Title :
Microstructure and properties of Ni-Zn ferrites sintered from slip cast colloidally precipitated particles
Author :
Tseng, T.Y. ; Lin, J.C.
Author_Institution :
Inst. of Electron., Nat. Chiao-Tung Univ., Hsinchu, Taiwan
fDate :
11/1/1989 12:00:00 AM
Abstract :
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 δ/μ0=4.92×10-5 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°C. There was considerable discrepancy in the permeability-grain size relationship between ferrites sintered at ⩽1100°C and at >1100°C. The zinc loss and intragranular pores in 1100°C sintered ferrites may explain this discrepancy
Keywords :
X-ray diffraction examination of materials; crystal microstructure; ferrites; grain size; magnetic leakage; magnetic permeability; magnetic properties of fine particles; nickel compounds; scanning electron microscope examination of materials; sintering; zinc compounds; 1 MHz; 1100 degC; Ni0.5Zn0.5Fe2O4; SEM; X-ray diffraction; ferrites; grain size; intragranular pores; magnetic loss; magnetic permeability; microstructural dependence; sintering; split-cast colloidally precipitated ultrafine particles; Casting; Etching; Ferrites; Grain size; Microstructure; Powders; Rheology; Scanning electron microscopy; Temperature; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
