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

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DOIResolve DOI: http://doi.org/10.1098/rsta.2015.0044
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TypeArticle
Journal titlePhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
ISSN1364-503X
1471-2962
Volume374
Issue2064
Article number20150044
SubjectHigh-temperature fixed points; Thermodynamic temperature; Thermometry; Temperature scale; Kelvin; Eutectics
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.
Publication date
PublisherThe Royal Society
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number23000081
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Record identifier73d31b55-8679-4ea9-b679-4fc585e8b76e
Record created2016-06-02
Record modified2016-06-02
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