| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electron Paramagnetic Resonance and Optical Absorption of VO2+ Doped Bis (glycinato) Mg (II) Monohydrate Single Crystals |
| Prashant Dwivedi1, Ram Kripal2, Santwana Shukla2 |
| 1Department of Physics, Kali Charan Nigam Institute of Technology, Banda (U.P.) 210001, India2EPR Laboratory, Department of Physics, University of Allahabad, Allahabad, 211002, India |
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| Cite this article: |
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Prashant Dwivedi, Ram Kripal, Santwana Shukla 2010 Chin. Phys. Lett. 27 017601 |
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Abstract We investigate the electron paramagnetic resonance (EPR) of VO2+ ions in bis (glycinato) Mg (II) monohydrate single crystals at room temperature. Detailed EPR analysis indicates the presence of only one VO2+ site. The vanadyl complexes are found to take up the substitutional position. The angular variation of the EPR spectra in three planes a*b, bc and ca* are used to determine principal g and A tensors. The values of spin Hamiltonian parameters are gx= 2.1447× 10-4, gy= 1.9974×10-4, gz= 1.9131×10-4, Ax= 49×10-4, Ay= 60×10-4, Az= 82×10-4 cm-1. The optical absorption study is also carried out at room temperature and absorption bands are assigned to various transitions. The theoretical band positions are obtained using energy expressions and a good agreement is found with the experimental data. By correlating EPR and optical data, different molecular orbital coefficients are evaluated and the nature of bonding in the crystal is discussed.
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| Keywords:
76.30.-v
78.20.Ci
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Received: 08 July 2009
Published: 30 December 2009
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| PACS: |
76.30.-v
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(Electron paramagnetic resonance and relaxation)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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