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Article

Thermal Evolutions to Glass-Ceramics Bearing Calcium Tungstate Crystals in Borate Glasses Doped with Photoluminescent Eu3+ Ions

1
Field of Advanced Ceramics, Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya, Aichi 466-8555, Japan
2
Institute of Glass and Ceramics, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstraße 5, DE-91058 Erlangen, Germany
3
Frontier Research Institute for Materials Science (FRIMS), Nagoya Institute of Technology, Gokiso, Showa, Nagoya, Aichi 466-8555, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Baino
Materials 2021, 14(4), 952; https://doi.org/10.3390/ma14040952
Received: 31 December 2020 / Revised: 2 February 2021 / Accepted: 10 February 2021 / Published: 18 February 2021
(This article belongs to the Special Issue Glass-Ceramics: Structural Investigations and Luminescence Properties)
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. View Full-Text
Keywords: glass-ceramics; calcium tungstates; borate glasses; Eu3+ luminescence; asymmetry ratio glass-ceramics; calcium tungstates; borate glasses; Eu3+ luminescence; asymmetry ratio
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MDPI and ACS Style

Otsuka, T.; Brehl, M.; Cicconi, M.R.; de Ligny, D.; Hayakawa, T. Thermal Evolutions to Glass-Ceramics Bearing Calcium Tungstate Crystals in Borate Glasses Doped with Photoluminescent Eu3+ Ions. Materials 2021, 14, 952. https://doi.org/10.3390/ma14040952

AMA Style

Otsuka T, Brehl M, Cicconi MR, de Ligny D, Hayakawa T. Thermal Evolutions to Glass-Ceramics Bearing Calcium Tungstate Crystals in Borate Glasses Doped with Photoluminescent Eu3+ Ions. Materials. 2021; 14(4):952. https://doi.org/10.3390/ma14040952

Chicago/Turabian Style

Otsuka, Takahito, Martin Brehl, Maria R. Cicconi, Dominique de Ligny, and Tomokatsu Hayakawa. 2021. "Thermal Evolutions to Glass-Ceramics Bearing Calcium Tungstate Crystals in Borate Glasses Doped with Photoluminescent Eu3+ Ions" Materials 14, no. 4: 952. https://doi.org/10.3390/ma14040952

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