Structural, magnetic and dielectric properties of the novel magnetic spinel compounds ZnCoSnO4 and ZnCoTiO4. Issue 15 (December 2018)

• Record Type: Journal Article
• Authors: Ruiz-León, Domingo; Mompean, Federico; Prado-Gonjal, Jesús; Marco, José F.; García-Hernandez, Mar; Schmidt, Rainer
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 15(2018)
• Page Start: 4986
• Page End: 4993
• Publication Date: 2018-12
• Subjects: Transparent semiconductors -- Ferrimagnetism -- Ceramic -- Synthesis -- Dielectric -- Properties -- Spinel; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.07.031
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The transparent semiconductor Zn2 SnO4 with cubic spinel structure and the isostructural Zn2 TiO4 have been magnetically doped with Co 2+ . ZnCoSnO4 and ZnCoTiO4 exhibit ferrimagnetism below T N ≈ 13 K and T N ≈ 17 K. Ferrimagnetic moments are evident in M vs H curves below T N by small hysteresis. Fits to strictly linear Curie-Weiss plots above T N give μ eff ≈ 4.86 μB and ≈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 ≈30 for Zn2 SnO4 and Zn2 TiO4 . The semiconducting ZnCoSnO4 and ZnCoTiO4 ceramics exhibit bulk resistivity of ≈1 10 6 Ω cm and ≈1 10 5 Ω cm at 560 K (287 °C), and bulk activation energies of E A ≈ 1.2 eV and 1.1 eV.