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.