【摘要】 本文利用同步辐射的NaK 边X 射线近边结构 (XANES)谱研究了含Na玻璃 (Na2 O SiO2 P2 O5和Na2 O SiO2 )的NaK 边的特征 ,同时建立了含磷 (P)的钠玻璃中NaK 边的能量 ,其能量位置随着P的含量增加 ,而增大其能量位置。CaMgSi2 O6(Di) NaAlSi3 O8(Ab)玻璃中MgK 边XANES的能量和Mg—O的键长有关系。在Di Ab玻璃中的Mg—O键距是 2± 0 0 4 。表明本方法可以作为研究含Mg玻璃的配位与局部结构新方法更多还原

【Abstract】 The structural role of Na in Na 2O-SiO 2 and Na 2O-SiO 2-P 2O 5 glasses was studied using Na K-edge XANES ( X-ray near edge structure)spectra. The Na K-edge XANES shows little change with increase in the content of Na 2O in Na 2O-SiO 2 glasses. However, the addition of P into the Na 2O-SiO 2 system causes dramatic change of the Na K-edge XANES, and the Na K-edge spectra of Na 2O-SiO 2-P 2O 5 glasses also change with the increase of P 2O 5 content. The structural role of Mg in CaMgSi 2O 6 (Di) - NaAlSi 3O 8 (Ab) glasses was studied using Mg K-edge XANES spectra. The Mg-O bond distance in these glasses is estimated to be 2.00±0.04 . Thus, Mg in these glasses may be five coordinated with oxygen, or Mg may have multiple structural sites, Mg Ⅳ, Mg Ⅴand Mg Ⅵ. The Di-Ab glasses may possess a medium-range ordering structure.更多还原