Grain and grain boundaries influenced magnetic and dielectric properties of lanthanum-doped copper cadmium ferrites

• Published in: Journal of materials science. Materials in electronics 2022-04, Vol.33 (10), p.7636-7647
• Main Authors: Gore, Shyam K., Tumberphale, Umakant B., Jadhav, Santosh S., Shaikh, Shoyebmohamad F., Al-Enizi, Abdullah M., Rana, Abu ul Hassan S., Khule, Ravindra N., Raut, Siddheshwar D., Gore, Tanay S., Mane, Rajaram S.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Copper; Crystallites; Dielectric loss; Dielectric properties; Ferrites; Grain boundaries; Grain size; Lanthanum; Locomotion; Magnetic permeability; Magnetic properties; Magnetic transitions; Magnetization; Materials Science; Morphology; Nanomaterials; Optical and Electronic Materials; Parameters; Permeability; Permittivity; Physical properties; Sol-gel processes; Temperature dependence
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-07912-8

The physical properties of La 3+ -doped Cu–Cd ferrites (CCF ferrites) were investigated with an aim to analyze the effect of large-sized La 3+ cations on the structure, morphology, magnetization, permeability, and dielectric parameters. Temperature-dependent permeability and permittivity of CCF ferrites are in good agreement with locomotion of grains and grain boundaries. The CCF ferrites are synthesized by a sol–gel method. The Rietveld refinement promoted for the structural confirmation reveals the cubic spinel structure of CCF ferrites. The morphology of all ferrites investigated by surface scanning analysis images indicates the presence of cubical and triangular crystallites. The analysis of magnetic parameters of CCF ferrites measured through a high-field magnetization evidences magnetic transition from paramagnetic to ferrimagnetic phase. The magnetic permeability increases and magnetic loss decreases on enhancing La 3+ content from 0.0 to 0.20. When temperature is stepped up from 25 to 150 °C, the permeability is improved. The increase in permittivity and decrease in ac conductivity is assigned to increase of grain size and reduction of grain boundaries as explained by Maxwell–Wagner model. The magnetic and electrical performance of CCF ferrites demonstrate their potential use in microwave devices. The CCF ferrites possessing soft magnetic behavior along with low magnetic and dielectric losses are promising nanomaterials for high-frequency applications too.