Structural, Dielectric and Raman Spectroscopy of La³⁺–Ni²⁺–Zn²⁺ Substituted M‐Type Strontium Hexaferrites

Abstract

In this work, M‐type strontium nanohexaferrites with chemical composition Ba0.8−xSr0.2LaxFe12−x−yNixZnyO19 (x = 0.00, 0.05, 0.10; y = 0.00, 0.08, 0.16) are prepared using sol–gel auto‐combustion technique. The formation of single phase hexagonal ferrites is confirmed from XRD analysis. It also reveals the presence of magnetite and the crystallites sizes are in the range of 21.31–29.91nm. The lattice constants are found to decrease with an increase in cation substitution. The FTIR spectra of the sample show three dominant peaks in the range of 400–600 cm–1 which indicate the formation of the desired hexaferrite structure. The field emission scanning electron microscope images reveal large crystallites with shapes close to the hexagonal platelet‐like whose sizes are nonuniformly distributed. Also, agglomeration is observed due to magnetic interactions between the crystallites. The dielectric constant, dielectric loss, conductivity, and dielectric modulus are analyzed using the Maxwell–Wagner model. Dielectric constant is enhanced at high frequency in the entire sample and reduction of dielectric loss is also observed with further cations substitutions.

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

“…On the other side, the substitution of 'Cu' in the SLCHF sample results in a minor intensity of the resonance band compared to the parent compound. The difference in the ionic radii between Fe 3+ and Cu 2+ ions in B coordination causes a local distortion and vibrational bands of distorted polyhedral [39]. The broadening of the 4f 2 and 12k peaks compared to the SLHF sample indicates the presence of a disorder in the crystal sites as mentioned previously.…”

Effect of Nonmagnetic Doping on Dielectric Properties and Initial Permeability of Ba-Ni Ferrite Nanoparticles by Virtue of Zn2+ Ions

“…In addition, it can be shown that at x � 0.4, greater values of the real part and imaginary part ε″ were achieved in comparison to other samples. Koop's theory has been used to explain this kind of high dielectric constant event [28].…”