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| Home > Publications database > Optical and EPR study of $Mn^{4+}$ ions in different crystal environments in Mn, Li co-doped MgO |
| Journal Article | PUBDB-2024-07206 |
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2024
Elsevier
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.omx.2024.100378 doi:10.3204/PUBDB-2024-07206
Abstract: The influence of Li ion on the symmetry of Mn4+ center and its photoluminescence (PL) in MgO:0,01%Mn, 3 % Liceramics is studied by the X-ray diffraction, electron paramagnetic resonance (EPR), PL and optical absorptionmethods. It is shown that Li co-doping stimulates conversion of Mn2+ on Mg site into Mn4+ and can decreasesymmetry of Mn4+ in a case of their specific close arrangement in the crystal lattice. Two kinds of Mn4+ centersare identified in the EPR and PL spectra: cubic Mn4+ and tetragonal complex Mn4+-Li+. The parameters ofcorresponding EPR centers are estimated from the experimental spectra (gcub = 1.994, |A|cub = 70.9 × 104 cm 1;g1tetr = g2tetr = 1.994, g3tetr = 1.993, |A|tetr = 71 × 104 cm 1, |D|tetr = 220 × 104 cm 1). The PL lines observed inthe low temperature PL spectra are assigned to the specific Mn4+ related centers using a complementary study ofPL excitation spectra and temperature dependent PL spectra. The lines at 654 nm and 671 nm are ascribed to R-line of Mn4+ in a site of cubic symmetry and its phonon overtone, correspondingly, as well as the lines at 666 nmand 681 nm are attributed to R2 line of Mn4+ in site with tetragonal symmetry and to its phonon overtone,correspondingly. It is shown that in Mn doped MgO ceramics made without intentional Li co-doping, the cubicMn4+ center can be present and contribute to the PL spectra
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