The LCM (LNE-Cnam joint laboratory) has improved the metrological performance of a standard facility for accurate measurements of the enthalpy of fusion and specific heat in the temperature range [23 °C, 1000 °C]. The metrological approach was to modify a commercial Calvet calorimeter in order to lower the uncertainty of measurement and to insure the metrological traceability of the measurements to the SI units, in particular by designing a new calibration system. This new reference facility and the associated measurement method have been validated by measuring the enthalpies of fusion of pure metals (indium, tin and silver). The results obtained on the three tested pure metallic materials are in very good agreement with data obtained by other National Metrology Institutes.

Key words

enthalpy of fusion
electrical calibration