Rosales-Sosa Gustavo A, Masuno Atsunobu, Higo Yuji, Inoue Hiroyuki, Yanaba Yutaka, Mizoguchi Teruyasu, Umada Takumi, Okamura Kohei, Kato Katsuyoshi, Watanabe Yasuhiro
Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan.
Japan Synchrotron Radiation Research Institute, Hyogo, 679-5198, Japan.
Sci Rep. 2015 Oct 15;5:15233. doi: 10.1038/srep15233.
Glasses with high elastic moduli have been in demand for many years because the thickness of such glasses can be reduced while maintaining its strength. Moreover, thinner and lighter glasses are desired for the fabrication of windows in buildings and cars, cover glasses for smart-phones and substrates in Thin-Film Transistor (TFT) displays. In this work, we report a 54Al2O3-46Ta2O5 glass fabricated by aerodynamic levitation which possesses one of the highest elastic moduli and hardness for oxide glasses also displaying excellent optical properties. The glass was colorless and transparent in the visible region, and its refractive index nd was as high as 1.94. The measured Young's modulus and Vickers hardness were 158.3 GPa and 9.1 GPa, respectively, which are comparable to the previously reported highest values for oxide glasses. Analysis made using (27)Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopy revealed the presence of a significantly large fraction of high-coordinated Al in addition to four-coordinated Al in the glass. The high elastic modulus and hardness are attributed to both the large cationic field strength of Ta(5+) ions and the large dissociation energies per unit volume of Al2O3 and Ta2O5.
多年来，具有高弹性模量的玻璃一直备受需求，因为这种玻璃在保持强度的同时可以减薄厚度。此外，建筑物和汽车窗户、智能手机盖板玻璃以及薄膜晶体管（TFT）显示器基板的制造都需要更薄、更轻的玻璃。在这项工作中，我们报道了一种通过气动悬浮制备的54Al2O3 - 46Ta2O5玻璃，它具有氧化物玻璃中最高的弹性模量和硬度之一，同时还展现出优异的光学性能。该玻璃在可见光区域无色透明，其折射率nd高达1.94。测得的杨氏模量和维氏硬度分别为158.3 GPa和9.1 GPa，这与之前报道的氧化物玻璃的最高值相当。使用（27）Al魔角旋转核磁共振（MAS NMR）光谱进行的分析表明，除了玻璃中的四配位Al外，还存在相当大比例的高配位Al。高弹性模量和硬度归因于Ta（5 +）离子的大阳离子场强以及Al2O3和Ta2O5每单位体积的大离解能。
