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Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points

AuthorsWoolliams, E. R.; Anhalt, K.; Ballico, M.; Bloembergen, P.; Bourson, F.; Briaudeau, S.; Campos Acosta, Joaquín ; Cox, M. G.; Campo, D. del; Dong, W.; Dury, M. R.; Gavrilov, V.; Grigoryeva, I.; Hernanz, María Luisa ; Yoon, H. W.; Yuan, Z.
KeywordsTemperature scale
High-temperature fixed points
Thermodynamic temperature
Issue Date22-Feb-2016
PublisherRoyal Society (Great Britain)
CitationPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374 (2016)
AbstractThe 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 ± 0.35 K, 2011.43 ± 0.18 K and 1597.39 ± 0.13 K, respectively, and the thermodynamic temperature of the freezing transition of Cu has been determined to be 1357.80 ± 0.08 K, where the ± symbol represents 95% coverage. These results are the best consensus estimates obtained from 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 realization 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. © 2016 The Author(s)
DescriptionE. R. Woolliams et al. ; 23 págs.; 5 figs. 4 tabs.
Publisher version (URL)https://doi.org/10.1098/rsta.2015.0044
Identifiersdoi: 10.1098/rsta.2015.0044
issn: 1364-503X
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