Woolliams, E R; Anhalt, K*; Ballico, M*; Bloembergen, P*; Bourson, F*; Briaudeau, S*; Campos, J*; Cox, M G; de Campo, D*; Dong, W*; Dury, M; Gavrilov, V*; Grigoryeva, I*; Hernanz, M L*; Jahan, F*; Khlevnoy, B*; Khromchenko, V*; Lowe, D H; Lu, X*; Machin, G; Mantilla, J M*; Martin, M J*; McEvoy, H C; Rougie, B*; Sadli, M*; Salim, S G R*; Sasajima, N*; Taubert, D R*; Todd, A D W*; Van den Bossche, R; van der Ham, E*; Wang, T*; Whittam, A; Wilthan, B*; Woods, D J*; Woodward, J T*; Yamada, Y*; Yamaguchi, Y*; Yoon, H W*; Yuan, Z* (2016) Thermodynamic temperature assignment to the point of inflection of the melting curve of high temperature fixed points. Philos. Trans. R. Soc. Lond. A, Math. Phys. Eng. Sci., 374 (2064). 20150044

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Abstract

The thermodynamic temperature of the point of inflection of the melting transition of Re-C, Pt-C and Co-C eutectics has been determined to be 2747.84 K ± 0.35 K, 2011.43 K ± 0.18 K and 1597.39 K ± 0.13 K respectively and the thermodynamic temperature of the freezing transition of Cu has been determined to be 1357.80 K ± 0.08 K, where the ± symbol represents 95% coverage. These results are the best consensus estimates obtained using measurements made using various spectroradiometric primary thermometry techniques by nine different national metrology institutes. The good agreement between the institutes suggests that spectroradiometric thermometry techniques are sufficiently mature (at least in those institutes) to allow the direct realisation of thermodynamic temperature above 1234 K (rather than the use of a temperature scale) and that metal-carbon eutectics can be used as high temperature fixed points for thermodynamic temperature dissemination. The results directly support the developing mise en pratique for the definition of the kelvin to include direct measurement of thermodynamic temperature.

Item Type:	Article
Keywords:	High Temperature Fixed Points, thermodynamic temperature, thermometry, temperature scale, kelvin, eutectics
Subjects:	Optical Radiation and Photonics Optical Radiation and Photonics > Radiometry and Detectors
Identification number/DOI:	10.1098/rsta.2015.0044
Last Modified:	02 Feb 2018 13:13
URI:	https://eprintspublications.npl.co.uk/id/eprint/7051