Bonding and ion–ion interactions of Mn2+ ions in fluoride-phosphate and boro-silicate glasses probed by EPR and fluorescence spectroscopy

摘要: Abstract Electron paramagnetic resonance (EPR) and fluorescence spectroscopy are sensitive selective methods for probing coordination bonding of Mn2+ ions in glasses. Both provide additional information on Mn–Mn ion interactions cluster formation. was found to be tetrahedrally coordinated boro-silicate glasses high optical basicity, octahedrally low alkaline (duran-type) as fluoride-phosphate Broad emission bands multicomponent decay curves duran indicate very strong the presence multiple sites. Site distribution is more homogenous metaphosphate glasses, though concentration quenching apparent at Mn-levels. As Mn-content increases EPR spectra show exchange narrowing due a decrease distances series, but extreme linewidth broadening increased sizes constant For systems investigated, lifetimes wavelength maximum with increasing g-values sextet g = 2. octahedral hyperfine splitting decreases linearly result an covalent character Mn2+–ligand bond.