% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Borkovska:618868,
      author       = {Borkovska, Lyudmyla and Kozoriz, K. and Vorona, I. and
                      Gudymenko, O. and Ponomaryov, S. and Melnichuk, O. and
                      Trachevskii, V. and Chukova, O. and Khomenkova, L.},
      title        = {{O}ptical and {EPR} study of ${M}n^{4+}$ ions in different
                      crystal environments in {M}n, {L}i co-doped {M}g{O}},
      journal      = {Optical materials: X},
      volume       = {24},
      issn         = {2590-1478},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {PUBDB-2024-07206},
      pages        = {100378},
      year         = {2024},
      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},
      cin          = {FS-PETRA-S / DOOR ; HAS-User},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PETRA-S-20210408 /
                      I:(DE-H253)HAS-User-20120731},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      NEPHEWS - NEutrons and PHotons Elevating Worldwide Science
                      (NEPHEWS) (101131414) / FS-Proposal: I-20231041 EC
                      (I-20231041-EC)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(EU-Grant)101131414 / G:(DE-H253)I-20231041-EC},
      experiment   = {EXP:(DE-H253)P-P66-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.omx.2024.100378},
      url          = {https://bib-pubdb1.desy.de/record/618868},
}