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Author: search.filters.author.Vittayakorn, NaratipSubject: search.filters.subject.alkali titanate

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    Giant dielectric constants in K0.8M0.4Ti1.6O4 (M = Ni, Zn) lepidocrocite-type layered titanate ceramics
    (2019-01-02)
    Maluangnont, Tosapol
    ;
    Vittayakorn, Naratip
    We reported herein the temperature-dependent dielectric properties of K<inf>0.8</inf>M<inf>0.4</inf>Ti<inf>1.6</inf>O<inf>4</inf> (M = Ni, Zn) lepidocrocite titanate ceramics at the frequency f of 10<sup>3</sup>, 10<sup>4</sup> and 10<sup>5</sup> Hz. This titanate is an example of layered alkali titanium oxides possessing two-dimensional (2D) sheets of edge-shared TiO<inf>6</inf> octahedra, in contrast to other widely studied materials with mostly corner-shared TiO<inf>6</inf> motifs. The giant dielectric constants ε′ ∼10<sup>4</sup> and the dielectric losses tan δ ∼ 0.5–2 were obtained upon heating from RT to 250 °C. These values in our water-free ceramics are comparable to those previously reported in lepidocrocite titanate and related structures containing up to 15%wt water. The results were explained considering (i) Maxwell-Wagner polarization of interlayer species, and (ii) the possible formation of internal barrier layer capacitors (IBLCs) via the oxidized surfaces.