Abstract
NZFO/BTO ceramic composites with different ferrite contents were successfully prepared by a sol–gel in situ method. X-Ray diffractometry (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and impedance analysis were used to reveal the microstructure and magnetic properties of the as-prepared composites. The influence of the non-magnetic phase on the magnetic properties of the composite was analyzed based on the composition dependence of the microstructure, effective permeability, saturation magnetization and coercivity. It reveals that a transition of topological structure appears when the volume fraction of the NZFO phase approaches the percolation threshold fc = 0.55. In the composites below fc, the magnetic particles are surrounded by a non-magnetic phase, and the magnetic properties are controlled by both the demagnetizing field and domain wall motion in the ferrite phase. However, in the composites above fc, the magnetic particles are completely coalescent with each other, thus the magnetic behaviors are closely dependent on the anisotropic field of the ferrite phase. The magnetic properties of the NZFO/BTO ceramic composite synchronously exhibit a critical behavior at the percolation threshold.
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