Neutron diffraction study of ferrite powders prepared by combustion synthesis

The NixZn1-xFe2O4 ferrites prepared by SHS method at high oxygen partial pressure of 5.0 MPa were analyzed by neutron diffractometry and vibrating sample magnetometry. The final stoichiometries of the powders were Ni0.33Zn0.67Fe2O4 and Ni0.36Zn0.64Fe2O4, respectively, which supports that reaction mechanism involves the competitive redox reaction of zinc oxide, nickel oxide and iron. The coercive force and residual magnetization decreased, whereas, the maximum magnetization, susceptibility and curie temperature increased with oxygen pressure. The magnetic property changes was related to non-stoichiometric numbers of the ferrites due to the competitive reduction reaction during the combustion reaction