Crystallization behavior and microstructure of silica-free 5K 2O-45CaO-50P2O5 bioglass

Moo Chin Wang, You Cheng Lai, Wei Jen Shih, Ping Yu Shih, Guo Ju Chen, Wang Long Li

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1 Citation (Scopus)


The crystallization behavior and microstructure of silica-free 5K 2O-45CaO-50P2O5 (KCP) bioglass have been studied using differential thermal analysis (DTA), X-ray diffraction (XRD), scanning election microscopy (SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). The activation energy for the KCP bioglass crystallization is found to be 337.4 kJ/mol using a nonisothermal method. The crystalline phases of the glass surface determined by XRD are KCa(PO3)3, 4CaO•3P2O5, and β-Ca(PO3)2 when the KCP bioglass is crystallized at 903 K for 4 hours. The crystalline phase of the powder samples determined by XRD is β-Ca(PO3)2 when silica-free KCP glasses crystallized at 873 to 1073 K for 8 hours. Crystallization starts at the surface of the KCP bioglass and then proceeds toward the interior of the glass matrix. The morphology of β-Ca(PO3)2 is a fibrillar shape 20 to 180 nm in length and 17 to 20 nm in diameter, with an aspect ratio ranging from 1.0 to 10.6.

Original languageEnglish
Pages (from-to)297-307
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number2
Publication statusPublished - 2010 Feb

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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