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Structural, magnetic and dielectric properties of the novel magnetic spinel compounds ZnCoSnO₄ and ZnCoTiO₄

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Ruiz León, Domingo and Mompean, Federico and Prado Gonja, Jesús and Marco, José F. and García Hernandez, Mar and Schmid, Rainer (2018) Structural, magnetic and dielectric properties of the novel magnetic spinel compounds ZnCoSnO₄ and ZnCoTiO₄. Journal of the european ceramic society, 38 (15). pp. 4986-4993. ISSN 0955-2219

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Official URL: http://dx.doi.org/ 10.1016/j.jeurceramsoc.2018.07.031


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Abstract

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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©Elsevier Science BV.
R.S. acknowledges a travel grant (Convenio Internacional) from the Universidad Complutense de Madrid to visit the USACH in Chile. JPG thanks the Spanish MINECO for granting a Juan de la Cierva fellowship. Spanish MINECO grant MAT2014-52405-C2-2- R is also acknowledged.

Uncontrolled Keywords:Sensitized solar-Cells; Hydrothermal method; Zinc stannate; Glass behavior; Zn₂SnO₄; Ceramics; Microwave
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:49873
Deposited On:28 Nov 2018 11:24
Last Modified:28 Nov 2018 11:54

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