Journal
MATERIALS
Volume 15, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma15113797
Keywords
active glass-ceramic; luminescent properties; nucleation; precursor of crystallization; antimony-germanate glass; Eu3+ ions; asymmetry ratio
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Funding
- National Science Centre (Poland) [DEC-2019/35/O/ST5/03105]
- Bialystok University of Technology
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The paper aims to develop a glass-ceramic material with a balance of crystallization, thermal stability, and optical properties. The experiment demonstrates that the fabricated material exhibits glass-ceramic characteristics with high transparency and thermal stability.
Glass-ceramic is semi-novel material with many applications, but it is still problematic in obtaining fibers. This paper aims to develop a new glass-ceramic material that is a compromise between crystallization, thermal stability, and optical properties required for optical fiber technology. This compromise is made possible by an alternative method with a controlled crystallization process and a suitable choice of the chemical composition of the core material. In this way, the annealing process is eliminated, and the core material adopts a glass-ceramic character with high transparency directly in the drawing process. In the experiment, low phonon antimony-germanate-silicate glass (SGS) doped with Eu3+ ions and different concentrations of P2O5 were fabricated. The glass material crystallized during the cooling process under conditions similar to the drawing processes'. Thermal stability (DSC), X-ray photo analysis (XRD), and spectroscopic were measured. Eu3+ ions were used as spectral probes to determine the effect of P2O5 on the asymmetry ratio for the selected transitions (D-5(0) -> F-7(1) and D-5(0) -> F-7(2)). From the measurements, it was observed that the material produced exhibited amorphous or glass-ceramic properties, strongly dependent on the nucleator concentration. In addition, the conducted study confirmed that europium ions co-form the EuPO4 structure during the cooling process from 730 degrees C to room temperature. Moreover, the asymmetry ratio was changed from over 4 to under 1. The result obtained confirms that the developed material has properties typical of transparent glass-ceramic while maintaining high thermal stability, which will enable the fabrication of fibers with the glass-ceramic core.
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