Vlasenko Viktoriia, Nowagiel Maciej, Wasiucionek Marek, Pietrzak Tomasz K
Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland.
Materials (Basel). 2024 Aug 13;17(16):4023. doi: 10.3390/ma17164023.
Recently, it was shown that the nanocrystallization of Bi2O3 glasses with the addition of SiO2 and Al2O3 leads to the stabilization of the δ-like Bi2O3 phase at least down to room temperature, which is significantly below its stability range in bulk form. In this research, we investigated the properties of bismuthate glasses synthesized with various glass-forming agents such as SiO2, GeO2, B2O3, and Al2O3. It was demonstrated that vitrification of all these systems is possible using a standard melt quenching route. Furthermore, we investigated the crystallization processes in pristine glasses upon increasing the temperature and the thermal stability of arising phases using thermal analysis and high-temperature XRD in situ experiments. It was shown that it is possible to stabilize crystallites' isostructures with δ-Bi2O3 embedded in a residual glassy matrix down to room temperature. The temperature range of the appearance of the δ-like phase strongly depended on the nominal composition of the glasses. We postulate that the confinement effect depends on the local properties of the residual glassy matrix and its ability to introduce sufficient force to stretch the structure of the δ-like Bi2O3 phase in the nanocrystallites.
最近的研究表明，添加SiO₂和Al₂O₃会使Bi₂O₃玻璃发生纳米晶化，从而至少在室温下稳定δ型Bi₂O₃相，而该相在块状形式下的稳定范围远高于室温。在本研究中，我们研究了用SiO₂、GeO₂、B₂O₃和Al₂O₃等各种玻璃形成剂合成的铋酸盐玻璃的性能。结果表明，使用标准的熔体淬火路线可以使所有这些体系玻璃化。此外，我们通过热分析和高温原位XRD实验，研究了原始玻璃在升温过程中的结晶过程以及析出相的热稳定性。结果表明，将嵌入残余玻璃基体中的具有δ-Bi₂O₃结构的微晶稳定至室温是可能的。δ型相出现的温度范围强烈依赖于玻璃的标称组成。我们推测，限制效应取决于残余玻璃基体的局部性质及其对纳米微晶中δ型Bi₂O₃相结构施加足够拉伸力的能力。
