Open AccessMicrostructure and themoelectric properties of p-type filled skutterudite Ce0.3Fe1.5Co2.5Sb12 prepared by melt-spinning method
Author(s) -
Guo Quan-sheng,
Li Han,
Su Xian-Li,
Xinfeng Tang
Publication year - 2010
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.59.6666
Subject(s) - skutterudite , materials science , spark plasma sintering , microstructure , thermoelectric effect , melt spinning , composite material , crystallite , seebeck coefficient , thermal conductivity , thermoelectric materials , spinning , metallurgy , thermodynamics , physics
Polycrystalline nanostructured bulk samples of p-type filled skutterudite Ce0.3Fe1.5Co2.5Sb12 have been prepared by melt-spinning (MS) method combined with spark plasma sintering (SPS). The effects of melt-spinning process on their microstructure and thermoelectric properties have been investigated. The results indicate that the ribbons have finer microstructure with the increasing cooling rate for melt-spun ribbons, resulting from the increasing copper wheel speed and decreasing ejection pressure. Compared with the sample prepared by traditional method, the samples prepared by MS-SPS method have higher power, factor due to the enhanced thermopower, despite the slightly reduced electrical conductivity. Meanwhile, the lattice thermal conductivity of the MS-SPS samples is significantly suppressed. Hence, the thermoelectric performance of the MS-SPS samples is greatly improved, and the figures of merit reach about 0.55 at 750 K.