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URN etd-0728105-173415 Statistics This thesis had been viewed 3584 times. Download 2698 times. Author Yu-Kuang Ko Author's Email Address email@example.com Department Materials Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 94 Title Analysis of Nanostructure and Nucleating Number Density of Transparent Glass-Ceramics by Atomic Force Microscopy Keyword transparent glass-ceramics nucleating number density nanostructure atomic force microscopy AFM AFM atomic force microscopy nanostructure nucleating number density transparent glass-ceramics Abstract The objective of the thesis is to examine the nucleation density of nanocrystalline glass-ceramics by atomic force microscopy (AFM). Nanocrystalline glass-ceramics have ultra-high nucleation density, optical transparency, ultra-smooth surface, and special properties related to the small crystal size. Two nanocrystalline glass-ceramic systems were investigated in the thesis: mullite glass-ceramics in the system SiO2-Al2O3-B2O3-ZnO-K2O and spinel glass-ceramics in the system MgO-ZnO-Al2O3-SiO2-TiO2. The basic reasons for utilizing AFM in the thesis are its atomic resolution and the ability of examining nonconductive materials under various environments. The experiment results indicate that, after two-stage heat treatment (nucleation and crystal growth), the number of nuclei increased with the increase in nucleating temperature for the mullite glass-ceramics. The number of nuclei reached a maximum at 750°C for the spinel glass-ceramics. Mullite glass-ceramics revealed a maximum number of nuclei when the glass was crystallized at 850°C. It was found that the nucleation-temperature curves derived from AFM analysis are qualitatively consistent with those from DTA. It is concluded that AFM technique is useful for examining the crystal nucleation kinetics of nanocrystalline glass-ceramics. Advisor Committee Jiin-Jyh Shyu - advisor
Jyh-Wei Lee - co-chair
Ping-Yu Shih - co-chair
Files Date of Defense 2005-06-30 Date of Submission 2005-07-28