EPR study of vanadyl ions in Li{sub 2}O-MoO{sub 3}-B{sub 2}O{sub 3} glasses[Electron Spin Resonance]

Journal Article · Sat May 01 00:00:00 EDT 1999 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(99)00111-7· OSTI ID:20005949

Krishna, R M; Andre, J J; Seth, V P; Khasa, S; Gupta, S K

Electronic paramagnetic resonance (EPR) spectra of xLi{sub 2}O{center{underscore}dot}(30 {minus} x)MoO{sub 3}{center{underscore}dot}70B{sub 2}O{sub 3} glasses (0 {le} x {le} 25) containing 2 mol% V{sub 2}O{sub 5} were studied between room and liquid-helium temperatures at X-band frequencies. The spectra are typical of V{sup 4+} ions present in vanadyl (VO{sup 2+}) form in the glass. The spin-Hamiltonian parameters (SHP), g{sub {parallel}} g{sub {perpendicular}}, A{sub {parallel}}, and A{sub {perpendicular}}, 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{sup 4+}O{sub 6} complex increases with increase in the Li{sub 2}O:MoO{sub 3} ratio. It was also found that the increase in this ratio results in an expansion of the 3d{sub 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.

• Research Organization: CNRS, Inst. Charles Sadron, Strasbourg (FR)
• OSTI ID: 20005949
• Journal Information: Materials Research Bulletin, Vol. 34, Issue 7; Other Information: PBD: May 1999; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRONIC STRUCTURE
LITHIUM OXIDES
MOLYBDENUM OXIDES
BORON OXIDES
VANADIUM OXIDES
GLASS
ELECTRON SPIN RESONANCE
CHEMICAL COMPOSITION