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Transformation mechanism of different chemically precipitated apatitic precursors into β-tricalcium phosphate upon calcination

Paper ID Volume ID Publish Year Pages File Format Full-Text
13087 829 2002 7 PDF Available
Title
Transformation mechanism of different chemically precipitated apatitic precursors into β-tricalcium phosphate upon calcination
Abstract

The Ca-deficient apatite (CDHA) was prepared from the precursors of (CH3COO)2Ca·xH2O, Ca(NO3)2·4H2O and H3PO4, (NH4)H2PO4 to investigate the transformation mechanism of β-tricalcium phosphate (β-TCP). X-ray diffraction analysis shows that the development of β-TCP is not via direct reaction between Ca and P for all the different combinations between Ca and P precursors. The activation energy of β-TCP formation with (NH4)H2PO4 as precursor was higher than that with H3PO4. Following the Johnson–Mehl–Avrami equation, the reaction kinetics of β-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°C and 825°C, and the transition rate from interface-controlled to diffusion-controlled growth is precursor-dependent.

Keywords
Ca-deficient apatite; β-tricalcium phosphate; JMA equation; Transformation kinetics
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Transformation mechanism of different chemically precipitated apatitic precursors into β-tricalcium phosphate upon calcination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 23, December 2002, Pages 4541–4547
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
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