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Application of a novel type of adiabatic scanning calorimeter for high-resolution thermal data near the melting point of gallium

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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

  1. 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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  1. Patricia Losada-Pérez

    Present address: Institute for Materials Research IMO, Hasselt University, Wetenschapspark 1, 3590, Diepenbeek, Belgium

Authors and Affiliations

  1. Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, KU Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium

    Jan Leys, Patricia Losada-Pérez, Christ Glorieux & Jan Thoen

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  1. Jan Leys
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Correspondence to Jan Leys.

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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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