Abstract
A novel type of adiabatic scanning calorimeter (ASC) based on Peltier elements (PEs) is used to obtain high-resolution enthalpy and heat capacity data on the melting transition of gallium. The accuracy of the specific heat capacity and specific enthalpy is about 2 %, for a sub-mK temperature resolution. The simultaneously determined equilibrium specific heat capacity and specific enthalpy are used to determine the heat of fusion and the purity. In addition, the use of the PE-based ASC as a classical heat step calorimeter and as a constant rate (DSC-type) calorimeter is discussed. A comparison of the ASC results with literature data and DSC data shows the advantages of ASC for the study of phase transitions.
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Notes
The effective C p during a phase transition with a large transition heat in an ASC run is in principle infinite, as \(C_{\text{p}} \sim 1/\dot{T}\), and \(\dot{T} \approx 0\). The actual maximum achieved in this calculation was about \(5.5\times 10^6\hbox{ J g}^{-1}\hbox{ K}^{-1}\), or \(1.3\times 10^5\hbox{ J K}^{-1}\) for C tot as depicted in Fig. 6.
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Acknowledgements
The authors thank Jeroen Sniekers (Department of Chemistry, KU Leuven) for the DSC measurements. This research is supported by the FWO research project—G.0492.10; the FWO research project—G.0360.09; and the KU Leuven research project—OT/11/064.
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Leys, J., Losada-Pérez, P., Glorieux, C. et al. Application of a novel type of adiabatic scanning calorimeter for high-resolution thermal data near the melting point of gallium. J Therm Anal Calorim 117, 173–187 (2014). https://doi.org/10.1007/s10973-014-3654-1
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DOI: https://doi.org/10.1007/s10973-014-3654-1