کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1481555 | 991533 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: 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](/preview/png/1481555.png)
The morphology and dispersion state of Ba2TiSi2O8 (BTS) nanocrystals in transparent glass-ceramics (composition: 40BaO–20TiO2–40SiO2) 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 ~ 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.
► Morphology and dispersion state of Ba2TiSi2O8 nanocrystals in glass-ceramics were clarified.
► Nano-scale deformation behavior was examined using Berkovich nanoindentation technique.
► In the early stage of crystallization, ellipsoid-shaped nanocrystallites were dispersed.
► CSM-type measurements are sensitive in the nano-scaled homogeneity in the samples.
Journal: Journal of Non-Crystalline Solids - Volume 358, Issue 15, 1 August 2012, Pages 1863–1869