CaO-Al2O3-SiO2 glasses doped with Bi3+ : preparation, structure and magnetic properties

The research focused on the development of a new type of aluminosilicate glass and glass-ceramics. The effect of the method of preparation of gelenite glasses (2CaO-Al2O3-SiO2) doped with Bi was investigated. The glasses in question were prepared by a combination of flame synthesis and solid-phase reaction and a rapid cooling method. The obtained knowledge can be used in the preparation of both gelenite glasses and glass-ceramics, since glass-ceramics are produced by controlled crystallization of the glasses. As a result of our research, the influence of the preparation method significantly affects the structure as well as the magnetic properties of Bi doped gelenite glasses. In terms of magnetic properties, glasses prepared by flame synthesis from precursor powders that were prepared by solid-phase reaction have complex magnetic properties where diamagnetic, paramagnetic and ferromagnetic/antiferromagnetic components of magnetization were present. The glasses prepared by the rapid cooling method exhibited diamagnetic and paramagnetic properties. The complexity of the magnetic properties was also associated with a more complicated structure of the glasses prepared by flame synthesis. From a practical point of view, this means that by choosing the method of preparation of Bi-doped gelenite glasses we can already set the necessary properties in advance.

Fig.: ZFC/FC curves of Bi-doped gelenite glasses fused by (a) flame synthesis (b) fast cooling method. In the case of glasses prepared by flame synthesis, there is a bifurcation of the ZFC/FC curves, which is often attributed to magnetically frustrated systems as a coexisting system of antiferromagnetic and ferromagnetic phases.

Related projects: open mobility (Open-Mob-2022-06) and VEGA 2/0141/21.
The result was achieved in collaboration with the Department of Chemistry of the University of Ghent, the Institute of Inorganic Chemistry of the Slovak Academy of Sciences, v.v.i. and the University of Trenčín, Alexander Dubček University in Trenčín.

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• MAJEROVÁ, Melinda – RAKHMATULLIN, A. – HRUŠKA, B. – PÁLKOVÁ, H. – BRUNEEL, E. – ŠKRÁTEK, Martin – PRNOVÁ, A. – KRAXNER, J. – MAŇKA, Ján – GALUSEK, D. CaO-Al₂O₃-SiO₂ glasses doped with Bi³⁺: Preparation, structure, and magnetic properties. In 15th International Conference on Solid State Chemistry: Book of Abstracts. – Ústí nad Labem, Czech Republic: Jan Evangelista Purkyně University in Ústí nad Labem, 2024, p. 71. ISBN 978-80-7414-866-8.