Heat-capacity measurements and absolute entropy of epsilon-Mg2PO4OH.

Leyx, C., Van Miltenburg, J. C., Chopin, C. and Cemic, L. (2005) Heat-capacity measurements and absolute entropy of epsilon-Mg2PO4OH. Physics and Chemistry of Minerals, 32 (1). pp. 13-18. DOI 10.1007/s00269-004-0432-9.

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Abstract

The low-temperature heat capacity of epsilon-Mg2PO4OH was measured between 10 and 400 K by adiabatic calorimetry. No phase transition was observed over this temperature range. A relative enthalpy increment of 22,119 J mol(-1) and an absolute entropy value of 127.13 +/- 0.25 J mol(-1) K-1 at 298.15 K are derived from the results. The low-temperature heat-capacity data are compared with the DSC data obtained from 143 K to 775 K and show marginal differences in the common temperature range. The latter data are fitted by the polynomial C-p = {316.62 - 2957 T-0.5 - 563350 T-2 + 955.55 x 10(5) T-3} J K-1 mol(-1), which allows extrapolation to high temperatures.

Document Type: Article
Keywords: adiabatic calorimetry DSC calorimetry magnesium phosphate heat capacity entropy magnesium phosphate cement high-pressure phase high-temperature crystal-structure system calorimetry minerals
Research affiliation: Kiel University
Date Deposited: 18 Jan 2012 05:08
Last Modified: 23 Sep 2019 17:10
URI: https://oceanrep.geomar.de/id/eprint/16080

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