Abstract
Glasses were prepared with compositions (50−0.5 x) CaO.(50−0.5 x) P2O5 · x B2O3 with B2O3 contents (x) from 0 to 45 mol%. The glass transformation temperature (T g), dilatational softening temperature (T D) and Vickers hardness (H V) initially increased with x, but showed maxima at about x=20 for T g and T D and at about x=35 for H V. The thermal expansion coefficient decreased with x, levelling off at about 35 mol% B2O3. The maximum tendency to crystallize occurred at around 25 mol% B2O3. Volume nucleation (and hence glass-ceramic formation) and surface nucleation were obtained for x between 15 and 25 mol%. The first phase to appear was BPO4, which was probably homogeneously nucleated. Subsequently the 4CaO · P2O5 phase was heterogeneously nucleated on the BPO4. For 10⩾ x ⩾35 only surface nucleation was observed. The kinetics of nucleation were investigated in the 20 mol% B2O3 glass. The changes in properties and crystallisation behaviour with B2O3 content were related to short-range structural information. Infrared spectra and literature data indicated a threedimensional network of B-O-B and B-O-P linkages in the glasses.
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Shi, W., James, P.F. Crystallization and properties of CaO-P2O2-B2O3 glasses. JOURNAL OF MATERIALS SCIENCE 28, 469–476 (1993). https://doi.org/10.1007/BF00357825
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DOI: https://doi.org/10.1007/BF00357825