MnZn-Ferrites via Mechanical Alloying of Elemental-Oxides

抄録

  We have produced MnZn-ferrite via high-energy ball-milling of the elemental oxides MnO, ZnO, and Fe₂O₃. X-ray diffraction indicates a pure phase spinel forms after 1250 min. of ball-milling, with all diffraction peaks being indexed to the fd3m space group having a lattice parameter 8.422 Å(8.429Å after 2400 min. milling). Extended x-ray absorption fine structure (EXAFS) analysis reveals that the conversion of metal ions from their elemental oxide structures to the spinel phase occurs nearlinear with milling time with 50% of the oxides converted after approximately 500 minutes. Multiple-scattering EXAFS modeling indicates an increase in the inversion parameter for the milled ferrite with a abnormally high fraction of Zn cations residing on the B sublattice.