Use of aluminum oxide and phosphorus pentoxide compounds for solubilizing rare earth metal ions pres

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The invention relates to the use of the compounds Al O and P O to solubilize ions rare earths (TR) present as doping agents in glasses containing silica, in which : CP/C > 1, 3 approximately C, and C, indicating the elementary molar aluminium and phosphorus concentrations, respectively in the aforementioned glass containing silica.