Exploration through Structural, Electrical, and Magnetic Properties of Al 3+ Doped Ni-Zn-Co Nanospinel Ferrites.

The exploration of aluminum (Al 3+ ) ion substituted nickel-zinc-cobalt (Ni-Zn-Co) nanoferrites is still at the infancy stage, although the structural, electrical, and magnetic properties have been widely investigated. Single-phase cubic nanospinel ferrites of Ni 0.4 Zn 0.35 Co 0.25 Fe 2- x Al x O 4 (0 ≤ x ≤ 0.12) with space group Fd 3 m were confirmed by the Rietveld refinement X-ray diffraction (XRD) data. Lattice constants displayed a declining trend with compositions x . The average particle size was found to range from 29 to 25 nm. Selected area electron diffraction (SAED) patterns were indexed according to space group Fd 3 m , indicating that nanoparticles are well crystallized. Samples' modes of vibrations swung between redshift and blueshifts as detected in the Raman spectra. The saturation magnetizations ( M s ) were in the range of 59.85-86.39 emu/g. Frequency-dependent dielectric constants (ε') and ac resistivity (ρ) measurement suggested that samples were highly resistive. These resistive nanoferrites with high saturation magnetizations may function effectively for multifaceted electronic devices.