NDLI: The α–β Transition of Nitrogen

Content Provider	Springer Nature Link
Author	Lipiński, L. Kowal, A. Szmyrka Grzebyk, A. Manuszkiewicz, H. Steur, P. P. M. Pavese, F.
Copyright Year	2007
Abstract	It is well-known that, aside from its triple point, nitrogen exhibits a solid-to-solid transition at about 35 K that is of some interest as a secondary reference temperature. During the recently published highly accurate measurements of the triple point of nitrogen (Metrologia 43, 435 (2006)), an extensive study was made also of the solid α–β transition of nitrogen, using both the continuous heating method and the pulse-heating method. This transition is of significantly lower quality than the triple point of nitrogen. A very high thermal resistance and a large time constant characterize the transition. Therefore, even the determination of the self-heating of the thermometer requires a very long time. A value of T $_{90}$ = 35.620 K with an expanded uncertainty U = 8 mK for the coverage factor k = 2 was found, differing by +6 mK from the published CCT-recommended value. The reproducibility of the value was better than ± 5 mK. In addition to the temperature value found for the transition, a comparison is made with previous measurements on this point, and an overview is given of the available information about it.
Starting Page	1904
Ending Page	1912
Page Count	9
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	28
Issue Number	6
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2007-10-02
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	α–β Transition Nitrogen Solid thermometry Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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