Structural, optical, electrical and magnetic properties of aluminum substituted Co–Cu–Zn nano-crystalline ferrites.

Strong electrical resistivity, low eddy current and dielectric losses, high saturation magnetization, high permeability, and other significant electrical and magnetic properties of nano-ferrites are only a few. In this investigation a sincere effort has been tried to manufacture Co 0.7 Cu 0.2 Zn 0.1 Fe 2- x Al x O 4 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) nano-ferrites utilizing sol-gel auto-combustion process and systematically characterize the structural, optical, electrical and magnetic features. All the peaks belonging to XRD confirmed a structure of the spinel class and single phase with zero impurities. The intensity ratios are generated for a number of cation combinations occupying tetrahedral and octahedral B site. The higher band (ν 1) is identified in between wave numbers 550-600 cm−1 as a result of the vibrations of stretching pertaining to the metal-oxygen tetrahedral band. The grain sizes are measured by the use of image J software associated with the SEM, which are indicated on the images in the range of 3.14 μm–1.215 μm. With a frequency-independent characteristic, the dielectric loss dwindles quickly at low frequencies and slows down at high frequencies. Because of spin non-collinearity at the crystal's surface, the saturation magnetization values climb as particle sizes increase. The coercivity values gradually decline as aluminum concentration rises. [Display omitted] • Nano-crystalline ferrites are successfully synthesized by a facile sol-gel auto-combustion method. • Single phase cubic spinel structure has been obtained and the lattice constant decreases with increasing concentration. • The saturation magnetization was obtained for 61.431 emu/g at x = 0 compound. • The dielectric constant decreases steeply at lower frequencies and remains constant at higher frequencies. [ABSTRACT FROM AUTHOR]