Relative temperature coefficient of initial permeability
2.
Alternating - current initial permeability
3.
The raw materials , the composition , the time of milling , the calcining temperature , the different additives , the sintering temperature and the sintering parameters were investigated . the result showed : it was advantaged to obtain high initial permeability mnzn ferrite with stable frequency characteristic using high - purity raw materials ; in order to obtain mnzn ferrite with high properties , we must control strictly the composition ; it could improve the properties of mnzn ferrite by optimizing calcining temperature . the lower calcining temperature made the permeability higher , and the higher calcining temperature could promote the frequency characteristic of permeability ; we chosen the right time of milling according to the requirement of power diameter ; in order to improve the properties of mnzn ferrite , it is necessary to add effective additives . in this dissertation , the influence of bi2o3 �� moo3 �� k2co3 �� co2o3 were investigated ; the sintering temperature , the time of heat - retaining and sintering parameters were the key factors of preparing high permeability mnzn ferrites
4.
We emphatically discussed how the sintering environment affected initial permeability ( ui ) , and how different contents of zno varied saturation magnetization ( bs ) and curie temperature ( tc ) . the factors of affecting temperature stability of ferrites were analyzed . finally , we compared sol - gel auto - combustion way with conventional ceramic method
5.
Thinning the crystal grain and increasing the center vent are effective approach to raise the limiting frequency of high permeability mnzn ferrite . through large quantities of experiments , we made progress in raising limiting frequency of high permeability mnzn ferrite . we prepared the broad band mnzn ferrite of which the initial permeability was 10000
6.
In this dissertation , high permeability mn - zn ferrites have been prepared by the mixed - oxide route , using mn3o4 , fe2o3 and zno as the raw materials . and in this dissertation we study deeply on the preparation technology and mechanism of high initial permeability mnzn ferrite with better stability of which the initial permeability was 10000
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