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Thermal Evolutions To Glass-Ceramics Bearing Calcium Tungstate Crystals In Borate Glasses Doped With Photoluminescent Eu3+ Ions

Takahito Otsuka, Martin Brehl, Maria Rita Cicconi, Dominique de Ligny, Tomokatsu Hayakawa

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Thermal evolutions of calcium-tungstate-borate glasses were investigated for the development of luminescent glass-ceramics by using Eu3+ dopant in a borate glass matrix with calcium tungstate, which was expected to have a combined character of glass and ceramics. This study revealed that single-phase precipitation of CaWO4 crystals in borate glass matrix was possible by heat-treatment at a temperature higher than glass transition temperature Tg for (100−x) (33CaO-67B2O3)−xCa3WO6 (x = 8−15 mol%). Additionally, the crystallization of CaWO4 was found by Raman spectroscopy due to the formation of W=O double bondings of WO4 tetrahedra in the pristine glass despite starting with the higher calcium content of Ca3WO6. Eu3+ ions were excluded from the CaWO4 crystals and positioned in the borate glass phase as a stable site for them, which provided local environments in higher symmetry around Eu3+ ions.