Chin. Phys. Lett.  2010, Vol. 27 Issue (1): 017601    DOI: 10.1088/0256-307X/27/1/017601
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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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.
Keywords: 76.30.-v      78.20.Ci     
Received: 08 July 2009      Published: 30 December 2009
PACS:  76.30.-v (Electron paramagnetic resonance and relaxation)  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/27/1/017601       OR      https://cpl.iphy.ac.cn/Y2010/V27/I1/017601
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Prashant Dwivedi
Ram Kripal
Santwana Shukla

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