| Zugriffsnummer | 15551 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Special problems when realising the triple point of hydrogen als a defining fixed point of the ITS-90 |
| Autor(in); Institution |
Fellmuth, Bernd; 7.32, Tieftemperaturmetrologie, PTB-Berlin
Head, D.; National Physical Laboratory (NPL), Teddington, UK
Pavese, F.; Istituto di Metrologia Gustavo Colonnetti (IMGC), Torino, ITALY
Szmyrka-Grzebyk, A.; Instytut Niskich Temperatur i Badan Strukturalnych, Polska Akademia Nauk, Wroclaw, POLAND
Tew, W. L.; National Institute of Standards and Technology, Gaithersburg, USA
|
| Quelle/Jahr | TEMPMEKO 2001, 8th International Symposium on Temperature and Thermal Measurements in Industry and Science: Proceedings: 1 (2002), 403 - 410 |
| Herausgeber(in) |
Fellmuth, Bernd; 7.32, Tieftemperaturmetrologie, PTB-Berlin
Seidel, Joachim; 7.2, Hochtemperaturphysik und Vakuum, PTB-Berlin
Scholz, Günter; 3.23, Analytische Messtechnik und Feuchte, PTB-Braunschweig
|
| ISBN | 3-8007-2676-9 |
| Verlag | Berlin [u.a.]: VDE-Verl. |
| Konferenzangaben | TEMPMEKO 2001 ; 8th International Symposium on Temperatur and Thermal Measurement in Industry and Science, Berlin, 19-21, June, 2001, Germany |
| Zusammenfassung | The two special problems, which appear when realising the triple point of hydrogen als a temperature fixed point due to the influences of the deuterium content and the catalyst, have been invstigated by filling a large number of sealed triple-point cells. The cells differ with respect to the deuterium content (29 μmol D/mol H to 155 μmol D/mol H), type of catalyst (hydrous ferric oxide and gadolinium oxide), catalyst-tolequid volume ratio (a few per cent to more than 100 per cent) and cell design. At higher catalyst-to-liquid volume ratios, the shape of the melting curve depends on the type of the datalyst, but only the melding temperature of that sample part being in direct contact wiht the catalyst and thus distorted is changed. For the slope of the dependence of the triple-point temperature on the deuterium content, a preliminary value of (5.2 ± 0.4) μK per μmol D/ mol H has been found. |
Zitierung
Fellmuth, B., Head, D., Pavese, F., Szmyrka-Grzebyk, A., & Tew, W. L. (2002). Special problems when realising the triple point of hydrogen als a defining fixed point of the ITS-90. TEMPMEKO 2001 ; 8th International Symposium on Temperatur and Thermal Measurement in Industry and Science, Berlin, 19-21, June, 2001, Germany.