Controlling the Size of Nanodomains in Calcium Aluminosilicate Glasses

详细信息    查看全文

• 作者：Laura Martel ; Mathieu Allix ; Francis Millot ; Vincent Sarou-Kanian ; Emmanuel Ve虂ron ; Sandra Ory ; Dominique Massiot ; Michae虉l Deschamps
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：October 6, 2011
• 年：2011
• 卷：115
• 期：39
• 页码：18935-18945
• 全文大小：1202K
• 年卷期：v.115,no.39(October 6, 2011)
• ISSN：1932-7455

文摘

Transparent nanostructured glasses show interesting properties for optical fibers or laser beam applications. Binary calcium silicate glasses are known to undergo phase separation in silica-rich compositions. However, adding up to a few mole percent of alumina seems to inhibit the phase separation. By adjusting the amount of alumina added to demixing calcium silicate glasses, we managed to obtain transparent, but nanostructured, glasses with either silica-rich or calcium aluminosilicate-rich nanodomains of a controlled size down to 5 nm for compositions beyond the limits of the immiscibility domain. Therefore, the limits of the immiscibility domain of the SiO₂鈥揂l₂O₃鈥揅aO ternary diagram must be extended to consider the presence of nanosized domains. An atomic-scale analysis of these glasses was performed using ²⁹Si and ²⁷Al nuclear magnetic resonance (NMR) experiments, showing that, as the size of the domains decreased, repolymerization of the silicon network and formation of aluminum-rich clusters were observed.