NDLI: The Influence of Impurities on the Zinc Fixed Point

Content Provider	Springer Nature Link
Author	Rudtsch, Steffen Aulich, Antje
Copyright Year	2016
Abstract	Impurities are considered to be the most significant source of uncertainty for the realization of the International Temperature Scale of 1990 by means of metal fixed points. The determination and further reduction in this uncertainty require a traceable chemical analysis of dissolved impurities in the fixed-point metal and accurate knowledge of the specific temperature change caused by impurities (slope of the liquidus line). We determined the slope of the liquidus line for three binary systems and present results and conclusions from the chemical analysis of zinc with a nominal purity of 7N. For the Fe–Zn system, we determined a liquidus slope of ( $$-0.91\pm 0.14$$ ) mK / ( $$μ \hbox {g}{\cdot }\hbox { g}^{-1}$$ ) from the evaluation of freezing plateaus and ( $$-0.76~\pm 0.20$$ ) mK / ( $$μ \hbox {g}{\cdot }\hbox { g}^{-1}$$ ) from the evaluation of melting plateaus; for the Pb–Zn system, the corresponding results are ( $$-0.27~\pm 0.05$$ ) mK / ( $$μ \hbox {g}{\cdot }\hbox { g}^{-1}$$ ) and ( $$-0.26~\pm 0.05$$ ) mK / ( $$μ \hbox {g}{\cdot }\hbox { g}^{-1}$$ ). Although for the Sb–Zn system, we determined a liquidus slope of about $$-0.8$$ mK / ( $$μ \hbox {g}{\cdot }\hbox { g}^{-1}$$ ), our investigations showed that a correction of the influence of antimony is highly questionable because antimony can be found in zinc in a fully dissolved state or precipitated as an insoluble compound. Iron is the only impurity where a correction of the fixed-point temperature was possible. For the realization of the zinc fixed point at PTB, this correction is between 2 $$μ $$ K and 16 $$μ $$ K depending on the batch of zinc used. The influence of the sum of all impurities was estimated by means of the OME method. The resulting uncertainty contribution is between 12 $${μ }\hbox {K}$$ and 48 $${μ }\hbox {K}$$ .
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	38
Issue Number	2
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2016-12-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Impurities ITS-90 Zinc fixed point Condensed Matter Physics Classical Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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