La³⁺ doping impact on CdCe_0.5Fe_1.5-yLa_yO₄ spinel ferrites properties and the correlation of crystallite size with magneto-dielectric parameters

This study explores the impact of La³⁺ doping on the structural, morphological, and magneto-dielectric properties of CdCe_0.5Fe_1.5-yLa_yO₄ (where y = 0.0, 0.01, 0.02, 0.03, and 0.04) spinel ferrites (SFs), with a particular focus on the correlation between crystallite size and magneto-dielectric parameters. The as-prepared SFs were synthesized via a sol–gel auto-ignition route. Different La³⁺ doping levels were introduced in the CdCe_0.5Fe_1.5-yLa_yO₄ spinel matrix and were analyzed the resulting structural, magnetic, and dielectric properties. X-ray diffraction studies revealed the change in crystallite size with increasing La³⁺ content. The surface morphology was observed using scanning electron microscopy analysis. Hysteresis loops were used to study the magnetic behavior and showed that increased La³⁺ doping significantly altered the magnetic properties. Dielectric studies indicated an improvement in dielectric constant and tangent loss, which are attributed to the enhanced polarization mechanisms due to La³⁺ doping. The correlation between crystallite size and magneto-dielectric properties was explored, revealing significant dependencies that provide insights into optimizing as-prepared SFs for advanced technological applications. The study demonstrates the effectiveness of La³⁺ doping in tailoring the magneto-dielectric response, and La³⁺ doped Cd-Ce SFs enhanced performance indicates that it is a good candidate for electronic and magnetic device applications.