EPR and optical study of Mn2+ doped monohydrated dipotassium stannic chloride

Abstract

Electron paramagnetic resonance (EPR) study at room temperature (RT) is used to investigate the property of Mn2+ doped monohydrated dipotassium stannic chloride (K2SnCl4⋅H2O) single crystal. EPR spectra show that there exist two substitutional sites, the spin Hamiltonian parameters for which are determined. The optical absorption study is also done at room temperature in the wavelength range 195–1100nm. The observed bands are assigned as transitions from 6A1g(S) ground state to various excited states. These bands are fitted with four parameters, namely Racah inter-electronic repulsion parameters B=792cm−1, C=2278cm−1; cubic crystal field splitting parameter Dq=700cm−1 and Trees correction α=76cm−1. The nature of metal–ligand bonding is discussed on the basis of EPR and optical data. Superposition model (SPM) is used to find out the crystal field (CF) parameters and the perturbation formulae are used to obtain zero-field splitting (ZFS) parameters. Theoretically calculated ZFS parameters match well with the experimental values obtained from EPR study.