Progress Towards the Determination of the Relationship of Triple-Point Temperature versus Isotopic Composition of Neon

Pavese, Franco; Fellmuth, B.; Hill, Kathryn; Head, D I; Hermier, Y.; Lipiński, L.; Nakano, Tohru; Peruzzi, Andrea; Sakuraï, H.; Szmyrka-Grzebyk, A.; Steele, A G; Steur, P. P. M.; Tamura, Osamu; Tew, Weston L.; Valkiers, S.; Wolber, L.

doi:10.1007/s10765-007-0329-1

Cited by 25 publications

(85 citation statements)

References 17 publications

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“…For instance, the sample-to-sample variability of the 22 Ne isotope amount fraction was~1.8% of the nominal value x( 22 Ne) = 95%, corresponding to a variation in the triple point of about 0.3 mK [15].…”

Section: Triple Pointsmentioning

confidence: 98%

Cryocrystal phase transitions applied as temperature standards

Szmyrka-Grzebyk

Kowal

2009

Low Temperature Physics

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International temperature scales define several fixed points, which temperature values are determined with a very high precision. Some of them, which are in a low-temperature range, are called gaseous fixed points because the reference substances under a normal condition -in a room-temperature range -appear in a gaseous state. These reference substances are called by physicists cryocrystals or quantum crystals when occurring in a low temperature in a solid state. The substances play an important role in a standard thermometry. The triple point of argon, oxygen, neon and hydrogen are primary fixed points of the International Temperature Scale of 1990 (ITS-90) [1]. The triple points of nitrogen, methane and carbon dioxide are secondary fixed points of the scale [2]. Also, the solid-solid phase transitions in the cryocrystals are secondary fixed points of the scale. The highest accuracy methods of measurements applied in a standard thermometry enable the determination with a very small uncertainty of the phase transition temperatures, its reproducibility and stability. The reproducibility and stability of the transition temperature are the most important factors deciding about usefulness of these points in thermometry. Using the highest accuracy methods, better than 1 mK, which at present are used in metrology only can give a new information about nature and properties of investigated substances important also for physicists. PACS: 64.60.Ej Studies/theory of phase transitions of specific substances; 64.75.-g Phase equilibria; 67.90.+z Other topics in quantum fluids and solids.

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Section: Triple Pointsmentioning

confidence: 98%

Cryocrystal phase transitions applied as temperature standards

Szmyrka-Grzebyk

Kowal

2009

Low Temperature Physics

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“…A full treatment of the TPIE in neon is being presented in another paper in this symposium with new experimental data [36]. A three-isotope plot for Ne similar to Figs.…”

Section: Neonmentioning

confidence: 98%

“…A similar analysis can be done for the Ar isotopes, but in this case a point on the three-isotope plot of 36 Ar/ 40 Ar versus 38 Ar/ 40 Ar uniquely specifies the composition. Unlike the other noble gases, Ar is nearly mono-isotopic with x 40Ar = 99.6%.…”

Section: Argonmentioning

confidence: 99%

Estimating the Triple-Point Isotope Effect and the Corresponding Uncertainties for Cryogenic Fixed Points

Tew

2008

Int J Thermophys

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The sensitivities of melting temperatures to isotopic variations in monatomic and diatomic atmospheric gases using both theoretical and semi-empirical methods are estimated. The current state of knowledge of the vapor-pressure isotope effects (VPIE) and triple-point isotope effects (TPIE) is briefly summarized for the noble gases (except He), and for selected diatomic molecules including oxygen. An approximate expression is derived to estimate the relative shift in the melting temperature with isotopic substitution. In general, the magnitude of the effects diminishes with increasing molecular mass and increasing temperature. Knowledge of the VPIE, molar volumes, and heat of fusion are sufficient to estimate the temperature shift or isotopic sensitivity coefficient via the derived expression. The usefulness of this approach is demonstrated in the estimation of isotopic sensitivities and uncertainties for triple points of xenon and molecular oxygen for which few documented estimates were previously available. The calculated sensitivities from this study are considerably higher than previous estimates for Xe, and lower than other estimates in the case of oxygen. In both these cases, the predicted sensitivities are small and the resulting variations in triple point temperatures due to mass fractionation effects are less than 20 µK.

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“…(a) The most accurate thermal results on "natural" neon then available, those performed at PTB, resulted in a value of the slope for the T tp versus x( 22 Ne) (indicated as 22 x in the following) relationship that significantly deviates from the value obtained from a linear interpolation of the T tp values for the pure 20 Ne and 22 Ne isotopes, as found in the (old) literature (see in [4]). No other dataset which existed at that time could have resolved this issue.…”

Section: Introductionmentioning

confidence: 95%

“…Following two publications in 2005 and 2008 [1,2], a considerable amount of new activities have been developed.…”

Section: Introductionmentioning

confidence: 99%

Further Progress Toward the Determination of T tp−x(22Ne)

et al. 2010

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Following the start of exploration of the problem of the effect of neon isotopes on the triple-point temperature in 2005, further progress was achieved in 2006-2008, and published in 2008. This paper summarizes the advances to date in our understanding as obtained from further work done in 2008-2009 on five basic aspects of the problem: new isotopic assays; new thermal measurements on neon of "natural" composition; the feasibility of obtaining a value of the slope dT tp /dx( 22 Ne) with an accuracy sufficient for the purpose; the possible occurrence of isotopic fractionation during the process of sealing the samples in the cells; and new thermal measurements

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Progress Towards the Determination of the Relationship of Triple-Point Temperature versus Isotopic Composition of Neon

Cited by 25 publications

References 17 publications

Cryocrystal phase transitions applied as temperature standards

Cryocrystal phase transitions applied as temperature standards

Estimating the Triple-Point Isotope Effect and the Corresponding Uncertainties for Cryogenic Fixed Points

Further Progress Toward the Determination of T tp−x(22Ne)

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