矿物和玻璃中NaK-边的同步辐射XANES研究

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垢增加而增大,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。

COORDINATION AND LOCAL STRUCTURE OF Na IN SILICATE MINERALS AND GLASSES

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.