Open AccessThermoelectric properties of nonstoichiometric Ag1－xPb18SbTe20 materials
Author(s) -
Yan Yong-Gao,
Xinfeng Tang,
Haijun Liu,
Liang Yin,
Qingjie Zhang
Publication year - 2007
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.56.3473
Subject(s) - spark plasma sintering , materials science , seebeck coefficient , thermoelectric effect , impurity , electrical resistivity and conductivity , scattering , thermal conductivity , phonon scattering , analytical chemistry (journal) , thermoelectric materials , sintering , electron mobility , phase (matter) , composite material , optoelectronics , optics , chemistry , thermodynamics , physics , organic chemistry , chromatography , electrical engineering , engineering
Ag1-xPb18SbTe20(x00.250.50.75) samples were prepared by melt-quench-spark plasma sintering(SPS). As the Ag content decreased, a second phase Sb2Te3 occurred in samples and the carrier concentration increased to 5×1018cm-3 and then ceased to increase as Ag content decreased further. The carrier mobility decreased first, and then increased, as the Ag content decreased. As temperature increased, the carrier scattering mechanism shifted gradually from ionized impurity scattering to acoustic phonon scattering. As the Ag content decreased, the electric conductivity increased while the Seebeck coefficient decreased, and the thermal conductivity show an increasing trend.