Impact of aluminum substitution on the structural and dielectric properties of Ni–Cu spinel ferrite nanoparticles synthesized via sol–gel route

Aluminum substituted nickel copper Ni0.5Cu0.5AlxFe2 − xO4 (x = 0.0, 0.2, 0.4 and 0.6) spinel ferrite nanoparticles were prepared via sol–gel auto combustion method. All the samples were annealed at 600 °C for three hours in muffle furnace. The prepared samples were characterized using X-ray diffraction, scanning electron microscopy, Fourier transform infra-red spectroscopy and Impedance Spectroscopy to investigate their structure, morphology and...