Novel development of low-loss MnZn ferrites by sintering process optimisation and CaTiO3 doping

Renewable energy systems such as solar inverters increasingly require efficient and compact components. This drives the need for MnZn ferrites with low power loss and high permeability at high frequencies. This study addresses this challenge by optimising the sintering process and introducing CaTiO 3 through a novel doping method. A higher heating rate and shorter sintering period refined the grain size, which was further enhanced by CaTiO 3 doping. This microstructural improvement reduced eddy current loss and increased cut-off frequency. With the addition of 1200 ppm CaTiO 3 , MnZn ferrites achieved minimal power loss of under 130 mW/cm 3 at 1 MHz/30 mT and 300 mW/cm 3 at 3 MHz/10 mT over the temperature range of -20 °C to 100 °C. Sintering temperature was successfully lowered to 1150 °C with only 30 minutes of holding time, promoting energy savings and sustainability. The combined sintering and doping strategy effectively improved electromagnetic properties, offering a scalable route for producing high-performance MnZn ferrites suitable for next-generation high-frequency applications.