The structural, magnetic and optical performances of Ni0.2Zn0.2Co0.6Fe2O4 ferrites synthesized by sol-gel route

Abstract

In this work, four complexing agents participated in the synthesis of Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrites by sol-gel route. The X-ray diffraction (XRD) pattern showed that samples had formed spinel phase. The Fourier transform infrared (FTIR) spectra of samples showed two absorption bands around 400 cm −1 and 600 cm −1 , which are the characteristics of spinel ferrites. SEM micrographs showed that the prepared particles had different shape. Vibrating sample magnetometer was used to characterize magnetic performances. The prepared samples showed typical hysteresis behaviors at room temperature. The Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrite sample prepared with egg white as a complexing agent had high coercivity (1365.52 Oe) and remanent magnetization (23.95 emu/g), which indicated that the sample had a potential applications for magnetic storage devices. The sample prepared with egg white had a coercivity six times higher than coercivities (168.44-200.47 Oe) of other samples. These findings revealed that egg white is a suitable complexing agent to prepare Ni 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 hard ferrite by sol-gel route. The optical properties are characterized using PL emission spectra and UV-visible absorption spectrum. From the optical band gap (Eg) value, the sample has the characteristics of a semiconductor material. KeywordsNi 0.2 Zn 0.2 Co 0.6 Fe 2 O 4 ferrite • Sol-gel route • Four complexing agents • Magnetic performances • Optical performances

Structural, Frequency and Temperature Dependent Dielectric Properties of Zn2+ Substituted Ni-Co Based Spinel Ferrite (ZnxNi0.8−xCo0.2Fe2O4)

“…It can be observed two main absorption bands (υ 1 and υ 2 ) in FT-IR spectra of the nickel-cobalt-zinc ferrite which are associated to intrinsic stretching-vibrations of the oxygen bonds with metal cations in tetrahedral A-and octahedral B-sites. Similar observation is reported by Zhang et al 6 One can note that the frequency υ 1 shift to a lower value (594-580 cm −1 ) by increasing the Zn concentration, whereas υ 2 systematically moves toward higher wave number (400-412 cm −1 ). It is well known that the vibrational frequencies are inversely proportional to atomic mass and bond length.…”

“…The substitution with a controlled concentration of different divalent ions (Ni 2+ , Co 2+ and Zn 2+ ) in the spinel structure modifies their electromagnetic properties. 5,6 Hosting Co in Ni-Zn ferrites can improve the resistive properties with a reduction in dielectric loss. 5 It was also informed that partial substitution of Fe 3+ in B-sites spinel structure, by rare Earth (RE 3+ ) ions with large ionic radius may drive the structural properties to change by generating internal stress.…”