Enhanced permittivity and permeability of (1-y)(Mg0.95Zn0.05)2TiO4-yMg0.95Zn0.05Fe2O4 ceramics

We report the preparation of the solid-solutions (1-y)(Mg0.95Zn0.05)2TiO4-yMg0.95Zn0.05Fe2O4 (y = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) by traditional solid-state reaction and systematically study their phases, morphologies, and magnetodielectric properties. The giant dielectric constants are observed at low frequency in the ceramics, with y > 0.5 when the sintering temperature exceeds 1200 ℃. The highest relative permittivity ε' of 9.98 × 103 at 30 kHz and the largest squareness ratio of 0.89 for the magnetic hysteresis loop are achieved in 0.1MZT-0.9MZF. In addition, the enhanced initial permeability μi of ∼70 is obtained in 0.3MZT-0.7MZF due to its large grain size and probably the smaller magnetostriction and internal stress caused by lower relative density. All the results indicate that our solid-solutions with y > 0.5 can considerably improve the dielectric and magnetic properties, providing more advantages than the simple bi-phasic compounds in the applications for novel electronic devices.