Spontaneous Crystallization Behavior of Phosphosilicate Glasses

Abstract:

We studied the spontaneous crystallization behavior for 60.5SiO₂-2.5Al₂O₃-3P₂O₅- 18Na₂O-16RMgO-16(1-R)CaO system glasses during cooling of melts through changing the relative content of alkaline-earth oxides. Such compositional variation leads to the formation of different crystalline phases, as well as different degree of crystallization, with the help of X-ray diffraction (XRD), heat capacity (C_p) and scanning electron microscopy (SEM). It is found that the obtained glasses are opalescent due to formation of orthorhombic NaCaPO₄ during cooling when R≤0.5, and the degree of crystallization increases with substituting MgO for CaO. On the other hand, the spontaneous crystallized phases is hexagonal NaCaPO₄ for R=0.75 and is Na₂MgSiO₄ for R=1.0, respectively, and besides, the appearance become transparent.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 1626-1630
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.1626
• Online since: January 2011
• Authors: Shu Jiang Liu, Yan Fei Zhang
• Keywords: Phosphosilicate Glasses, Spontaneous Crystallization, Transparency

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