Dependence of the triple point temperature of neon on isotopic composition and its implications for the ITS-90

Pavese, Franco; Steur, P. P. M.; Hermier, Y.; Hill, Kathryn; Kim, J. S.; Lipiński, L.; Nagao, Keisuke; Nakano, Tohru; Peruzzi, Andrea; Sparasci, F.; Szmyrka-Grzebyk, A.; Tamura, Osamu; Tew, Weston L.; Valkiers, S.; Geel, Jan Van

doi:10.1063/1.4821378

Cited by 10 publications

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“…In Table 2 the data are reported for the outcomes of several comparisons concerning neon, and in Table 3 the results for the CCT-K2.x of having taken into account the isotopic effect, based on the assay values selected after the critical evaluation of the assays, and their associated uncertainties [13,15]. 1 In Table 5 the results of the isotopic corrections for the Star Inter-comparison are reported [12].…”

Section: Aim Of This Papermentioning

confidence: 99%

“…These studies and the subsequent ones on pure 20 Ne and 22 Ne samples [13] led to the equation, now included in [31], relating T 90,ref (ITS-90 defined value) to the value T 90 for the isotopic composition of the sample used, and allow to compute, from the measured resistance-ratio value, the corresponding value at T 90,ref [35].…”

Section: Aim Of This Papermentioning

confidence: 99%

“…For neon it is possible to assign the isotopic composition to the gas samples used in a few open-cell realisations or contained, in most cases, in permanentlysealed cryogenic metal cells [13]. In these cases, it is possible to apply the equations in the ITS-90 Technical Annex [31] and compute the results at the reference composition.…”

Section: Aim Of This Papermentioning

confidence: 99%

“…During a worldwide study lasted about 10 years, 26 different bottles of high-purity neon of commercial origin obtained from distillation of air, plus three certified reference mixtures, were studied, including isotopic composition and chemical impurities assays; thermal studies were performed on 34 samples drawn from them [13]. These studies and the subsequent ones on pure 20 Ne and 22 Ne samples [13] led to the equation, now included in [31], relating T 90,ref (ITS-90 defined value) to the value T 90 for the isotopic composition of the sample used, and allow to compute, from the measured resistance-ratio value, the corresponding value at T 90,ref [35].…”

Section: Aim Of This Papermentioning

confidence: 99%

“…Isotopic studies were undertaken, initially on e-H 2 (HD in H 2 ) [5,6] and H 2 O (D 2 and 18 O 2 ) [7][8][9][10], and later also on Ne [4,[11][12][13][14][15].…”

Section: State Of the Artmentioning

confidence: 99%

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The ITS-90 after definition of neon isotopic reference composition: extent of the isotopic effect tested on previous inter-comparison results

Pavese¹,

Szmyrka-Grzebyk²,

Steur

2017

Int. J. Metrol. Qual. Eng.

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Abstract. Starting from the end of the past century, the importance has been recognised of the effect of isotopic composition on some of the temperature fixed points for the most accurate realisations of the ITS-90. In the original definition of the latter, dating back to 1990, only a generic reference was made to "natural" composition of the substances used for the realisation of the fixed points, except for helium. The definition of a reference isotopic composition for three fixed points, e-H 2 , Ne and H 2 O, while eliminating the non-uniqueness of the Scale in this respect, induced detectable differences in the present and future realisations of the Scale, at the highest accuracy level, with respect to the previous realisations, when they affected the results of past MRA key comparisons, namely the CCT K1 (and K1.1) and CCT K2 (and K2.1-K2.5) and the related regional and supplementary ones. The paper provides evidence of the extent of this effect by using the results of the relevant key comparisons for neon archived in the BIPM KCDB, and of other comparisons existing in the literature (1979-1984, 2007-2012 and 2009-2010 sealed cell comparisons), and discusses the meaning and the outcomes of this evaluation.

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Section: Aim Of This Papermentioning

confidence: 99%

Section: Aim Of This Papermentioning

confidence: 99%

Section: Aim Of This Papermentioning

confidence: 99%

Section: Aim Of This Papermentioning

confidence: 99%

“…Isotopic studies were undertaken, initially on e-H 2 (HD in H 2 ) [5,6] and H 2 O (D 2 and 18 O 2 ) [7][8][9][10], and later also on Ne [4,[11][12][13][14][15].…”

Section: State Of the Artmentioning

confidence: 99%

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The ITS-90 after definition of neon isotopic reference composition: extent of the isotopic effect tested on previous inter-comparison results

Pavese¹,

Szmyrka-Grzebyk²,

Steur

2017

Int. J. Metrol. Qual. Eng.

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Applying Isotopic Effect in ITS-90 SPRT Calibrations

Pavese

2014

Int J Thermophys

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The International Temperature Scale of 1990 (ITS-90) defines exact values for all fixed-point temperatures. For example, for the standard platinum resistance thermometers (SPRT), at each fixed point, the measured SPRT resistance and the temperature defined in the ITS-90 are used as input data into the correction equations of the ITS-90. Starting from 2006, formal equations were added to the Technical Annex for the ITS-90 for computing the fixed-point temperatures of the substances of different isotopic compositions, presently the e-H 2 triple and vapor-pressure points, Ne triple point, and H 2 O triple point. This paper addresses the issue of the method required to apply the procedure defined in the ITS-90 for the calibration of a SPRT, according to the new requirements. The required procedure does not involve a "correction" of the fixed-point temperatures, since they are defined exactly by the ITS-90, but requires instead, the re-computing of the measured resistances at the relevant fixed points. In those cases where resistance ratios with respect to the triple point of water are required, the re-computation must be first applied separately to the specific fixed points and to the triple point of water. In case the re-computation is not possible because of insufficient information on the isotopic composition of the sample used, an additional component must be added to the total uncertainty budget.

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Effects of Isotopes on the Triple Points of Carbon Dioxide and Sulfur Hexafluoride

Zhang

Feng

2021

Int J Thermophys

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Dependence of the triple point temperature of neon on isotopic composition and its implications for the ITS-90

Cited by 10 publications

References 0 publications

The ITS-90 after definition of neon isotopic reference composition: extent of the isotopic effect tested on previous inter-comparison results

The ITS-90 after definition of neon isotopic reference composition: extent of the isotopic effect tested on previous inter-comparison results

Applying Isotopic Effect in ITS-90 SPRT Calibrations

Effects of Isotopes on the Triple Points of Carbon Dioxide and Sulfur Hexafluoride

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