Thermoelectric properties of Yb1-x (Er,Lu)x Al 3 solid solutions

Gloria J. Lehr, Donald T. Morelli

    Research output: Research - peer-reviewArticle

    • 10 Citations

    Abstract

    Ytterbium trialuminide (YbAl3) has one of the largest thermoelectric power factors of known materials below room temperature, making it a material of interest for low-temperature thermoelectric devices. However, the high thermal conductivity, which is due to a combination of a large electronic thermal conductivity and a moderately large lattice thermal conductivity, is detrimental to the figure of merit. Substitution of different atoms on the Yb site was performed in order to assess their ability to favorably alter the electronic structure and/or reduce the lattice thermal conductivity. We have synthesized and studied the thermoelectric properties of the solid solutions of YbAl3 with ErAl3 and LuAl3. Results for electrical conductivity, thermal conductivity and Seebeck coefficient for several of these solid solutions over the temperature range of 80 K to 300 K are reported. Although most substituted samples are driven toward a metallic state, we find that for some compositions the figure of merit is enhanced relative to pure YbAl3.

    LanguageEnglish (US)
    Pages1697-1701
    Number of pages5
    JournalJournal of Electronic Materials
    Volume42
    Issue number7
    DOIs
    StatePublished - Jul 2013

    Profile

    solid solutions
    thermal conductivity
    Solid solutions
    Thermal conductivity
    Temperature
    figure of merit
    ytterbium
    Seebeck effect
    substitutes
    electronic structure
    electrical resistivity
    room temperature
    coefficients
    electronics
    atoms
    temperature
    Ytterbium
    Seebeck coefficient
    Thermoelectric power
    Electronic structure

    Keywords

    • thermoelectric properties
    • trialuminides
    • YbAl

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Materials Chemistry

    Cite this

    Thermoelectric properties of Yb1-x (Er,Lu)x Al 3 solid solutions. / Lehr, Gloria J.; Morelli, Donald T.

    In: Journal of Electronic Materials, Vol. 42, No. 7, 07.2013, p. 1697-1701.

    Research output: Research - peer-reviewArticle

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