Thermogravimetric analysis of ferrite MFe(2)o(4) with hydrogen reduction and preparation condition of oxygen-deficient MFe2O4-8

Reduction behavior of ferrite mfe2o4(m=fe, mn, co, ni) with spinel structure prepared by various methods were studied by non-isothermal reduction (298-843k) and isothermal reduction thermal weight loss analysis. the effect of the preparation methods, the particle size and the specific sur face area on the reduction behavior were also discussed. the velocity of activating and oxygen-loss were measured quantitatively according to the weight loss of ferrite during the process of non-isothermal and isothermal reduction. the optimum temperature and time of preparation of ferrite mfe2o4-delta(0 < delta < 1) were obtained.