標題: Transformation mechanism of different chemically precipitated apatitic precursors into beta-tricalcium phosphate upon calcination
作者: Liou, SC
Chen, SY
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Ca-deficient apatite;beta-tricalcium phosphate;JMA equation;transformation kinetics
公開日期: 1-Dec-2002
摘要: The Ca-deficient apatite (CDHA) was prepared from the precursors of (CH3COO)(2)Ca - xH(2)O, Ca(NO3)(2).4H(2)O and H3PO4, (NH4)H2PO4 to investigate the transformation mechanism of beta-tricalcium phosphate (beta-TCP). X-ray diffraction analysis shows that the development of beta-TCP is not via direct reaction between Ca and P for all the different combinations between Ca and P precursors. The activation energy of beta-TCP formation with (NH4)H2PO4 as precursor was higher than that with H3PO4. Following the Johnson-Mehl-Avrami equation, the reaction kinetics of beta-TCP phase formation is found one-dimension growth with interface-controlled and diffusion controlled growth depending on the annealing temperature. There exists a transition between 750 degreesC and 825 degreesC, and the transition rate from interface-controlled to diffusion-controlled growth is precursor-dependent. (C) 2002 Elsevier Science Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/S0142-9612(02)00198-9
http://hdl.handle.net/11536/28346
ISSN: 0142-9612
DOI: 10.1016/S0142-9612(02)00198-9
期刊: BIOMATERIALS
Volume: 23
Issue: 23
起始頁: 4541
結束頁: 4547
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