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Some good percs: Ferroelectric/ferrimagnetic composite ceramics with percolation thresholds of 0.85–0.95 were obtained by an in situ sol–gel process that leads to enwrapping and separation of the conductive ferrite by a ferroelectric phase, e.g. BaTiO3. Such a super high threshold leads to a sharp increase in permittivity (ε) and initial permeability (μi) with increasing ferrite fraction (see graph; NZFO=Ni0.5Zn0.5Fe2O4).
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Zheng et al. (2009) studied this question.
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