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A study on the phase transformation of the nanosized hydroxyapatite synthesized by hydrolysis using in situ high temperature X-ray diffraction

✍ Scribed by Wei-Jen Shih; Jian-Wen Wang; Moo-Chin Wang; Min-Hsiung Hon

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 351 KB
Volume: 26
Category: Article
ISSN: 0928-4931
DOI: 10.1016/j.msec.2005.08.005

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✦ Synopsis

The biodegradable hydroxyapatite (HA) was synthesized by hydrolysis and characterized using high temperature X-ray diffraction (HT-XRD), differential thermal analysis and thermogravimetry (DTA/TG), and scanning electron microscopy (SEM). The in situ phase transformation of the HA synthesized from CaHPO 4 I2H 2 O (DCPD) and CaCO 3 with a Ca / P= 1.5 in 2.5 M NaOH (aq) at 75 -C for 1 h was investigated by HT-XRD between 25 and 1500 -C. The HA was crystallized at 600 -C and maintained as the major phase until 1400 -C. The HA steadily transformed to the a-tricalcium phosphate (a-TCP) which became the major phosphate phase at 1500 -C. At 700 -C, the minor CaO phase appeared and vanished at 1300 -C. The Na + impurity from the hydrolysis process was responsible for the formation of the NaCaPO 4 phase, which appeared above 800 -C and disappeared at 1200 -C.

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