EPR and Optical Absorption Study of Cr3+-Doped Dipotassium Tetrachloropalladate |
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Authors: | Ram Kripal Shri Devi Pandey |
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Institution: | 1. EPR Laboratory, Department of Physics, University of Allahabad, Allahabad, 211002, India
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Abstract: | X-band electron paramagnetic resonance (EPR) study of Cr3+-doped dipotassium tetrachloropalladate single crystal is done at liquid nitrogen temperature. EPR spectrum shows two sites. The spin-Hamiltonian parameters have been evaluated by employing hyperfine resonance lines observed in EPR spectra for different orientations of crystal in externally applied magnetic field. The values of spin-Hamiltonian and zero-field splitting (ZFS) parameters of Cr3+ ion-doped DTP for site I are: g x = 2.096 ± 0.002, g y = 2.167 ± 0.002, g z = 2.220 ± 0.002, D = (89 ± 2) × 10?4 cm?1, E = (16 ± 2) × 10?4 cm?1. EPR study indicates that Cr3+ ion enters the host lattice substitutionally replacing K+ ion and local site symmetry reduces to orthorhombic. Optical absorption spectra are recorded at room temperature. From the optical absorption study, the Racah parameters (B = 521 cm?1, C = 2,861 cm?1), cubic crystal field splitting parameter (Dq = 1,851 cm?1) and nephelauxetic parameters (h = 2.06, k = 0.21) are determined. These parameters together with EPR data are used to discuss the nature of bonding in the crystal. |
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