New thermodynamic temperature references up to 3020 K

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F21%3AN0000059" target="_blank" >RIV/00177016:_____/21:N0000059 - isvavai.cz</a>

Result on the web

<a href="https://www.researchgate.net/publication/356536616_New_thermodynamic_temperature_references_up_to_3020_K_Nouvelles_references_de_temperature_thermodynamique_jusqu'a_3020_K" target="_blank" >https://www.researchgate.net/publication/356536616_New_thermodynamic_temperature_references_up_to_3020_K_Nouvelles_references_de_temperature_thermodynamique_jusqu'a_3020_K</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

New thermodynamic temperature references up to 3020 K

Original language description

The mise-en-pratique of the new definition of the kelvin includes the possibility of using high-temperature fixed points (HTFPs) with assigned thermodynamic temperatures as references for the realisation and the dissemination of the kelvin. In a first step, three HTFPs, Co-C (1597 K), Pt-C (2011 K) and Re-C (2747 K), have been studied extensively over the last decade and thermodynamic temperatures were assigned in the frame of a former European-metrology funded project (joint research project "implementing the new kelvin" 2012-2015). To complete this work, a new European project, Real-K "realising the new kelvin", was launched in September 2019. Among the objectives of this project, gathered in its first work package, the study of four additional high-temperature fixed points, Fe-C (1426 K), Pd-C (1765 K), Ru-C (2226 K) and WC-C (3020 K), is ongoing. The consortium of this work package was extended over the European region and strengthened by four contributing national metrology institutes (NMIs) from the Federation of Russia (VNIIFI), China (NIM), Japan (NMIJ) and Canada (NRC); all bringing a long experience in high-temperature fixed point research and thermodynamic temperature measurement. The goal of this work package is twofold: extending the thermodynamic temperature references range (1426 K to 3020 K) and testing the traceability via HTFPs. To achieve this goal, several steps are needed, as follows:-Construction of new HTFP cells with the best-known technologies.-Characterisation of the HTFP cells and the thermal effects.-Comparison and selection of the cells.-Assignment of thermodynamic temperatures to a primary set of cells.-Dissemination trials with a secondary set of cells (with adapted dimensions if needed). In this presentation, the results obtained in the first half of the project will be detailed. In particular, the construction, the characterisation of the thermal effects and the initial comparison of the cells will be reviewed. From the first results an estimate of the possibilities of the fabricated cells, in terms of uncertainties in the realisation of thermodynamic temperature, will be performed.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/8B19006" target="_blank" >8B19006: Realising the redefined kelvin</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů