Morphology and dispersion state of Ba2TiSi2O8 nanocrystals in transparent glass-ceramics and their nanoindentation behavior
Morphology and dispersion state of Ba2TiSi2O8 nanocrystals in transparent glass-ceramics and their nanoindentation behavior
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DOI：
10.1016/j.jnoncrysol.2012.05.040
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发表时间：
2012-08-01
影响因子：
3.5
通讯作者：
Komatsu, Takayuki
中科院分区：
文献类型：
--
作者：
Shinozaki, Kenji;Honma, Tsuyoshi;Komatsu, Takayuki
通过高分辨率透射电子显微镜观察观察透明微晶玻璃（成分：40BaO-20TiO(2)-40SiO(2)）中Ba2TiSi2O8（BTS）纳米晶体的形貌和分散状态，并使用Berkovich纳米压痕技术（标准型和连续刚度测量（CSM）型）检查其纳米级变形行为。结晶初期，表面形成厚度约120 nm的BTS晶层，玻璃基体中分散有直径100-200 nm的椭球状微晶。后期，直径为200-400 nm的BTS晶体致密形成，但BTS晶体之间存在玻璃相。根据约 100 nm 变形尺度的 CSM 型纳米压痕测量评估的杨氏模量显示，玻璃的杨氏模量值为 98 GPa，纳米晶体玻璃陶瓷的杨氏模量值为 110 GPa。有人认为，CSM 型测量对于热处理样品的纳米级均匀性非常敏感。 (C) 2012 Elsevier B.V. 保留所有权利。
The morphology and dispersion state of Ba2TiSi2O8 (BTS) nanocrystals in transparent glass-ceramics (composition: 40BaO-20TiO(2)-40SiO(2)) were examined from high resolution transmission electron microscope observations, and their nano-scale deformation behavior was examined using Berkovich nanoindentation technique (standard-type and continuous stiffness measurement (CSM)-type). In the early stage of crystallization, BTS crystalline layers with a thickness of similar to 120 nm were formed at the surface and ellipsoid-shaped crystallites with a diameter of 100-200 nm were dispersed in the glass matrix. In the late stage, BTS crystals with a diameter of 200-400 nm were formed densely, but a glassy phase was present between BTS crystals. The Young's modulus evaluated from CSM-type nanoindentation measurements for a deformation scale of about 100 nm shows the values of 98 GPa for the glass and 110 GPa for the glass-ceramics with nanocrystals. It was suggested that CSM-type measurements are very sensitive in the nano-scaled homogeneity in the heat-treated samples. (C) 2012 Elsevier B.V. All rights reserved.