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  • 1 Applied Thermodynamics Laboratory, Department of Chemistry, Faculty of Science, Tunis-El Manar University, 2092, Tunis El Manar, Tunisia
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Abstract

A series of “B” type carbonate fluorapatites (B–CO3–Fap) have been synthesized and characterized by X-ray diffraction, infrared spectroscopy, and chemical analysis. The thermochemical study of phosphoric acid attack of the products was performed by a 19% w/w P2O5 solution on raw and deconvoluted curves. The calculated thermogenesis curves show one, two, or four peaks, depending on the mass of dissolved solid and the carbonate content in B–CO3–Fap. The plot of the quantity of heat measured by integrating the raw signal as a function of the dissolved mass in the same volume solution presents three straight segments for low-carbonated and two segments for moderately carbonated ones. From the slopes of line segments, it was possible to determine the enthalpies of dissolution of “B” type carbonate fluorapatites and to deduce that of precipitation of CaF2 and Ca(H2PO4)2·H2O, which have been compared to directly measured or literature data.

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  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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