EPR study of vanadyl ions in Li2O–MoO3–B2O3 glasses
| Autor: | Satish Khasa, J.J. André, V. P. Seth, S.K. Gupta, R.M. Krishna |
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| Rok vydání: | 1999 |
| Předmět: |
Chemistry
Mechanical Engineering Inorganic chemistry Analytical chemistry Resonance Vanadium chemistry.chemical_element Electronic structure Condensed Matter Physics law.invention Ion Paramagnetism Tetragonal crystal system Unpaired electron Mechanics of Materials law General Materials Science Electron paramagnetic resonance |
| Zdroj: | Materials Research Bulletin. 34:1089-1097 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/s0025-5408(99)00111-7 |
| Popis: | Electronic paramagnetic resonance (EPR) spectra of xLi 2 O·(30 − x)MoO 3 ·70B 2 O 3 glasses (0 ≤ x ≤ 25) containing 2 mol% V 2 O 5 were studied between room and liquid-helium temperatures at X-band frequencies. The spectra are typical of V 4+ ions present in vanadyl (VO 2+ ) form in the glass. The spin-Hamiltonian parameters (SHP), g ∥ g ⊥ , A ∥ , and A ⊥ , the dipolar hyperfine coupling parameter, P, and the Fermi constant interaction parameter, k, were evaluated. It was found that these parameters are independent of the temperature. Results suggest that the tetragonal distortion of the V 4+ O 6 complex increases with increase in the Li 2 O:MoO 3 ratio. It was also found that the increase in this ratio results in an expansion of the 3d xy orbit of unpaired electrons in the vanadium ion and that the spin-Hamiltonian parameters do not depend on the value of theoretical optical basicity. |
| Databáze: | OpenAIRE |
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