Heat capacity measurements of CaAlSiO4F from 5 to 850 K and its standard entropy

Peter Tropper*, Ulrike Troitzsch, Edgar Dachs, Artur Benisek

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    Heat capacity (CP) data of Al-F-bearing titanite are presented that yield the standard entropy S298.15° of F-Al-titanite CaAlFSiO4 (FAT). CP of synthetic FAT was measured with relaxation calorimetry and differential scanning calorimetry between 5 and 764 K. The results constrain S298.15° to be 115.4 ± 2.0 J/(mol·K) and subsequently the standard Gibbs free energy of formation from the elements, ΔfG°, of CaAlSiO4F to be between -2583 ± 3.0 and -2588 ± 3.0 kJ/mol, and the standard enthalpy of formation from the elements, ΔfH°, to lie between -2728 ± 3.0 and -2733 ± 3.0 kJ/mol depending on the thermodynamic data retrieval approach. These data, in turn, can be used to quantitatively model high-grade and UHP fluid-rock interaction. The calculation of future petrogenetic grids involving F-bearing minerals and titanite solid solutions in the system CaTiSiO4O-CaAlSiO4F will only be possible by expanding existing internally consistent thermodynamic databases to the F-system.

    Original languageEnglish
    Pages (from-to)1165-1168
    Number of pages4
    JournalAmerican Mineralogist
    Issue number7
    Publication statusPublished - 26 Jul 2018


    Dive into the research topics of 'Heat capacity measurements of CaAlSiO4F from 5 to 850 K and its standard entropy'. Together they form a unique fingerprint.

    Cite this