Laser spectroscopy of spinel microcrystallites in a Cr3+ doped silicate glass |
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Authors: | F Durville B Champagnon E Duval G Boulon |
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Institution: | Laboratoire de Physico-Chimie des Matériaux Luminescents, U A. 442 CNRS, Université Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cédex, France |
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Abstract: | Laser spectroscopy of Cr3+ ions makes it possible to follow the crystallization process in a cordiente glass (52 SiO2, 347 Al2O3, 12.5 MgO and 08 Cr2O3) Absorption and fluorescence are interpreted by structural considerations showing the variation of Cr3+ environment during heat treatment Fluorescence line narrowing is performed at 4 2 K giving information on the detailed crystal structure in MgAl2O4 spinel microcrystallites formed during heat treatment The splitting of the 2E level is close to 70 cm?1 and the ¦2D¦ parameter ranges between 0 95 and 1 35 cm?1 This wide distribution is associated with the well known disordered distribution of Mg2+ and Al3+ cations in MgAl2O4 spinels. |
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