View More View Less
  • 1 Laboratoire de Thermodynamique Appliquée Faculté des Sciences de Tunis, Département de Chimie, Campus Universitaire Tunis El Manar Tunisie 2092
  • | 2 Laboratoire TECSEN, UMR 6122, CNRS-UPCAM III Marseille Cedex 20 France 13397 Case 251, Avenue Escadrille Normandie-Niemen
  • | 3 Université de Toulon et du Var Laboratoire des Matériaux à Finalités Spécifiques – Matériaux du Milieu Marin La Garde France 83000
Restricted access


Lanthanum-bearing silicate-oxyapatites or britholites, Ca10–xLax(PO4)6–x(SiO4)xO with 1≤x≤6, have been synthesized by solid state reaction at high temperature. They were characterized by X-ray diffraction and IR spectroscopy. Using two microcalorimeters, the heat of solution of these compounds have been measured at 298 K in a solution of nitric and hydrofluoric acid. A strained least squares method was applied to the experimental results to obtain the solution enthalpies at infinite dilution, and the mixing enthalpy in two steps. In the first step the mixing enthalpy obtained is referenced to the britholite monosubstituted and to the oxysilicate. The mixing enthalpy referenced to the oxyapatite and to the oxysilicate is then extrapolated. In order to determine the enthalpies of formation of all the terms of the solution, thermochemical cycles were proposed and complementary experiments were performed. The results obtained show a decrease of the enthalpy of formation with the amount of Si and La introduced in the lattice. This was explained by the difference in the bond energies of (Ca–O, P–O) and (La–O, Si–O).

To see the editorial board, please visit the website of Springer Nature.

Manuscript Submission: HERE

For subscription options, please visit the website of Springer Nature.

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

Monthly Content Usage

Abstract Views Full Text Views PDF Downloads
Feb 2022 1 0 0
Mar 2022 1 0 0
Apr 2022 1 0 0
May 2022 1 0 0
Jun 2022 1 0 0
Jul 2022 2 0 0
Aug 2022 1 0 0