Transmission electron microscopic study of tetracalcium phosphate surface-treated in diammonium hydrogen phosphate solution

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

The present study investigates the changes in microstructure and microchemistry (particularly Ca/P ratio) during whisker formation on the surface of a monolithic TTCP powder in a basic phosphoric acid solution. The XRD results indicate that when TTCP powder was treated for 10 min or less in (NH 4) 2HPO 4 solution, the monolithic TTCP phase remains unchanged. When treated for 30 min, apatite whiskers appear, which continue to grow with treating time. When treated for 24 h, the apatite phase becomes dominant. TEM results show that on the surface of 1 min-treated TTCP are observed a large amount of globular-shaped fine particles which are substantially amorphous with an average Ca/P ratio of about 1.2. When treated for 10 min, whiskers primarily having a crystal structure of TTCP with an average Ca/P ratio of about 2.1 are observed to grow radially from TTCP surface. With time the whiskers continue to grow in length and width. The whiskers on 24h-treated surface become Ca-rich apatite with an average Ca/P ratio of about 1.8. Both TTCP and apatite whiskers are essentially non-stoichiometric in chemistry.

原文English
頁(從 - 到)885-890
頁數6
期刊Materials Transactions
46
發行號4
DOIs
出版狀態Published - 2005 四月

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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