Improved magnetic and dielectric properties for NiZn ferrites by using cold sintering-assisted process

The rapid advancement of information technology has necessitated the development of materials with enhanced properties. NiZn ferrite is one of the focal points among this area due to its superior magnetic and dielectric properties; however, the sintering temperature is usually > 1200 °C. In this study, dense Ni 0.5 Zn 0.5 Fe 2 O 4 (NZFO) ceramics were synthesized by a cold sintering process (CSP) associated with a post heat treatment. The relative density for NZFO ceramics reaches a value of 97% when annealed at 1100 °C with saturation magnetization 79.3 emu/g and dielectric constant 22.1 at 1 MHz, which are higher than NZFO ceramics prepared by conventional sintering at 1100 °C. The improved performance for NZFO ceramics prepared by CSP-assisted process is ascribed to the higher density and fine microstructures. These findings suggest that cold sintering process technique holds promising potential for enhancing the performance of ferrite ceramics.