Low temperature sintering of sub-stoichiometric Ni-Cu-Zn ferrites: Shrinkage, microstructure and permeability

► Sub-stoichiometric Ni-Cu-Zn ferrites with iron deficiency. ► Maximum shrinkage rate and good densification at 900 °C through sub-stoichiometry. ► Decomposition into stoichiometric ferrite and CuO. ► Increased permeability of μ=660. ► Well suited for fabrication of multilayer inductive devices.