Orientated crystallization of fresnoite glass-ceramics by using a thermal gradient |
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| Affiliation: | 1. Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan;2. BAM Federal Institute for Materials Research and Testing, 12489 Berlin, Germany;1. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China;2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China;3. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China |
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| Abstract: | The glass with chemical composition (mol%) 33.33 BaO, 16.66 TiO2, 50.00 SiO2 was prepared by a conventional melt-quenching method. The glass-ceramics with a Ba2TiSi2O8 crystal was prepared by crystallization of the glasses using a hot stage. The crystals are shown highly orientated along the c-axis perpendicular to the hot surface of the sample. Crystallization was controlled by a diffusion process with surface nucleation. The activation energy for crystallization was about 518 kJ/mol. The mechanism of oriented crystallization was considered in the present paper. |
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