High-Purity Fixed Points of the ITS-90 with Traceable Analysis of Impurity Contents

The International Temperature Scale of 1990 (ITS-90) is based on thermodynamic equilibrium states of ideally pure substances. The largest contribution to the uncertainty budgets of most metallic fixed points is the influence of impurities on the fixed-point temperature. Therefore, a traceable chemic...

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Bibliographic Details
Published inInternational journal of thermophysics Vol. 29; no. 1; pp. 139 - 150
Main Authors Rudtsch, S., Fahr, M., Fischer, J., Gusarova, T., Kipphardt, H., Matschat, R.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.02.2008
Subjects
Classical Mechanics
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Physical Chemistry
Physics
Physics and Astronomy
Fixed points
Phase diagrams
Chemical analysis
ITS-90
Impurities
Thermal effects
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Summary:The International Temperature Scale of 1990 (ITS-90) is based on thermodynamic equilibrium states of ideally pure substances. The largest contribution to the uncertainty budgets of most metallic fixed points is the influence of impurities on the fixed-point temperature. Therefore, a traceable chemical analysis of the remaining impurities with small uncertainty is the basis of further progress. Further requirements are better knowledge of the phase diagrams at very low impurity contents, impurity segregation, and the quantification and correction of thermal effects during a fixed-point realization. In this article, current and future activities at PTB and BAM in order to develop improved metallic fixed-point cells of the ITS-90 are reviewed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-007-0358-9