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EPR and optical absorption studies of vanadyl impurity in lithium hydrogen oxalate single crystal
Authors:Ram Kripal  Manju Maurya
Affiliation:1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China;2. Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, Nanning 530004, PR China;3. Guangxi Zhuang Autonomous Region Metallurgical Products Quality Supervision and Test Station, Nanning 530023, PR China;1. Department of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea;2. Department of Chemical Engineering, Kangwon National University, Samcheok 245-711, South Korea;1. Instituto Superior Minero Metalúrgico (ISMM), Moa 83300, Cuba;2. Institute of Materials Science and Technology-Havana University, La Habana 10400, Cuba;3. Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil;4. SPIE-ICTP Anchor Research in Optics Program Laboratory, International Centre for Theoretical Physics (ICTP), Strada Costiera 11, Trieste 34151, Italy;5. Centro Multidisciplinario de Ciencias, Instituto Venezolano de Investigaciones Científicas (IVIC), 5101 Mérida, Venezuela;6. National Center for Technological Research (CEADEN), La Habana 10400, Cuba;7. CICATA-IPN, Legaria 694, Col. Irrigacion, Del., Miguel Hidalgo CP 11500, Mexico
Abstract:Electron paramagnetic resonance (EPR) and optical absorption studies of vanadyl ions in lithium hydrogen oxalate monohydrate single crystal and powder are reported at room temperature. Single crystal rotations in each of the three mutually orthogonal crystalline planes, ab1, b1c1 and ac1 indicate four different vanadyl complexes. The detailed investigation of EPR spectra indicates that one of the VO2 + sites (the intense one) may enter the lattice substitutionally and the other three occupy the interstitial positions. From the angular variation, the spin Hamiltonian parameters are evaluated and discussed. The optical absorption spectrum shows four bands. From the optical and EPR data, various bonding parameters are determined and the nature of bonding in the crystal is discussed.
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