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.
Karabulut
Bünyamin
B
Ondokuz Mayis University, Faculty of Art and Sciences, Department of Physics, 55139 Samsun, Turkey. bbulut@omu.edu.tr
Tufan
Ayşe
A
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