Abstract
A series of Ba2NiCoDy x Fe12-x O22 (x = 0.00, 0.05, 0.01, 0.15, 0.20, 0.25) nano-structured Y-type hexaferrites were synthesized by the sol-gel auto-combustion technique. XRD analysis revealed Y-type hexagonal phase is formed. The increase in Dy content leads to the slight increase in the lattice parameter c indicating the distortion in the cell due to difference in atomic radii. SEM micrograph confirms the increase in grain size with the substitution of Dy. The irregular platelet-like particles were also observed in SEM profiles. Electrical permittivity decreases with the increase of frequency due to interfacial polarization in accordance with Maxwell Wagner model. At high frequencies, grain boundaries were effective and at low frequencies, the permittivity decreases due to conducting grains. Magnetization and coercivity also decreases as the Dy doping increases. The decrease in magnetization may be attributed to segregation of Dy at grain boundaries. The decrease in coercivity is due to decrease in exchange coupling effect between neighboring domains.
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