Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Characterization of the transformation from calcium-deficient apatite to β-tricalcium phosphate
AU - Gibson, I. R.
AU - Rehman, I.
AU - Best, S. M.
AU - Bonfield, W.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - 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. (C) 2000 Kluwer Academic Publishers.
AB - 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. (C) 2000 Kluwer Academic Publishers.
U2 - 10.1023/A:1008961816208
DO - 10.1023/A:1008961816208
M3 - Journal article
AN - SCOPUS:0034282198
VL - 11
SP - 533
EP - 539
JO - Journal of Materials Science: Materials in Medicine
JF - Journal of Materials Science: Materials in Medicine
SN - 0957-4530
IS - 9
ER -