Abstract
The ceramic composites containing 1-25 vol% BaTiO 3 in a ferrite matrix phase of Ni 0.3 Zn 0.7 Fe 2 O 4 were fabricated by sintering at 1250°C in air. The sintered composites indicated a steep increase in dielectric permittivity in a small BaTi0 3 ratio up to 5 vol%. In a limited BaTiO 3 ratio of 3-15 vol%, a reaction between Ni 0.3 Zn 0.7 Fe 2 O 4 and BaTi0 3 resulted in the production of a liquid phase during sintering, which caused correspondingly the formation of secondary phases of BaFe 2 O 4 ss and hexagonal BaTi0 3 ss. These solid phase and microstructure changes, however, brought about little contribution to the increasing permittivity of the composites. Electrical property evaluations combined with compositional analysis revealed that the remarkably increasing permittivity could be predominantly attributed to the electron hopping between Fe 2+ and Fe 3+ in the ferrite matrix, which was caused by the incorporation of a small amount of Ti 4+ into the spinel sublattice.
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