Aluminophosphate glasses;
Nuclear magnetic resonance;
Zinc phosphate glasses;
Structure;
Properties;
INTERMEDIATE RANGE ORDER;
PHOSPHATE;
D O I:
10.1016/j.jnoncrysol.2013.11.042
中图分类号:
TQ174 [陶瓷工业];
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
The glass forming region of the ZnO-Al2O3-P2O5 (ZAP) system was determined and the structures and properties of the glasses were characterized. For glasses with a constant O/P ratio, i.e., with similar average phosphate anion distributions, and with increasing alumina content, there is an increase in molar volume and glass transition temperature and a decrease in density and refractive index. The structures of the ZAP glasses were charaderized by Raman spectroscopy, P-31 and (27)AI magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and high pressure liquid chromatography (HPLC). Systematically shorter phosphate anions constitute the structures of glasses with greater O/P ratios. The average aluminum coordination number (CNAI) changes systematically with composition, from -4.0 to -5.6, depending on the number of terminal oxygens available to coordinate each Al-cation. Glass properties are sensitive to both the types and concentrations of the P-anions as well as the CNAI. (c) 2013 Elsevier B.V. All rights reserved.