掺钕磷酸盐激光玻璃的短期水解及其光电子能谱表征

Short-Time Hydrolization and XPS Characterization for Nd-Doped Phosphate Laser Glass

研究了掺钕磷酸盐激光玻璃主要组成元素在短期水解过程中各自水解浓度的变化,特别是探索了表面结构的光电子能谱表征。作为主要形成体的磷元素,与其他主要修饰体锂、钾、钡等元素类似,具有同样量级的水解速率和逐渐趋于饱和的水解规律。而可能作为形成体和/或修饰体的铝元素,无论是玻璃体还是粉体的表面水解,均表现出一定程度的非单调性质。根据水解后光电子能谱的测定,铝的结合能峰反映出它是同时作为形成体和修饰体存在于掺钕磷酸盐激光玻璃中,并且在短期水解过程中形成体的铝将转变为修饰体的铝。这个结构特点很可能与铝所表现出来的非单调水解性质有关,并且可能是加入氧化铝能够增强磷酸盐玻璃耐水性的一个主要原因。

The varation of main element contents in pure water is measured and analyzed during a short-time hydrolization of Nd-doped phosphate laser glass. To characterize the glass surface structure, X-ray photoelectron spectroscopy（XPS） is used before and after the hydrolization. As the major network former, P5＋shows a similar hydrolization behavior like network modifiers of Li＋, K＋, Ba2 ＋. Their dissolution rates are in the same order of magnitude and their ion concentrations gradually saturate during this short-time hydrolization, in agreement with the typical hydrolization behavior for most of phosphate glasses. Especially for Al in the glass sheets and glass powders, probably as network former and/or modifier, its content in the water shows a non-monotonic relation with hydrolization time. According to XPS analysis for Al2 pbinding energy, Al acts as both network former and network modifier in our Nd-doped phosphate laser glass. Before hydrolization, more Al acts as network former.During the hydrolization process, more Al acts as network modifier. Such a structure characterization may account for its non-monotonic hydrolization behavior, as well as the reason that the water durability can be enhanced by adding Al2O3 into phosphate laser glass.