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Temperature dependencies of the relative dielectric permittivity (ε′) and loss tangent (tan δ) of SFO (a) and SFN3O (d). (b, c) Arrhenius law fittings of the dielectric peaks of SFO in regions I and II, respectively. (e) Enlarged view of the loss tangent of SFN3O with a strong frequency dependence at temperatures between 25 and 160 °C. (f) Arrhenius law fitting of the dielectric peak in region II for the SFN3O hexaferrite.
