Abstract
A new model for the location and distribution of carbonate ions in carbonated apatite was used to assign the IR spectra of A- and AB-carbonated apatites. The percentage of total carbonate as measured by the mass loss in the TGA of these compounds is in good agreement with the percentage obtained by combustion analysis. The decomposition of pure A-type carbonate appears at temperatures of 985–1123 °C, whereas the decomposition of AB-type carbonated apatites occurs in the range of 600–800 °C. This difference is attributed to changes in the environment of channel carbonate brought about by B-type substitution of carbonate for phosphate. In the presence of sodium ions, the channel is changed by substitution of sodium for calcium in order to accommodate the difference between the charge of the carbonate and phosphate ions. A thermodynamic cycle is introduced to rationalize the differences in decomposition temperatures of A- and B-type carbonate. Preferential loss of B-type carbonate upon heating to 600 °C also suggests the migration of B-type carbonate to A-sites.
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Acknowledgements
The authors are indebted to the Camille and Henry Dreyfus Foundation for a Senior Scientist Mentor award (CHY) and to the Lucille and William Hackman Summer Research Program and the Yoder Student Research Endowment at Franklin & Marshall College for funding.
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Yoder, C.H., Stepien, K.R. & Edner, T.M. A new model for the rationalization of the thermal behavior of carbonated apatites. J Therm Anal Calorim 140, 2179–2184 (2020). https://doi.org/10.1007/s10973-019-08946-7
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DOI: https://doi.org/10.1007/s10973-019-08946-7