of increasing ZrO 2 content on the structural features of a rare earths (RE ¼ Nd, La) bearing soda-lime aluminoborosilicate glass was investigated through a multi-spectroscopic approach (Raman, Zr-EXAFS, 29 Si, 11 B, 27 Al and 23 Na MAS NMR). Particular attention was paid to the modifications occurring in the glassy network and on the distribution of Na þ and Ca 2þ ions. Zr 4þ ions were shown to be
通过多光谱方法 (Raman, Zr-EXAFS, 29 Si, 11 B, 27) 研究了增加 ZrO 2 含量对含稀土 (RE ¼ Nd, La) 钠钙铝硼硅酸盐玻璃结构特征的影响Al 和 23 Na MAS NMR)。特别注意发生在玻璃网络中的修饰以及 Na þ 和 Ca 2þ 离子的分布。Zr 4þ 离子被证明位于(ZrO 6) 2A 位点,连接到硅酸盐网络,并优先由Na þ 离子补偿电荷。观察到Zr 4þ 离子与RE 3þ 离子和(BO 4) A 实体对电荷补偿剂的有利竞争,但未检测到对(AlO 4) A 实体的环境产生影响。
X-ray Photoelectron Spectroscopy Study on the Process of Apatite Formation on a Sodium Silicate Glass in Simulated Body Fluid
The process of apatite formation on the surface of Na2O–SiO2 glass in a body environment was investigated, mainly by X-ray photoelectron spectroscopy, as a function of soaking time in a simulated body fluid (SBF). The glass was found to release Na+ ions via exchange with H3O+ ions in the SBF to form Si—OH groups on its surface. These Si—OH groups induced apatite formation indirectly, by forming calcium