JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, cilt.28, ss.1055-1064, 2015 (SCI İndekslerine Giren Dergi)
High-purity Mn-doped Ni (x) Zn0.9-x Fe-2 O (4) particles were fabricated by conventional ceramic processing. The ac conductivity reveals a temperature-dependent behavior at low frequencies and temperature-independent behavior at high frequencies which could be an indication of ionic conductivity because of activated frequency ranges. The dc conductivities of Mn-substituted Ni-Zn spinel ferrites [Ni (x) Zn0.9-x Mn-0.1:Fe-2 O (4) (where 0.3 a parts per thousand currency signxa parts per thousand currency sign 0.7)] are found to obey the Arrhenius plot with activation energies between 016 and 0.18 eV. The electrical characterization confirms that ac conductivity is found to be almost independent of frequency at lower frequencies up to 10 kHz and however increases with temperature elevation. Additionally, the imaginary component of dielectric function obeys the power law of frequency while it possesses temperature dependency as well. This can be attributed to the molecular interatomic interactions among Mn-substituted Ni-Zn spinel ferrites. Functional analysis of the electrical conductivities and dielectric permittivity suggests that ionic motions are strongly coupled within the spinel ferrite nanocomposites because of the stimulated frequency ranges.