by hydrothermal method, and the nanopowders are pressed into bulk pellets by high-pressure sintering or vacuum hot-pressed. The scanning electron microscope (SEM) results and thermal properties of such bulk samples are compared. The SEM result shows that the grain size of the high-pressure sintering sample is much smaller than that of the hot-pressed sample. The thermal properties show that the electrical resistivity, Seebeck coefficient, and thermal conductivity of the high-pressure sintering sample are all better than those of the hot-pressed sample. The ZT value of the high-pressure sintering sample prepared by nanowires reaches 0.5 at room temperature, which is much higher than that of the hot-pressed sample. Therefore the high-pressure sintering provides an effective method to press nanopowders to bulk.