PMID: 15348382Sep 7, 2004Paper

Characterization of the transformation from calcium-deficient apatite to beta-tricalcium phosphate

Journal of Materials Science. Materials in Medicine
I R GibsonW Bonfield

Abstract

The structural changes that occur during the transformation of a Ca-deficient apatite, prepared by a wet chemical method, to beta-TCP were investigated. X-ray diffraction (XRD) analysis of as-prepared samples and samples calcined at temperatures between 500 and 1100 degrees C showed that the transformation occurs over the temperature range 710-740 degrees C, under non-equilibrium conditions. The change in crystallite size with increasing calcination/sintering temperature was studied by XRD using the Scherrer formula. Fourier transform infra-red (FTIR) analysis indicated considerable structural change in samples above and below this temperature range. Changes were observed in the hydroxyl, carbonate and phosphate bands as the calcination temperature was increased from 500 to 1100 degrees C. Even once a single beta-TCP phase is obtained at 740 degrees C there remains a considerable amount of structural change at temperatures between 740 and 1100 degrees C. This effect was illustrated by an unusual change in the lattice parameters of the beta-TCP structure and significant changes in the phosphate bands of the FTIR spectra as the calcination temperature was increased. The results obtained in this study show that the combined experi...Continue Reading

Citations

Sep 28, 2007·Journal of Materials Science. Materials in Medicine·R W N Nilen, P W Richter
Mar 24, 2007·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Masato TamaiToshie Tsuchiya
Mar 1, 2012·Journal of Biomedical Materials Research. Part a·Balu VenugopalAnnie John
Dec 3, 2016·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Christoph StähliNicola Döbelin

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