Abstract
The comparison of Re–C fixed-point cells built at NMIJ and VNIIOFI was carried out. Both cells were built using 5N purity rhenium of the same supplier, and the crucibles had similar dimensions. The cells were heated in the same furnace and measured on consecutive days using a radiation thermometer. To eliminate the effect of possible instability of the thermometer, a third Re–C cell was used as a reference: it was placed in another furnace and was measured each day just after the cell to be compared. The melting-temperature difference of the NMIJ cell to the VNIIOFI cell was 0.045 °C with a standard uncertainty of 0.033 °C. In the course of this comparison, a comparison of the temperature scales between the NMIJ and the VNIIOFI at the Re–C point (2475 °C) was performed using the NMIJ Re–C cells as transfer standards. The difference between the NMIJ and the VNIIOFI scales was found to be −0.8 °C, which was within the combined uncertainty of 1.4 °C (k = 2).
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Khlevnoy, B.B., Yamada, Y., Grigoryeva, I.A. et al. Comparison of Re–C Fixed-Point Cells and Their T90 Temperatures Between NMIJ and VNIIOFI. Int J Thermophys 32, 1753–1762 (2011). https://doi.org/10.1007/s10765-011-1038-3
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DOI: https://doi.org/10.1007/s10765-011-1038-3