2026
ACL
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M.Majerová, A.Rakhmatullin, R.Klement, E.Bruneel, M.Škrátek, B.Hruška, F.Šimko, A.Prnová, K.De Buysser, D.Galusek, 'The influence of the preparation method on the thermal, optical, magnetic, and structural properties of Bi3+ doped calcium aluminosilicate glasses', Ceram. Int. (2026) doi:10.1016/j.ceramint.2026.03.117
Bi-doped (0.25, 0.50, and 1.50 mol.% of Bi2O3) 2CaO-Al2O3-SiO2 glasses were prepared in two different ways (flame synthesis with a combination of solid-state reaction and conventional melting) to compare the influence of the preparation method on their thermal, optical, magnetic, and structural properties. All prepared samples were X-ray amorphous. Differential thermal analysis revealed significant differences in thermal properties of the prepared glasses depending on the preparation method. In the case of glasses prepared by flame synthesis, the glass crystallizes in one or two-steps, depending on the Bi content. Glasses prepared by the conventional melting method crystallize in a single step, independent of the bismuth content. A higher tendency toward crystallization with increasing Bi3+ addition was observed for both types of glasses, indicating the role of Bi as a nucleating agent. The photoluminescence properties of the prepared systems were studied in the visible spectral range. All prepared systems exhibited broad emissions in the spectral range from 350 to 750 nm, centered at ∼485 nm and ∼425 nm for glasses prepared by conventional melting and flame synthesis, respectively. Glasses prepared by conventional melting exhibit less complex magnetic properties than those prepared by flame synthesis. In glasses prepared by melting, the diamagnetic (at 300 K) and the paramagnetic (at 2 K) component of magnetization prevails, even at low magnetic fields. The glass microspheres prepared by flame synthesis were diamagnetic or weakly ferromagnetic at 300 K and paramagnetic or weakly ferromagnetic/antiferromagnetic at 2 K. These findings indicate that Bi-doped calcium-aluminosilicate glasses offer promising applications not only in optical but also, e.g., in magneto-optical devices.
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