摘要
本文采用同步辐射的 Si K-边 X-射线吸收近边结构 (XANES)谱研究了 Si在 Si O2 - P2 O5 和 Na2 O-Si O2 - P2 O5 的低压磷硅酸盐玻璃中结构与配位 ,以及 Si的配位几何随玻璃中 P2 O5 含量而变化 :同步辐射的 AlK-边 XANES谱研究了 Al在铝硅酸盐成分为 Na Al Si2 O6 - Na Al Si3O8的玻璃和熔体中的配位和局部结构 ,并提供了直接的实验证据来证明该成分的玻璃体系中由于压力的变化所诱导 Al配位的变化。
The coordination and local structure of Si and A l in silicate glasses and melts have been studied using Si and Al K-edge X-ray absorption spectroscopy for the first time.It has been verified that in SiO 2 -P 2O 5 and Na 2O-SiO 2-P 2O 5 join phosphate silicate glasses,Si atoms remains tetrahedrally coordinated with oxygen when the content of P 2O 5 is b elow 32 mol%,but partial Si atoms become octahedrally coordinated with oxygen wh en the content of P 2O 5 increases above 32 mol%,and the proportion of the oct ahedrally coordinated Si atoms increases with the increasing content of P 2O 5 .It has also been demonstrated that Al remains four-fold coordinated with oxyge n in ambient NaAlSi 2O 6-NaAlSi 3O 8 glasses,but in the same composition gl asses quenched at 4.4 GPa and 1 575 ℃,partial Al atoms becomes five- and six -fold coordinated with oxygen,and at the same pressure and temperature,the prop ortions of five- and six-fold coordinated Al atoms increases with the increasi ng content of NaAlSi 2O 6 in the glasses.Thus,the pressure-induced coordinati on change of Al in aluminosilicate glasses and melts has been observed for the f irst time by Al K-edge X-ray absorption spectroscopy.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期402-405,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金!(批准号 495 72 0 94)
关键词
硅酸盐玻璃
硅
铝
配位
结构
X-射线吸收光谱
Silicate glasses and melts
Coordination of Si and Al
X-ray absorption spectroscopy
