The novel materials of different phase transition temperatures are exploited in thermometry as defined fixed points to form the International Temperature Scales (ITS). In the high-temperature range above the copper fixed point (1084.62 degrees C), melting transition temperatures of metal-carbon (M-C) eutectics are evolved as reference fixed points to disseminate T-90 and thermodynamic temperature (T). This paper presents the development and realization parameters of Ni-C eutectic fixed point cells for thermocouple thermometry. These cells are successfully fabricated using a single (NPLI Ni-C-01) and multiple filling (NPLI Ni-C-02) approaches, and optimization of various parameters such as repeatability of melting and freezing, long-term stability, heat-flux effect, and cell realization uncertainty are reported. The assigned temperatures to single and multiple-filled fixed point cells using Type-S-TC are 1328.29 degrees C +/- 0.59 degrees C and 1328.46 degrees C +/- 0.59 degrees C, respectively. The results obtained for in-house developed NPLI Ni-C cells are in excellent agreement with the other NMIs and will support the assignment of temperature to Ni-C fixed point in future ITS.
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