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• W3009668256 abstract "Abstract EPR spectra of Mn 2+ ions in two systems of heavy metal fluoride glasses are investigated. The compositions (in mol.%) of the base glasses are 60 XF 4 -5LaF 3 -20 BaF 2 -15 NaF (where X is Zr or Hf). The glasses were doped with MnF 2 at concentrations from 0.05 to 0.3 wt%. EPR observations were made at the X-band and Q-band frequencies. A hyperfine sextet with a splitting of about 100 Oe is observed. At the X-band the hyperfine spectrum is superimposed on a very broad background line. A weak reasonance absorption with g ≅ 4.3 and hyperfine splitting of about 100 Oe is found. The background line and g ≅ 4.3 spectrum disappear at the Q-band. The peak-to-peak linewidths of hyperfine components of the g ≅ 2.0 line depend strongly on Mn concentration. Forbidden Δm = ∓ 1 transition and superhyperfine structure arising from 19 F ligands were not detected. It is concluded that Mn 2+ sites are characterized by broad distribution of crystal-field parameters. This is attributed to the fact that Mn 2+ impurities can be incorporated in positions with a broad distribution of MnF distances which is expected for the glasses with a broad distribution of the distances between host atoms. A non-random distribution of Mn 2+ ions which tend to be clustered in some regions of the glass network is assumed." @default.
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• W3009668256 date "1985-01-01" @default.
• W3009668256 modified "2023-09-24" @default.
• W3009668256 title "EPR of Mn2+ ions in heavy metal fluoride glasses" @default.
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• W3009668256 doi "https://doi.org/10.1016/0022-3093(85)90032-8" @default.
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