Thermoelectric properties of CeAl sub(3) prepared by hot-press method

We present data on the heavy fermion compound CeAl sub(3) as a potential p-type thermoelectric material at cryogenic temperatures. Samples of CeAl sub(3) were synthesized by arc-melting, ball milling and hot pressing the nano-powder at different temperatures. Thermal conductivity ([kappa]), Seebeck...

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Bibliographic Details
Published inEnergy conversion and management Vol. 87; pp. 584 - 588
Main Authors Pokharel, Mani, Dahal, Tulashi, Ren, Zhensong, Czajka, Peter, Wilson, Stephen, Ren, Zhifeng, Opeil, Cyril
Format Journal Article
LanguageEnglish
Published 01.11.2014
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Summary:We present data on the heavy fermion compound CeAl sub(3) as a potential p-type thermoelectric material at cryogenic temperatures. Samples of CeAl sub(3) were synthesized by arc-melting, ball milling and hot pressing the nano-powder at different temperatures. Thermal conductivity ([kappa]), Seebeck coefficient (S), electrical resistivity ([rho]) and Hall coefficient (R sub(H) of the samples were measured at temperatures ranging from 5 to 330 K. The thermoelectric properties of this compound are highly dependent on the hot-pressing (HP) temperature. The thermal conductivity increases with increase in HP temperature which is compensated by increased power factor (S super(2)[rho] super(-1 )). As a result the samples with higher HP temperatures exhibit higher ZT values. The highest ZT value of 0.016 at 55 K was observed for the sample hot-pressed at 800 [degrees]C. The Hall coefficient data reflects an increase in carrier concentration and a decrease in carrier mobility with decreasing hot pressing temperature.
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ISSN:0196-8904
DOI:10.1016/j.enconman.2014.07.050