Tweaking the red emission, magneto, and dielectrical properties of perovskite type-LaFeO₃ in the presence of Co substitution

Perovskite-structured LaCo_xFe_1−xO₃ (x = 0.05, 0.1, 0.15, 0.2, 0.25) ceramic powders were produced via traditional solid-state reaction method. X-ray diffraction pattern, infrared spectra, and Raman have proved the formation of lanthanum perovskite. The incorporation of Co atoms in host lattice and the distortion of atoms were analyzed using Rietveld refinement method. The microstructure, nominal chemical composition, and uniform distribution of the particles and elements within the LaCo_xFe_1−xO₃ powders were examined by SEM–EDS and elemental mapping. The energy gap (E_g) value sof ceramic powders was estimated using UV–Vis spectroscopy, where the E_g values are in the range of 3.75 eV and 3.92 eV. The interesting red emission at 592 nm was identified by PL spectra. The dielectric behavior such as dielectric constant (ε′) and loss (tan δ) decreases with respect to increase in frequency of 10 Hz–1 MHz; on controversy, it increases with increasing temperature (40–200 °C). Magnetic studies clearly show the ferromagnetic (FM) nature of all the samples at room temperature. At higher substituting of Co content (x = 0.25), which has Co–Co interactions can be coupled antiferromagnetically, prominent to the small reduction of M_r and M_s. Hence, the obtained results related to the physical properties of synthesized ceramic powders were investigated.