High temperature characteristics of synthetic hydroxyapatite

✍ Scribed by Jiming Zhou; Xingdong Zhang; Jiyong Chen; Shaoxian Zeng; K. Groot

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 300 KB
• Volume: 4
• Category: Article
• ISSN: 0957-4530
• DOI: 10.1007/bf00122983

✦ Synopsis

The characteristics of synthetic hydroxyapatite sintered at high temperature were studied by means of X-ray diffraction, infrared and differential thermal analysis, and thermogravimetric analysis. The results show that synthetic HAp with a Ca/P ratio near 1.67 is stable when sintered in dry or wet air below 1200°C. Even after long times, no tricalcium phosphate (TCP) can be observed. Beyond 1200 "C, HAp loses its OH groups gradually and is transformed to oxyapatite [Ca,,O (PO,), or Ca ( P0,)60. 01. At 1450 "C oxyapatite dissociates into the products a-Ca, (PO,),, Ca,P,O, and Ca,P,O,.