Magnetic resonance study of the crystallization behavior of InF3-based glasses doped with Cu2+, Mn2+ and Gd3+

Microstructure, mechanical, EPR and optical properties of lithium disilicate glasses and glass–ceramics doped with Mn2+ ions

“…The 'A' value is one of the parameters to indicate the coordination number of Mn 2+ ions which depends on the host matrix. The hyperfine splitting constant 'A' value obtained in the present work (90 G) is similar to the values reported for octahedrally coordinated Mn 2+ ions [34] and this suggests that the Mn 2+ ions are in octahedral symmetry.…”

“…Upon ceramization, the local environment of the transition metal ion incorporated into the glass leads to ligand field changes which may be reflected in the optical absorption and EPR spectra. Manganese ions emission wavelengths range from green to red; the green emission is characteristic of Mn 2+ in tetrahedral coordination, and the orange to red colours come from octahedrally coordinated Mn 2+ , with intermediate colours from a combination of both species [34]. An emission at 710 nm in the longer wavelength region is observed which might be due to the charge-transfer de-excitation associated with the Mn ion.…”

EPR and photoluminescence properties of Mn2+-activated zinc gallate phosphor prepared by urea combustion route and post heat treatment

“…Generally, A values in octahedral coordinated compounds are $ 100 G [31] and tetrahedral coordinated compounds are $ 83 G [45]. In the present work, the authors observed A value of 85 G, which indicates that Mn 2 þ ions are in tetrahedral symmetry.…”

“…As the crystal field splitting is normally much smaller than the Zeeman field (D 5gbH), resonances are observed due to transitions within the Kramers doublets split by the Zeeman field. The resonances near g E2.27 and 4.05 can be attributed to the rhombic surroundings of the Mn 2 þ ions [29][30][31]. The resonance at g E1.985 is due to the Mn 2 þ ions in an environment close to tetrahedral symmetry and is known to arise from the transition between the energy levels of the lower doublet, while the resonances at g E2.27 and 4.05 arise from the transition between the energy levels of middle Kramers doublet.…”

EPR spectra of the Mn2+ion in the oxyfluoride glass ceramics containing BaF2nanocrystalline phase

“…The Mn 2+ ion are particularly useful for investigation of the disordered media like glasses and powders since it has practically isotropic hyperfine (HF) interaction constant [6,7,8]. Coordination of neighboring fluorine nuclei exhibits additional superhyperfine (SHF) interaction which renders the nearest environment of the paramagnetic probe in the EPR spectra as additional SHF structure [9].…”