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- W2019915107 abstract "The growth of blue and green zircon (ZrSiO4) crystals from fluxes consisting of (PbO + V2O5) and (3 Bi2O3 + V2O5), respectively, is reported. Vanadium is found in the crystals and EPR experiments show that it occurs, at least in part, as V4+ in sites of tetragonal symmetry. EPR is observed at X-and Q-band frequencies at temperatures of 20 and 4.2 K. The hyperfine constants are anisotropic and A‖ shows a marked temperature dependence. The spin Hamiltonian parameters at 20 K are g⊥ = 1.8930 ± 0.0008, A‖ = (81.6 ± 0.2) × X 10−4 cm−1, g⊥ = 1.9699 ± 0.0008, A‖ = (28.9 ± 0.2) × 10−4 cm−1. At 4.2 K: A‖ = (84.1 ± 0.2) × 10−4 cm−1. Nous rapportons la croissance de eristaux des zircons (ZrSiO4) bleus et verts à partir des flux contenants (PbO + V2O5) et (3 Bi2O3 + V2O5) respectivement. La vanadium a été découvert dans les cristaux et les expériences RPE demontrent qu'il en existe au moins une partie sous la forme V4+ dans les sites de symmétrie tetragonale. Nous avons trouvé une RPE aux bandes de férquence × et Q aux températures 20 et 4.2 K. Les constantes hyperfines sort anisotropiques et le paramètre A‖ montre une dépendence marquée de la température. A 20 K les paramètres du spin-Hamiltonien sont g‖ = 1,8930 ± 0,0008: A‖ = (81,6 ± 0,2) × 10−4 cm−1; g⊥ = 1,9699 ± 0,0008; A‖ (28.9 ± 0.2) × 10−4 cm−1. A 4,2 K: A‖ = (84.1 ± 0.2) × 10−4 cm−1." @default.
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- W2019915107 date "1976-07-16" @default.
- W2019915107 modified "2023-10-16" @default.
- W2019915107 title "Coloured Synthetic zircon crystals. Flux growth and EPR of V4+ impurity centres" @default.
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- W2019915107 doi "https://doi.org/10.1002/pssa.2210360133" @default.
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