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Influence of a trace impurity on tin fixed point plateaus.

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.

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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)
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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