Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400
Technical report
Coloring Phenomenon of Hydroxyapatite
Tsuyoshi ISHIKAWATetsuro OGAWA
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JOURNAL FREE ACCESS

2004 Volume 112 Issue 1301 Pages 57-60

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Abstract
Hydroxyapatite (HAp) becomes colored after heat treatment; however, the cause of this phenomenon is still unclear. The purpose of this study is to investigate the HAp synthesis conditions under which this phenomenon occurs. In the experiments, color was measured using a color meter and the colored HAp was identified by X-ray diffraction (XRD) analysis. The results show that HAp synthesized by wet process has two colors: red and reddish-brown. In the case of the red HAp, the concentration of red components varied from low to high. On the other hand, for the reddish-brown HAp, the concentration of reddish-brown components was almost constant. The red HAp was observed only when tricalcium phosphate (TCP) was not detected by XRD analysis and SEM.
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© 2004 The Ceramic Society of Japan
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