R. Kripal, Pragya Singh, Santwana Shukla
Feb 1, 2011
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Journal
Physica B-condensed Matter
Abstract
Abstract EPR spectra of Cr 3+ ions doped in potassium sodium dl -tartrate tetrahydrate single crystals are recorded at 77 K. The spin Hamiltonian and zero field parameters g , | D | and | E | are measured from the resonance lines obtained at various rotations of the magnetic field. The values obtained are: g x =1.9257±0.0002, g y =1.9720±0.0002, g z =2.0102±0.0002, | D |=313±2 (×10 −4 ) cm −1 and | E |=101±2 (×10 −4 ) cm −1 . From the results of EPR study, the site symmetry of Cr 3+ ion in the crystal is discussed. The optical absorption at room temperature is also studied. From the observed band positions, the crystal field splitting parameter ( D q ) and the Racah inter-electronic repulsion parameters ( B and C ) are evaluated. The bonding parameters are obtained by correlating optical and EPR data and the nature of bonding in the crystal is discussed.