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• The samples Ca 0.5 Ba 0.5-x Cu x Fe 2 O 4 (x = 0.00, 0.125, 0.250, 0.350, 0.500) spinel ferrites prepared by sol–gel auto combustion method results in enhanced structural, dielectric and magnetic properties. • XRD patterns of samples indicate that the peaks match well with the standard patterns of the spinel ferrites. • Crystallite size lies in the range of 37.43–50.07 nm. • At room temperature the conductivity of ferrites is due to impurity, as at higher temperature conductivity is occurring through polaron hopping. • Dielectric constant according to Maxwell–Wagner model the dielectric substance contains with heterogeneous structure thought that good conducting grains separated by highly resistant thin grain boundaries. • Dielectric losses very essential part of the sum core loss in magnetic materials, According to Hudson theory. Copper-substituted spinel ferrites with nominal composition Ca 0.5 Ba 0.5-x Cu x Fe 2 O 4 (x = 0.00, 0.125, 0.250, 0.350, 0.500) were successfully prepared by the sol–gel auto combustion route. The fabricated Nano-ferrites underwent a five-hour annealing process at 800 °C in a furnace. By the X-ray diffraction (XRD) analysis and dielectric measurements, the structural and electrical behavior of Ca 0.5 Ba 0.5-x Cu x Fe 2 O 4 nanoparticles were examined. Formations of a single-phase cubic structure of all prepared samples were estimated by the X-ray diffraction analysis. Crystallite size ranges from 37.43 to 50.07 nm. With the addition of Cu2+ cation, the lattice parameter, dielectric characteristics, and magnetic parameters were enhanced. It was observed that dielectric properties were improved significantly with the doping of copper. The dielectric constant and dielectric loss were found to decrease at high frequencies. On the other hand, an increase in AC conductivity was observed with increasing frequency by Maxwell Wagner and Koop's models. The VSM study confirms the improved magnetic properties of the sample. Remanent magnetization, saturation magnetization, and coercivity were improved significantly with the doping of copper cation. Based on these improved dielectric and magnetic characteristics, the prepared materials are strongly recommended for different electronic components and energy storage devices. [ABSTRACT FROM AUTHOR]

[Display omitted] • M type hexaferrites with composition Pb 1-x Cr x Fe 12 O 19 x = (0.0,0.1,0.2,0.3,0.4,0.5) were synthesized by the sol-gel auto combustion technique. • Peaks of the XRD pattern match well with the standard pattern of P63/mmc group with JCPDS card No (43-0002). • Crystallite size lies in the range of 63–53 nm. Lattice parameters, crystallite size and cell volume was found to decrease with the substitution of Cr3+ content. • Dielectric constant and ac conductivity (σ ac) increases gradually with the increase in Chromium doping. Mofreover, Pb 1-x Cr x Fe 12 O 19 with x = 0.2 have exceptional dielectric properties with significant Q-value (4900). • These samples may suitable for high frequency applications such as phase shifter, modulators and also in longitudinal recording media. Chromium substituted M-type hexagonal ferrites with nominal composition Pb 1-x Cr x Fe 12 O 19 where x= (0.0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared via sol gel route. Structure of the single phase lead hexaferrite was estimated from X-ray diffraction (XRD) analysis. Scanning electron microscopy (SEM) confirmed the formation of hexagonal platelets with an average grain size in the range of 53–63 nm. Crystallite size, lattice parameters and cell volume was found to decrease with the increase of Chromium concentration. Magneto crystalline anisotropy and saturation magnetization has been explored through the law of approach to the saturation magnetization. Saturation magnetization first increased and then found to be maximum (64 emu/g) at 30% of Cr3+ doped lead hexaferrite and minimum coercivity (6.54 KOe) was perceived for this composition. Dielectric constant, dielectric loss, tangent loss, real and imaginary part of electric modulus, ac conductivity and Q-values of the prepared samples were also explained. With the increase of dopant (Cr3+) concentration, dielectric constant was increased gradually. These characteristics are suitable for various applications such as phase shifter, modulators, stealth technologies and also in Multilayer chip inductor. [ABSTRACT FROM AUTHOR]