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( 1)Laboratoire des Solides Irradiés,Ecole Polytechnique, Palaiseau, France et IRAMIS, CEA,France

nadege.ollier@polytechnique.edu yves.fuchs@univ-mlv.fr. Cr 3+ luminescence properties of Brazilian beryl and chrysoberyl (alexandrite and emerald ) Ollier Nadège (1) , Fuchs Yves (2) , Rossano Stéphanie (2) , Bordage Amélie (2) , Leal Jose Maria (3) , Horn Adolph Heinrich (3). Beryl-Emerald

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( 1)Laboratoire des Solides Irradiés,Ecole Polytechnique, Palaiseau, France et IRAMIS, CEA,France

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  1. nadege.ollier@polytechnique.edu yves.fuchs@univ-mlv.fr Cr3+ luminescence properties of Brazilian beryl and chrysoberyl (alexandrite and emerald )Ollier Nadège(1), Fuchs Yves (2), Rossano Stéphanie(2), Bordage Amélie(2), Leal Jose Maria(3), Horn Adolph Heinrich(3) Beryl-Emerald Al2Be3[Si6O18]:Cr C RF Substitution of Ti+Cr+Fe+Mg for Al in octahedral sites Substitution of Cr for Al in octahedral sites NC Emission of Cr3+ (532nm exc. ,300 K) in emeralds showing a lower crystal field for Capoeirana (C). The difference in Fe and Mg dopants amount NC=Novo Cruzeiro, RF= Ribeirao de Fogo) does not seem to affect the position of the R-lines (see insert). Comparison between beryl and emeralds: For low Cr3+ concentration , the crystal-field is higher than in emeralds and a second doublet line appears at 692 nm close to the inversion site position of chromium in alexandrite. Chrysoberyl-Alexandrite Al2BeO4:Cr Cr3+ emission in alexandrite (Camauba) and chrysoberyl (Malacaxeita) Cr2O3 versus Feo in the different samples of the Chrysoberyl-Alexandrite solid solution Malacaxeita Camauba Lifetime of Cr3+ lying in the miroir sites (300 K) in alexandrite minerals versus FeO content. Note the clear anticorrelation R1 and R2 lines of Cr3+ of respectively mirror-site symmetry (m) and inversion-site symmetry (i) are visible in alexandrite and chrysoberyl. However, the presence of impurities (Mg, Ti and Fe) and the Cr3+ content seem to influence the occupation rate of inversion site (emission not visible in Itabiritaï alexandrite and in chrysoberyl of Kilombo). Lifetime (microseconds) FeO weight % Perspectives Low temperature photoluminescence measurements, micro Pl EPR of Cr3+ to better understand the site occupation of the Cr3+ ions in the different minerals as a function of their impurities content (1)Laboratoire des Solides Irradiés,Ecole Polytechnique, Palaiseau, France et IRAMIS, CEA,France (2) Laboratoire Géomatériaux et Environnement (LGE), Université Paris Est-Marne la Vallée, France (3) Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil.

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