摘要
用二次熔化法制备了不同氮含量的含氨磷酸盐玻璃。对其性能的测试结果表明,由于氮的引入,玻璃的热膨胀系数(α)有所降低,玻璃的转变温度(T_(?))、显微硬度(H_v)、化学稳定性都有不同程度的提高,特别是玻璃在水中的溶解度随含氮量的提高呈急剧下降趋势。玻璃样品的X射线光电子能谱(XPS)、Raman光谱研究表明,氮在此类玻璃中的结构状态与在AlN、S_(13)N_4、BN等晶体氮化物中相似,氮主要以负三价三个耦合键的形式与三个磷原子键合,强有力的P-N键使玻璃的网络结构变得更紧密了。X—тау荧光分析研究结果表明:含氮磷酸盐玻璃中的铝与氧形成了[AlO_4]和[AlO_6],处于六配位的铝的数量稍多一些。
Nitrogen-doped phosphate glasses were prepared by a double melt-quench method. Propertymeasurements show that the addition of nitrogen results in a decrease of the thermal expansion coef-ficiant, but the glass transition temperature, the microhardness and the chemical durability increaseby varying degrees. In particular the solubility in water decreases sharply with nitrogen content.Studies of X-ray phctoelectron spectra and Raman spectra show that the structural state of nitrogenin the phosphate glasses is similar to that in crystalline AIN, Si_3N_4 and 3N and that the majority ofmitrogen atoms are coordinated by three phosphorus atoms, This results in a more highly crosslinkedglass network because of the stronger bond between P and N. X-ray aluorescence analysis indicatesthat the aluminum in the nitrogen-doped phosphate glass is in maxed four and six-fold coordinationand that the number of six-coordinated Al atoms is slightly larger than that of four-coordinated al.
