Transparent glass-crystalline materials co-activated with Eu 3+ / Gd 3+ were obtained by heat treatment of the initial lead fluoroborate glasses. It was found that the ions of rare-earth elements in the obtained transparent samples are located in nanoparticles of cubic crystals of lead fluoride, distributed in the bulk of the glass. It was shown that Eu 3+ ions are in a highly symmetric local environment and that the introduction of the second activator leads to an increase in the fraction of the nanocrystalline phase
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