Properties of sintered n-type (Bi0.95Sb0.05)2(Te0.95Se0.05)3 and p-type (Bi0.2Sb0.8)2Te3 tellurides

Juha Hassel, Jyrki Tervo

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    Properties of Spark Plasma Sintered (SPS) and Hot Isostatically Pressed (HIP) n- and p-type tellurides were studied. Composition of n-type powder was (Bi0.95Sb0.05)2(Te0.95Se0.05)3 and p-type (Bi0.2Sb0.8)2Te3. The powder material composition is essentially the same as presented by Vasilevskiy et al, 2010. SPS sintering was conducted in high vacuum at 673 K and 48 MPa with 1 minute holding time. Consolidation of HIP samples was done at 573 K at 100 MPa for 120 minutes. Charge carrier densities and mobilities were measured at room temperature. Electrical conductivity, thermal conductivity and Seebeck coefficient was measured in temperature range of 300 K - 520 K. Effort was made to fit data into a transport model. Especially, the aim was to gain understanding on the effect of sintering method on scattering mechanisms of tellurides and corresponding consequences on thermoelectric figures of merit. Based on this, material optimization issues on powder-based sintered materials are discussed.
    Original languageEnglish
    Title of host publicationICT/ECT 2012, The 31st International & 10th European Conference on Thermoelectrics, July 9th-12th, 2012, Aalborg, Denmark
    Subtitle of host publicationBook of Abstracts
    Place of PublicationAalborg, Denmark
    PublisherAalborg University
    Publication statusPublished - 2012
    MoE publication typeNot Eligible

    Keywords

    • plasma spray
    • thermoelectrics
    • oxides

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