TITLE

Thermoelectric properties of a clathrate compound Ba[sub 8]Cu[sub 16]P[sub 30]

AUTHOR(S)
Huo, Dexuan; Sasakawa, Tetsuya; Muro, Yuji; Takabatake, Toshiro
PUB. DATE
April 2003
SOURCE
Applied Physics Letters;4/21/2003, Vol. 82 Issue 16, p2640
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report the electrical resistivity (ρ), thermoelectric power (S), thermal conductivity (κ), and specific heat (C) for the clathrate compound Ba[SUB8]Cu[SUB16]P[SUB30], in which polyhedral cages are composed of Cu and P atoms. Being in contrast to the n-type conduction in most of clathrate compounds, a p-type metallic conduction in this compound is indicated by the positive S, which monotonically increases up to 65 μV/K at 460 K. The analysis of C(T) gives indirect evidence for low-frequency local vibrations of Ba atoms with two Einstein temperatures 120 and 90 K, respectively. These local vibrations lead to a low lattice thermal conductivity of 2.9 W/K m at 300 K. The combination of the metallic resistivity, large thermoelectric power, and low thermal conductivity, makes this compound be a prospective thermoelectric material.
ACCESSION #
9518386

 

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