Exploring the structural and optical properties of lithium-chromium phosphate Li₃Cr₂(PO₃)₄

The Lithium-chromium phosphate Li₃Cr₂(PO₃)₄ sample was synthesized via the solid-state reaction method. The morphological integrity and chemical homogeneity were verified by energy dispersive X-ray analysis (EDX) and scanning electron microscopy (SEM). Infrared and Raman patterns were also analyzed. Optical absorption spectrum analysis, conducted within the range of 10000 cm^-1 to 30000 cm^-1 at room temperature, yielded some optical parameters (Eg, E_u, $$ , k, n). The Neuhauser model is used to interpret the interference dip which was on the absorption spectrum of Li₃Cr₂(PO₃)₄. The Fourier transform of the autocorrelation function leads to the Zero Phonon Lines of the observed absorption energies. The electronic structure of Cr³⁺ (3d (Huang et al., 2009) 33) ions in Li3Cr2(PO3)4 was calculated using Racah method, which allowed for precise calculations of Racah and crystal-field parameters. The results showed good agreement between the theoretical and experimental energy levels.