Dielectric and magnetic characterization of the mixed system (BaTiO₃)_x(NiFe₂O₄)_1−x

Abstract

Ceramic composites of the mixed system (BaTiO₃)_x(NiFe₂O₄)_1−x (x = 1, 0.8, 0.65, 0.6, 0.5, 0.2, 0) have been prepared by hydrothermal synthesis and characterized through dielectric and magnetic measurements. It is shown that, when compared with the first-order phase transition of pure BaTiO₃, the ferroelectric response of this mixed system is dramatically smeared by the presence of ferrite and eventually disappears around x ≈ 0.65. The peak of the dielectric constant becomes increasingly smoothed with composition, also diminishing its maximum value as the frequency increases. Moreover, the magnetic behavior is not suppressed by the presence of the ferroelectric perovskite and just qualitative changes occur in the hysteresis parameters on the whole compositional range.

Keywords:

• multiferroics
• perovskite ceramics
• phase transitions

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors gratefully thank the Spanish MICINN [grant number FIS2012-36113-C03-1], [grant number MAT2013-40722-R].