Dielectric measurements displayed a decreasing trend in the frequency-dependent dielectric behavior, in accordance with Maxwell–Wagner interfacial polarization.
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Enhancement in the dielectric and magnetic properties of Ni<sup>2+</sup>-Cu<sup>2+</sup> co-doped BaFe<sub>11</sub>Cu<sub>1-<i>x</i></sub>Ni<sub><i>x</i></sub>O<sub>19</sub> hexaferrites (0.0 ≤ <i>x</i> ≤ 1.0).
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