%0 Journal Article
%A Ruiz León, Domingo
%A Mompean, Federico
%A Prado Gonjal, Jesús De La Paz
%A Marco, José F.
%A García Hernandez, Mar
%A Schmid, Rainer
%T Structural, magnetic and dielectric properties of the novel magnetic spinel compounds ZnCoSnO₄ and ZnCoTiO₄
%D 2018
%@ 0955-2219
%U https://hdl.handle.net/20.500.14352/12282
%X The transparent semiconductor Zn₂SnO₄ with cubic spinel structure and the isostructural Zn₂Ti₄O have been magnetically doped with Co^(2++) ZnCoSnO₄ and ZnCoTiO₄ exhibit ferrimagnetism below TN ≈ 13 K and TN ≈ 17 K. Ferrimagnetic moments are evident in M vs H curves below TN by  small hysteresis. Fits to strictly linear Curie-Weiss plots above TN give  µ_(eff) ≈ to 4.86 µ(B) and a ≈  to 4.91 µB for ZnCoSnO₄ and ZnCoTiO₄, above theoretical predictions. Impedance spectroscopy data from sintered ceramic can be fitted with a standard equivalent circuit model based on two RC elements for bulk and GB areas. The relative dielectric permittivity of the bulk is ≈ 20 and ≈  to 30 for Zn₂SnO₄ and Zn₂TiO₄. The semiconducting ZnCoSn SnO₄ and ZnCoTiO₄ceramics exhibit bulk resistivity of ≈ to 1 10⁶Ω cm and ≈ to 1 10⁵ Ωcm at 560 K (287°C), and bulk activation energies of EA ≈ to 1.2 eV and 1.1 eV.
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