Phase separation and crystallization in the system SiO2-Al2O3-P2O5-B2O3-Na2O glasses |
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Authors: | Shigeki Morimoto |
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Institution: | School of Ceramic Engineering, Institute of Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand |
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Abstract: | The phase separation and crystallization behavior in the system (80 − X)SiO2 · X(Al2O3 + P2O5) · 5B2O3 · 15Na2O (mol%) glasses was investigated. Glasses with X = 20 and 30 phase separated into two phases, one of which is rich in Al2O3-P2O5-SiO2 and forms a continuous phase. Glasses containing a larger amount of Al2O3-P2O5 (X = 40 and 50) readily crystallize and precipitates tridymite type AlPO4 crystals. It is estimated that the phase separation occurs forming continuous Al2O3-P2O5-SiO2 phase at first, and then tridymite type AlPO4 crystals precipitate and grow in this phase. Highly transparent glass-ceramics comparable to glass can be successfully obtained by controlling heat treatment precisely. The crystal size and percent crystallinity of these transparent glass-ceramics are 20-30 nm and about 50%, respectively. |
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Keywords: | 64 75 61 43 81 05 P 78 66 J |
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