An EPR and optical absorption study of VO2+ ions in sodium hydrogen oxalate monohydrate (NaHC2O4.H2O) single crystals.
Electron paramagnetic resonance of VO(2+) doped sodium hydrogen oxalate monohydrate (NaHC(2)O(4).H(2)O) single crystals and powders are examined at room temperature. Single crystal rotations in each of the three mutually orthogonal crystalline planes namely ac*, b*c* and ab* indicate four different VO(2+) complexes with intensity ratios of 4:2:1:1. It is found from the EPR analysis that the Na(+) ions are replaced with the substitutional magnetically inequivalent VO(2+) ions. The powder spectrum also clearly indicates four different VO(2+) complexes, confirming the single crystal analysis. Crystalline field around the VO(2+) ion is nearly axial. The optical absorption spectrum show two bands centered at 15408 and 12453 cm(-1). Spin Hamiltonian parameters and molecular orbital coefficients are calculated from the EPR and optical data, and results are discussed.
Ondokuz Mayis University, Faculty of Art and Sciences, Department of Physics, 55139 Samsun, Turkey. bbulut@omu.edu.tr
Bünyamin
B
Karabulut
Ayşe
A
Tufan
D000042:Absorption; D002413:Cations, Divalent / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D055095:Optics and Photonics; D010070:Oxalates / Q000737:chemistry*; D017968:Vanadium Compounds / Q000737:chemistry*
D002413:Cations, Divalent; D010070:Oxalates; D017968:Vanadium Compounds