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The effect of dopant and low oxygen partial pressure during sintering on the magnetic properties of MnZn ferrites for use in high frequency power supplies was studied. A low partial pressure of oxygen in the sintering atmosphere and a proper temperature profile during sintering decrease the average grain size, while the dopant, which segregates to the outer gain region, increases the grain boundary resistivity resulting in a lowering of power loss.doi:10.1051/jp4:1997135 fatcat:2y5lkaknwrgytk23yjp4w3hm4i