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Purity test of precipitated apatites by TG/DTA/EGA–MS

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Abstract

Pure Ca hydroxyapatites (CaHAp) and Na-, Mg-, Zn- and Sr-substituted precipitated apatites were characterized by X-ray diffraction analysis, Fourier transformed infrared spectroscopy and element, chemical, and TG/DTA–EGA–MS analysis at their heating up to 1200 °C in Ar atmosphere. The evolvement of H2O, CO2, NH3, and NxOy was followed by mass spectroscopy (MS). Comparison of thermal behavior of pure CaHAps and cation-substituted apatites indicates that the exact temperatures of the release of gases (thermal stability) depend strongly on the chemical composition and crystallinity of sample. The presence of nitrogen species was detected by TA–MS in all precipitated apatites, and its content (0.01–1 %) depends on the synthesis conditions, the washing profoundness as well as on the cationic composition of apatite.

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Acknowledgements

This work was supported by the Estonian Ministry of Education and Science Project IUT33-19 and ERMOS Grant No. GJE131.

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Authors and Affiliations

  1. Laboratory of Inorganic Materials, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia

    Kaia Tõnsuaadu & Irma Bogdanoviciene

  2. Materials Research Center, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia

    Rainer Traksmaa

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  1. Kaia Tõnsuaadu
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  2. Irma Bogdanoviciene
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  3. Rainer Traksmaa
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Correspondence to Kaia Tõnsuaadu.

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Tõnsuaadu, K., Bogdanoviciene, I. & Traksmaa, R. Purity test of precipitated apatites by TG/DTA/EGA–MS. J Therm Anal Calorim 125, 919–925 (2016). https://doi.org/10.1007/s10973-016-5447-1

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  • DOI: https://doi.org/10.1007/s10973-016-5447-1

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