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EPR and Optical Spectroscopy of Impurities in Two Synthetic Beryls

Abstract : Two synthetic beryls (Al2Be3Si6O18) of different color (purple and blue-green) were studied with electron paramagnetic resonance (EPR) and optical spectroscopy. In both crystals, the known spectra of Cu2+ and Fe3+ were observed with the same relative intensity. In the purple sample heated at 700°C in hydrogen atmosphere, two different kinds of Mn2+ EPR spectra were observed. The main one is pseudoaxial, it arises from ions substituted for Al3+ at position 4c of the structure. The weaker one is more complex, it has orthorhombic symmetry and is characterized by an unusually large zero-field splitting (B20 = 741·10-4 cm-1) and an isotropic hyperfine constant A = 70 G. This spectrum arises from Mn2+ at position 6f in the structure, normally occupied by Be. From optics, the blue-green color arises from Cu2+, while the purple one is due to Mn3+.
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https://hal-insu.archives-ouvertes.fr/hal-00089733
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Submitted on : Tuesday, August 22, 2006 - 4:37:48 PM
Last modification on : Friday, April 5, 2019 - 8:08:25 PM

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Jean-Michel Gaite, V. Izotov, S. Nikitins, S.Y. Prosvirnin. EPR and Optical Spectroscopy of Impurities in Two Synthetic Beryls. Applied Magnetic Resonance, Springer Verlag, 2001, 20, pp.307-315. ⟨10.1007/BF03162283⟩. ⟨hal-00089733⟩

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