PREPARATION OF FERRITE BY HIGH-ENERGY MECHANICAL MILLING

Spinel ferrite ZnFe ₂O ₄powders were synthesized directly from ZnO and α-Fe ₂O ₃mixtures by high-energy mechanical milling(HEMM). BaZn ₂Fe ₁₆O ₂₇(Zn ₂-W) ferrite powders were prepared by HEMM and subsequent heat treatment using the mixture of BaO,Zno and α-Fe ₂O ₃. X-ray diffraction (XRD) was used to investigate phase structure of powder obtained from the chemical reaction processing at different milling time. It has been found that the solid reactions between metal oxides take place step by step. Grain sizes of ZnFe ₂O ₄are less than 10nm. Ultrafine BaZn ₂Fe ₁₆O ₂₇(Zn ₂-W) ferrite powder (100nm~200nm) has been synthesized by HEMM and subsequent heat beatment.