Crystallization behavior of silica-calcium phosphate biocomposites: XRD and FTIR studies.

C. Q. Ning, Y. Greish, A. El-Ghannam

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Silica and calcium phosphates (CaP) are the most important ingredients in bioactive materials that bond to bone and enhance bone tissue formation. In this study, silica-calcium phosphate (SiO2-CaP) composites were developed by powder metallurgy method, using silica (SiO2) and anhydrous dicalcium phosphate (CaHPO4) powders (CaP) in the ratios (wt%): 20/80, 40/60, 60/40 and 80/20. The effects of temperature and chemical composition on crystallization and phase transformation of the SiO2-CaP composites were evaluated by XRD and FTIR. Thermal treatment of the starting material suggested that CaHPO4 transforms into: gamma-Ca2P2O7 at 800 degrees C; beta-Ca2P2O7 at 1000 degrees C and alpha-Ca2P2O7 at 1200 degrees C. On the other hand, beta-quartz was the only detected phase after thermal treatment of silica in the temperature range 800-1200 degrees C. For all SiO2-CaP composites, SiO2 and CaP did not modify the crystallization behavior of each other when sintered in the temperature range 800-1000 degrees C. However, at 1200 degrees C, CaP promoted the transformation of gamma-quartz into alpha-cristobalite. Moreover, SiO2 stabilized beta-Ca2P2O7. The modifications in the crystallization behavior were related to ion substitution and formation of solid solutions.

Original languageEnglish
Pages (from-to)1227-1235
Number of pages9
JournalJournal of materials science. Materials in medicine
Volume15
Issue number11
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

Fingerprint

Dive into the research topics of 'Crystallization behavior of silica-calcium phosphate biocomposites: XRD and FTIR studies.'. Together they form a unique fingerprint.

Cite this