Dielectric and magnetic properties of BaTiO3/Ni0.5Zn0.5Fe2O4 composite ceramics synthesized by a co-precipitation process

• BT coated by NZFO (BNCP) has been successfully prepared.
• The outer BT phase could inhibit the grain growth of NZFO in the composites.
• This structure is help to get the uniform ferromagnetic-ferroelectric composites.
• BNCP composites with NZFO:BT (1.5:1) shows the best comprehensive performance.

In this paper, we report the preparation of BaTiO3(BT)/Ni0.5Zn0.5Fe2O4(NZFO) ceramics which own the microstructure of BT coated by NZFO through the co-precipitation procedure (BNCP). X-ray diffraction measurements are used to demonstrate the phase change with different molar ratio of NZFO:BT, and their dielectric and magnetic properties of the composite has been investigated by a RF Impedance/Material Analyzer and M–H loop measurement. The results indicate that the BNCP composite ceramics with NZFO:BT molar ratio at 1.5:1 owns the largest Q (the quality factor) and product of μi × Q and shows nice comprehensive performance in multiferroic field. In addition, this inner BT phase endow the ceramic composites higher cut-off frequency fr and broaden the frequency scope of the composites with higher permeability which could greatly benefit its application.