Univerzita Pardubice Fakulta chemicko- technologická

Univerzita Pardubice

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Publikace detail

Phosphate and borophosphate glasses modified with transition metal oxides

Autoři: Hostinský Tomáš | Mošner Petr | Koudelka Ladislav

Rok: 2023

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Phosphate and borophosphate glasses modified with transition metal oxides	In the group of Prof. Koudelka and Mošner, phosphate and borophosphate glasses have been studied at the Department of General and Inorganic Chemistry since 1997. During this time, countless glass systems have been prepared and studied in terms of their basic physicochemical properties, thermal and electrical properties as well as their structure using IR, Raman and NMR spectroscopy methods. Phosphorus oxide, P2O5, is a well-known glass-forming oxide and allows the preparation of glassy materials known as phosphate glasses. Phosphate glasses have properties different from conventional silicate glasses, including a higher coefficient of thermal expansion, lower values of thermal properties, the ability to dissociate other oxides better, and poorer chemical and thermal stability, which are based on differences between P2O5 and SiO2. In order to improve their chemical and thermal stability, but also to enhance other properties (optical, electrical, biocompatibility, solubility, etc.), these glasses are modified with additional oxides. These include mainly transition metal oxides but also oxides of alkali metals and alkaline earths and rare earth oxides. Another method of modification is by adding another glass-forming oxide, such as boron trioxide, B2O3, to form borophosphate glasses. In most cases, adding other oxides does not change the properties of the glass linearly. This phenomenon can be described as a kind of synergistic effect defined as the Mixed Glass Former Effect (MGFE). While production of phosphate and borophosphate glasses are nowhere near the scale of silicate glasses, the vast number of combinations with other oxides make them suitable materials that can be tailor-made for a range of applications. These glasses are commonly used in optoelectronics, as laser glasses, biomaterials, low-temperature sealing glasses, matrices for immobilization of radioactive waste, solid-state electrolytes with high ionic conductivity or precursors for the preparation of