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Open AccessArticle

Crystallization of GeO2–Al2O3–Bi2O3 Glass

Institute of Materials Engineering, Faculty of Science and Technology, University of Silesia, Katowice, 75 Pułku Piechoty Str. 1a, 41-500 Chorzów, Poland
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Crystals 2020, 10(6), 522; https://doi.org/10.3390/cryst10060522
Received: 22 April 2020 / Revised: 9 June 2020 / Accepted: 11 June 2020 / Published: 18 June 2020
(This article belongs to the Special Issue Transparent Glass Ceramics)
In the presented work, two kinds of germanium oxide glass with different compositions, namely GeO2 and GeO2–Al2O3–Bi2O3, were investigated. After controlled crystallization of a glassy sample, the emission in the NIR-range was determined (1165 nm with excitation at 470 nm). To better understanding the kinetics of the glass crystallization, the activation energy was also determined by applying the Kissinger method. The obtained results show that in the case of GeO2–Al2O3–Bi2O3, activation energy value was 400 and 477 kJ/mol, which means that such values are significantly larger than for pure GeO2 (254 kJ/mol). The investigations also show that two phases crystallized in the complex glass matrix: the mullite-like phase and germanium oxide. View Full-Text
Keywords: glass crystallization; kinetics; NIR-emission glass crystallization; kinetics; NIR-emission
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Płońska, M.; Plewa, J. Crystallization of GeO2–Al2O3–Bi2O3 Glass. Crystals 2020, 10, 522.

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