矿物和玻璃中NaK-边的同步辐射XANES研究  

COORDINATION AND LOCAL STRUCTURE OF Na IN SILICATE MINERALS AND GLASSES

作　　者：彭明生[1] 李迪恩[1] 

机构地区：[1]中山大学地球科学系,广州510275

出　　处：《矿物学报》2001年第2期165-168,共4页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目 (批准号 :49872 0 2 2 )

摘　　要：本文利用同步辐射的NaK 边X射线近边结构谱 (XANES)研究了含Na矿物NaK 边的特征谱 ,其谱的能量位置随着配位数的增加而增大 ,同时建立了含磷 (P)的钠玻璃中NaK 边的能量 ,随着P的含量增加而增大。由此表明本方法可以作为研究含Na矿物和Na玻璃的配位与局部结构的新方法。In this work, NaK\|edge XANES has been applied to studying their local structure and coordination in silicate minerals and glasses. The Na K\|edge peak shifts toward higher energy with increasing coordination from \{\}\+\{\\}Na in scapolite , to \{\}\+\{\\}Na in sodalite, to \{\}\+\{\\}Na in nephline and many other silicates containing \{\}\+\{\\}Na, and to \{\}\+\{\\}Na in albite and cryolite. 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 spectra. The Na\|edge XANES show little change with increasing content of Na\-2O in Na\-2O\|SiO\-2 glasses. However,the addition of P into the Na\-2O\|SiO\-2 system causes a dramatic change in the Na K\|edge XANES, and the Na K\|edge spectra of Na\-2O\|SiO\-2\|P\-2O\-5 glasses also change with increasing P\-2O\-5 content.

关 键 词：钠矿物 玻璃 同步辐射X射线吸收光谱 配位数 NaK-边 能量 局部结构 

分 类 号：P578[天文地球—矿物学] P575.5[天文地球—地质学]