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Media type:
E-Article
Title:
High Seebeck coefficient AMXP2 (A = Ca and Yb; M, X = Zn, Cu and Mn) Zintl phosphides as high-temperature thermoelectric materials
Contributor:
Ponnambalam, V;
Lindsey, S;
Xie, W;
Thompson, D;
Drymiotis, F;
Tritt, Terry M
imprint:
IOP Publishing, 2011
Published in:Journal of Physics D: Applied Physics
Language:
Not determined
DOI:
10.1088/0022-3727/44/15/155406
ISSN:
1361-6463;
0022-3727
Origination:
Footnote:
Description:
<jats:p>Resistivity (ρ), Seebeck coefficient (α) and thermal diffusivity of the title compounds CaZn<jats:sub>2</jats:sub>P<jats:sub>2</jats:sub>, YbZn<jats:sub>2</jats:sub>P<jats:sub>2</jats:sub>, YbCuZnP<jats:sub>2</jats:sub> and YbMnCuP<jats:sub>2</jats:sub> are measured over a temperature range 300–1000 K to evaluate the thermoelectric potential of these materials. The temperature dependence of ρ and α of these light weight and less explored Zintl phosphides is similar to that of a degenerate semiconductor. While the electrical transport properties ρ and α are strongly composition dependent, thermal conductivity (κ) calculated from thermal diffusivity is remarkably low in the range 1.1–2.5 W m<jats:sup>−1</jats:sup> K<jats:sup>−1</jats:sup> at 1000 K. Room-temperature Hall resistance measured on selected samples suggests that holes dominate in the transport. The best composition appears to be YbZnCuP<jats:sub>2</jats:sub> which has the combination of ρ ∼ 2.4 mΩ cm, α ∼ 160 µV K<jats:sup>−1</jats:sup> and κ ∼ 1.7 W m<jats:sup>−1</jats:sup> K<jats:sup>−1</jats:sup> at 1000 K resulting in a <jats:italic>ZT</jats:italic> value of ∼0.6.</jats:p>