Author: Natarajan B. Mithira S. Deepa S. Ravikumar R. Sambasiva Rao P.
Publisher: Taylor & Francis Ltd
ISSN: 1042-0150
Source: Radiation Effects and Defects in Solids, Vol.161, Iss.3, 2006-03, pp. : 177-187
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Abstract
Single crystal electron paramagnetic resonance (EPR) spectroscopic investigation of VO(II) doped dipotassium diaquabis(malonato-κ 2 O,O′) zincate dihydrate has been carried out at X-band frequencies at 300 K. Single crystal, rotated along the three orthogonal crystallographic axes, has yielded spin Hamiltonian parameters g and A as g xx =1.978, g yy =1.972, g zz =1.936 and A xx =7.12, A yy =6.73, A zz =18.24 mT, respectively. These spin Hamiltonian parameters reflect a slight deviation from axial symmetry to rhombic, which is explained by the interstitial occupation of vanadyl ions. The isofrequency plots and powder EPR spectrum have been simulated using the calculated spin Hamiltonian parameters. The percentage of metal–oxygen bond has been estimated to be 20%. The admixture coefficients and bonding parameters have also been calculated by combining the EPR data with optical data.
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