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FTIR study of carbonate loss from carbonated apatites in the wide temperature range
Author(s) -
Rau J.V.,
Cesaro S. Nunziante,
Ferro D.,
Barinov S.M.,
Fadeeva I.V.
Publication year - 2004
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30111
Subject(s) - apatite , atmospheric temperature range , thermal decomposition , materials science , fourier transform infrared spectroscopy , carbonate , sintering , thermal stability , decomposition , chemical engineering , phase (matter) , carbon fibers , precipitation , carbon monoxide , mineralogy , chemistry , composite number , catalysis , metallurgy , organic chemistry , thermodynamics , composite material , physics , meteorology , engineering
The mineral constituent of bone tissue is a carbonate‐substituted apatite (CHA). The thermal stability of the CHA has been revealed to depend on the substitution type and degree, although relatively little is known about this behavior. The aim of this study was to investigate the carbonate loss from synthetic CHAs in equilibrium conditions in a wide temperature range. An approach based on FTIR spectroscopy of condensed gas phase was applied to evaluate the CO and CO 2 release with increasing temperature. Four different CHAs were studied, which were prepared by either precipitation from solution or the solid‐state interaction. The samples differ from each other by the substitution degree. In one of the samples calcium was partially substituted by magnesium. Decomposition was shown to start at surprisingly low temperature, about 400°C, and the CO content increases monotonously with the increase of temperature. The CO 2 content goes through a maximum due to its decomposition into carbon monoxide and oxygen, the temperature of this maximum being strongly dependent on the chemical synthesis route. Therefore, control of the sintering atmosphere with respect to the CO 2 /CO ratio is needed when preparing the carbonated apatite bioceramics. © 2004 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 71B: 441–447, 2004