EPR and Optical Absorption Study of Fe3+-Doped Mono Hydrated Dipotassium Stannic Chloride

Abstract

Electron paramagnetic resonance (EPR) study of Fe3+ ion-doped dipotassium stannic chloride (K2SnCl4·H2O, DPSC) single crystal is performed at X band frequency and liquid nitrogen temperature. The Zeeman g-factor, axial zero-field splitting parameters and rhombic zero-field splitting parameters of Fe3+ ion in DPSC are determined with the help angular dependence of EPR spectra. Fe3+ ion enters the crystal lattice substitutionally replacing the K+ ion. The optical absorption spectra are recorded at room temperature in the wavelength range 195–1,100 nm. The transitions are assigned from the ground state \({}^{6}{\text{A}}_{{1{\text{g}}}} \left( {\text{S}} \right)\) to different excited states of Fe3+ ion. The observed band positions fitted by four parameters, Racah inter-electronic repulsion parameters (B and C), cubic splitting parameters (Dq) and Trees correction (α) yield: B = 831 cm−1, C = 2,198 cm−1, Dq = 820 cm−1, and α = 90 cm−1.