For the sake of ensuring improved accuracy and traceability for temperature measurements above the copper point (1084°C), four laboratories are joining their efforts in developing high-temperature fixed points based on eutectic transitions of metal-carbon mixtures [1]. These phase transitions, on the basis of radiation thermometry results presented thus far [2,3], encouraged the participants to work towards two eventual applications: high-temperature fixed-point calibration sources for radiation thermometry, and fixed points for the calibration of contact thermometers, including Pt/Pd, Pt/Rh and W/Re thermocouples. Here will be given the up-to-date works accomplished within or in relation with this project in the participating laboratories. The perspectives of this work are wide and should allow the usage of such fixed points at temperatures ranging from 1150°C to 2700°C. The remaining uncertainty concerns the metrological viabilities of these phase transitions in terms of reproducibility and reliability. The future comparisons among the participating laboratories will hopefully allow us to brush aside this uncertainty.
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