Crystallization Behavior of CaO–P2O5 Glass with TiO2, SiO2, and Al2O3 Additions |
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Authors: | Y. Nan William E. Lee Peter F. James |
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Affiliation: | School of Materials, University of Sheffield, Sheffield, S10 2TZ, United Kingdom |
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Abstract: | TiO2 above 4 mol% is an effective nucleating agent for CaO–P2O5 glass which also contains substantial SiO2 and Al2O3 additions. Glass ceramics can be made from this glass using a single slow heating ramp with no need for a nucleating heat treatment step. Powder of this composition crystallizes rapidly to β-Ca2P2O7, whereas bulk glass crystallizes from diphasic nuclei consisting of a central cubic Ca-P-Ti-Si-Al oxide phase surrounded by impure AlPO4 dendrites. Metastable calcium phosphate grows on the AlPO4 dendrites and later transforms to β-Ca2P2O7. |
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Keywords: | crystallization glass calcium phosphate bioceramics titania |
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