caa a22 4500 47578247X CHVBK 20180406123648.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1023/A:1008961816208 doi (NATIONALLICENCE)springer-10.1023/A:1008961816208 Characterization of the transformation from calcium-deficient apatite to β-tricalcium phosphate [Elektronische Daten] [I. Gibson, I. Rehman, S. Best, W. Bonfield*] The structural changes that occur during the transformation of a Ca-deficient apatite, prepared by a wet chemical method, to β-TCP were investigated. X-ray diffraction (XRD) analysis of as-prepared samples and samples calcined at temperatures between 500 and 1100 °C showed that the transformation occurs over the temperature range 710-740 °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 °C. Even once a single β-TCP phase is obtained at 740 °C there remains a considerable amount of structural change at temperatures between 740 and 1100 °C. This effect was illustrated by an unusual change in the lattice parameters of the β-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 experimental techniques of XRD and FTIR are excellent complimentary methods for characterizing structural changes that occur during phase transformations. Kluwer Academic Publishers, 2000 Gibson I. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut Rehman I. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut Best S. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut Bonfield* W. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/9(2000-09-01), 533-539 0957-4530 11:9<533 2000 11 10856 https://doi.org/10.1023/A:1008961816208 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008961816208 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gibson I. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut NATIONALLICENCE 700 1- Rehman I. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut NATIONALLICENCE 700 1- Best S. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut NATIONALLICENCE 700 1- Bonfield* W. IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, E1 4NS, London, UK aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/9(2000-09-01), 533-539 0957-4530 11:9<533 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 47578247X BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer