| 摘要 |
PURPOSE:To keep a negative temperature coefficient and improve its density by adding a small amount of MnO2 to a material which has a negative temperature coefficient of initial permeability. CONSTITUTION:To the composition, expressed by a chemical formula NixCoyFez O4 (where 0.8<=x<=1.2, 0.01<=y<=0.03, 1.8<=z<=2.2 and x+y+z=3), 2-4wt% of Bi2O3, 0.2-3wt% of SiO2 and 0.005-0.04 (expression of above chemical formula) of MnO2 are added and baked. The material to which MnO2 is added has a temperature coefficient of initial permeability which is uniformly negative in the range of 0-80 deg.C and has an improved density so that the strength of the product is improved. |
