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The high-temperature heat capacity of natural calcite (CaCO3)

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Abstract

The heat capacity (C P) of a natural sample of calcite (CaCO3) has been measured from 350 to 775 K by differential scanning calorimetry (DSC). Heat capacities determined for a powdered sample and a single-crystal disc are in close agreement and have a total uncertainty of ±1 percent. The following equation for the heat capacity of calcite from 298 to 775 K was fit by least squares to the experimental data and constrained to join smoothly with the low-temperature heat capacity data of Staveley and Linford (1969) (C P in J mol−1 K−1, T in K):

$$\begin{gathered} C_p = - 184.79 + 0.32322T - 3,688,200T^{ - 2} \hfill \\ {\text{ }} - (1.2974{\text{ }} \times {\text{ 10}}^{ - {\text{4}}} )T^2 + 3,883.5T^{ - 1/2} \hfill \\ \end{gathered} $$

Combining this equation with the S 0298 value from Staveley and Linford (1969), entropies for calcite are calculated and presented to 775 K. A simple method of extrapolating the heat capacity function of calcite above 775 K is presented. This method provides accurate entropies of calcite for high-temperature thermodynamic calculations, as evidenced by calculation of the equilibrium: CaCO3 (s)=CaO(s)+CO2 (s).

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Author notes

  1. Gary K. Jacobs

    Present address: Department of Geology, Grand Valley State Colleges, 49401, Allendale, Michigan, USA

  2. Kenneth M. Krupka

    Present address: Department of Water and Land Resources, Battelle Northwest Laboratories, 99352, Richland, Washington, USA

Authors and Affiliations

  1. Department of Geosciences, The Pennsylvania State University, 16802, University Park, Pennsylvania, USA

    Gary K. Jacobs, Derrill M. Kerrick & Kenneth M. Krupka

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  1. Gary K. Jacobs
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  2. Derrill M. Kerrick
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  3. Kenneth M. Krupka
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Jacobs, G.K., Kerrick, D.M. & Krupka, K.M. The high-temperature heat capacity of natural calcite (CaCO3). Phys Chem Minerals 7, 55–59 (1981). https://doi.org/10.1007/BF00309451

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