THE SHORT-RANGE STRUCTURE OF SODIUM ULTRAPHOSPHATE GLASSES

被引:162
作者
BROW, RK
TALLANT, DR
HUDGENS, JJ
MARTIN, SW
IRWIN, AD
机构
[1] IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011
[2] BUTLER UNIV,DEPT CHEM,INDIANAPOLIS,IN 46208
关键词
D O I
10.1016/0022-3093(94)90534-7
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
Anhydrous sodium ultraphosphate glasses were prepared with Na,O contents between O and 50 mol% and were characterized by several structurally sensitive spectroscopic probes to determine the nature of the phosphate tetrahedra that constitute the short-range glass structure. Solid state P-31 magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy reveals that Na2O depolymerizes the branched (Q(3)) P-O network of P2O5 to form metaphosphate (Q(2)) sites, in quantitative agreement with Van Water's 'chemically simple' model. X-ray photoelectron spectroscopy reveals that the concomitant increase in non-bridging oxygen with increasing Na2O content is also in quantitative agreement with this structural model. Raman spectroscopic analyses of glasses with approximately 40 mol% Na2O suggest that some intermediate-range order, perhaps associated with strained rings, also exists within the glass network. Strained sites are eliminated when the solid glass is heated to melt temperatures.
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页码:221 / 228
页数:8
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