Szumera Magdalena
Department of Ceramics and Refractories, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 25;137:111-5. doi: 10.1016/j.saa.2014.08.038. Epub 2014 Aug 29.
Glasses have been synthesized in the system P2O5-SiO2-K2O-MgO-CaO modified by addition of MoO3. Glasses were prepared by conventional fusion method from 40 g batches. The influence of Mo-cations on the analysed glass structure was investigated by means of Raman and (31)P MAS-NMR techniques. It has been found that molybdate units can form Mo[MoO4/MoO6]-O-P and/or Mo[MoO4/MoO6]-O-Si bonds with non-bridging oxygens atoms of Q2 methaphosphate units, resulting in the transformation of chain methaphosphate structure into pyrophosphate and finally into orthophosphate structure. It has been also found that increasing amount of MoO3 in the structure of investigated glasses causes their gradual depolymerization and molybdenum ions in the analysed glass matrix act as modifying cations.
通过添加MoO₃对P₂O₅-SiO₂-K₂O-MgO-CaO体系进行改性，合成了玻璃。采用传统熔融法，以40克批次制备玻璃。借助拉曼光谱和³¹P MAS-NMR技术研究了钼阳离子对所分析玻璃结构的影响。已发现钼酸根单元可与Q₂偏磷酸单元的非桥连氧原子形成Mo[MoO₄/MoO₆]-O-P和/或Mo[MoO₄/MoO₆]-O-Si键，导致链状偏磷酸结构转变为焦磷酸结构，最终转变为正磷酸结构。还发现，在所研究玻璃结构中增加MoO₃的含量会导致其逐渐解聚，且所分析玻璃基体中的钼离子起到改性阳离子的作用。
