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Author: search.filters.author.Charoonsuk, T.Subject: search.filters.subject.Ceria

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    Analysis of Sb-doped ceria: Magnetism, conductivity, dielectric, specific heat and optical properties
    (2019-02-01)
    Kolodiazhnyi, T.
    ;
    Charoonsuk, T.
    ;
    Spreitzer, M.
    ;
    Vittayakorn, N.
    We report on magnetism, charge transport, dielectric properties and specific heat of Ce<inf>1−x</inf>Sb<inf>x</inf>O<inf>2</inf> ceramics sintered at 1650 <sup>∘</sup>C with a final antimony content of 0 ≤ x ≤ 0.0017. In contrast to other donor dopants, such as Nb, Ta, U and W, charge compensation of antimony in Ce<inf>1−x</inf>Sb<inf>x</inf>O<inf>2</inf> does not involve the formation of the Ce<sup>3+</sup> ions as revealed by the magnetic susceptibility data. Therefore, we conclude that antimony is mainly present as Sb<sup>3+</sup> ion and acts as an acceptor dopant in Ce<inf>1−x</inf>Sb<inf>x</inf>O<inf>2</inf>. This conclusion is also supported by a very low electrical conductivity of the Sb-doped ceria that shows an activation energy E<inf>σ</inf> ∼ 0.97 eV. This activation energy is close to that observed in oxygen conducting acceptor-doped ceria and is significantly higher than the typical E<inf>σ</inf> ∼ 0.1–0.3 eV values reported for n-type CeO<inf>2</inf>. Below 10 K, both an anomaly in the dielectric loss and a small specific heat surplus in Sb-doped ceria indicate a low-energy dipolar relaxation probably associated with a local dynamics of the off-centered Sb<sup>3+</sup> point defects.