Microstructure and properties of Ni-Zn ferrites sintered from slip cast colloidally precipitated particles

摘要

The microstructural dependence of magnetic permeability and magnetic loss of Ni-Zn ferrites sintered from split-cast colloidally precipitated ultrafine particles was investigated. A low-loss Ni-Zn ferrite (tan delta / mu /sub 0/=4.92*10/sup -5/ at 1 MHz) having nearly maximum attainable density, fairly uniform and small grain size, and no significant zinc loss was prepared by sintering at 1100 degrees C. There was considerable discrepancy in the permeability-grain size relationship between ferrites sintered at >or=1100 degrees C and at <1100 degrees C. The zinc loss and intragranular pores in 1100 degrees C sintered ferrites may explain this discrepancy.