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  • Thermoelectric properties of pseudobrookite-based ceramics prepared from natural Fe-Ti-rich heavy mineral sand concentrate
    Daneu, Nina ...
    Pseudobrookites (Fe2TiO5-FeTi2O5) are promising candidates for high-temperature oxide thermoelectrics. In this work, we used natural Fe-Ti-rich heavy mineral sand (HMS) as an abundant and ... environmentally friendly raw material for the preparation of pseudobrookite-based ceramics. The main components of the initial powder were ilmenite (FeTiO3) and pseudorutile (Fe2Ti3O9) with various degrees of alteration. Pre-oxidation of the as-received powder was used for modification of the Fe2+:Fe3+ ratio and exsolution of rutile. The starting powders were densified by conventional sintering (CS; 1200 °C, 5 h, pressureless) and spark plasma sintering (SPS; 1100 °C, 5 min, 150 MPs) in argon. The thermoelectric properties of the sintered compacts depend mainly on the Fe:Ti ratio, the Fe2+:Fe3+ ratio, and the fraction and distribution of rutile in the microstructures. The samples exhibit comparable properties as the pseudobrookite-based ceramics prepared from high-purity chemicals indicating that, with some further optimization, natural Fe-Ti-rich HMS are an interesting alternative for the preparation of pseudobrookite-based ceramics for thermoelectric applications.
    Vir: Journal of the European ceramic society. - ISSN 0955-2219 (Vol. 43, iss. 16, Dec. 2023, str. 7500-7507)
    Vrsta gradiva - članek, sestavni del
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 160364803

    Povezava(-e):

    Repozitorij Univerze v Ljubljani – RUL
    DOI

vir: Journal of the European ceramic society. - ISSN 0955-2219 (Vol. 43, iss. 16, Dec. 2023, str. 7500-7507)
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