Petchpong, P*; Head, D I; Au, J Y H* (2008) Influence of a trace impurity on tin fixed point plateaus. In: SICE 2008, 20-22 Aug 2008, Japan.
Full text not available from this repository.Abstract
The effect of trace cobalt impurity on the realisation of a high purity (99.9999%) tin fixed-point is presented. The aim is to improve the measurement of the temperature shift caused by low level impurity dopants, to test the interpolation of previous binary alloy systems [1] obtained using relatively high levels of impurities. The experiments and results, described below, revealed the shift of the melting and freezing curves of an initially 'pure' tin cell by -0.71 mK/ppmw of cobalt, and confirmed the reproducibility of the temperature measurements in this fixed-point cell.
Item Type: | Conference or Workshop Item (UNSPECIFIED) |
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Keywords: | Tin Fixed point, ITS-90, impurity, temperature, thermometry |
Subjects: | Engineering Measurements Engineering Measurements > Thermal |
Last Modified: | 02 Feb 2018 13:15 |
URI: | http://eprintspublications.npl.co.uk/id/eprint/4262 |
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