Triple-Point Temperatures of 20Ne and 22Ne

Hill, Kathryn; Fahr, Martin

doi:10.1007/s10765-011-0939-5

Cited by 15 publications

(29 citation statements)

References 14 publications

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“…At NRC, measurements have been finalized [10] on two cells filled with material from two batches of 20 Ne and one cell filled with 22 Ne: 22 Ne is originating from a batch different than the INRIM one; for one 20 Ne batch, a suspicion exists that the batch, sold by different companies, is from the same origin as the INRIM one, since it has the same analysis certificate as an INRIM one (not measured yet).…”

Section: Analytical Assay For Isotopic Compositionmentioning

confidence: 99%

“…At NRC, studies have been performed on two issues concerning isotopic mixtures [10]. For "natural" neon and for the cell models considered (condensed sample of a vertical cylindrical form with thickness >≈1 mm, examples of melting behavior in Fig.…”

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

“…At both NIST and NRC [10], calculations have been performed on the ideal-solution phase boundaries based on the known pure isotope triple-point temperatures, T ( 20 Ne) and T ( 22 Ne) and their respective enthalpies of fusion (see Fig. 5).…”

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

“…At INRIM, only cell model (c) was presently used for pure isotopes [8], where the inner copper body is made of many wires, 0.8 mm in diameter, closely packed and [10] is assumed to be equivalent to the IUPAC value. The origin for T corresponds to pure 20 Ne and is assumed to be equivalent for both data sets (courtesy of W. Tew) leaving an undisturbed vertical cylindrical 1 mm thick space between the packed wires and the wall of the cell.…”

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

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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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Section: Analytical Assay For Isotopic Compositionmentioning

confidence: 99%

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

Section: Calculations Based On Theoretical Considerations and Other Cmentioning

confidence: 99%

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

et al. 2010

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“…To clarify the isotopic dependence of the triple point temperature of Ne, Pavese et al [29,30] and Hill and Fahr [31] recently studied the difference of the triple point temperatures of 20 Ne and 22 Ne using high-purity single isotopes, precisely. The differences reported by both groups agree well within their uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the triple-point temperatures of [sup 20]Ne, [sup 22]Ne and normal Ne

Nakano¹,

Tamura²,

Nagao³

2013

AIP Conference Proceedings

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At the National Metrology Institute of Japan (NMIJ), the triple points of 20 Ne and 22 Ne were realized using modular sealed cells, Ec3Ne20 and Ec8Ne22, made by the Istituto Nazionale di Ricerca Metrologica (INRiM) in Italy. The difference of the triple-point temperatures of 20 Ne and 22 Ne was estimated by using the sub-range of standard platinum resistance thermometers (SPRTs) calibrated by NMIJ on the International Temperature Scale of 1990 (ITS-90). The melting curves obtained with the Ec3Ne20 and Ec8Ne22 cells show narrow widths (0.1 mK) over a wide range of the inverse of the melted fraction (1/F) from 1/F=1 to 1/F =10. The liquidus point T tp estimated by the melting curves from F~0.5 to F~0.85 using the Ec8Ne22 is 0.146 29 (4) K higher than that using the Ec3Ne20 cell, which is in good agreement with that observed by INRiM using the same cells. After correction of the effect of impurities and other isotopes for Ec3Ne20 and Ec8Ne22 cells, the difference of T tp between pure 20 Ne and pure 22 Ne is estimated to be 0.146 61 (4) K, which is consistent with the recent results reported elsewhere. The sub-ranges of SPRTs computed by using the triple point of 20 Ne or 22 Ne realized by the Ec3Ne20 cell or the Ec8Ne22 cell in place of the triple point of Ne for the defining fixed point of the ITS-90 are in good agreement with those realized on the basis of the ITS-90 at NMIJ within 0.03 mK, which is much smaller than the non-uniqueness and the sub-range inconsistency of SPRTs.

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Comparison at NMIJ/AIST of the Triple Point of Neon Using Different Sealed Cells

2011

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At the National Metrology Institute of Japan (NMIJ), the triple point of neon was measured using an NMIJ sealed cell, NMIJ Ne-5, and a modular sealedcell model, Ec2Ne, made by the Istituto Nazionale di Ricerca Metrologica (INRiM) in Italy, and the results were compared. The melting curves obtained with the NMIJ Ne-5 cell show narrow widths (0.1 mK) over a wide range of the inverse of the melted fraction (1/F) from 1/F = 1 to 1/F = 10, which is consistent with a previous report. On the other hand, the width of the melting curves obtained with the Ec2Ne cell is 0.15 mK from 1/F = 1 to 1/F = 10. The liquidus point T tp estimated by the melting curves from F ∼ 0.35 to F ∼ 0.85 using the NMIJ cell is 0.05 mK higher than that using the Ec2Ne cell. The difference does not agree with the results obtained in an assay of the isotopic concentration from samples of the original Ne sources. The origin of the discrepancy has not been clarified yet.

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Triple-Point Temperatures of 20Ne and 22Ne

Cited by 15 publications

References 14 publications

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

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

Comparison of the triple-point temperatures of [sup 20]Ne, [sup 22]Ne and normal Ne

Comparison at NMIJ/AIST of the Triple Point of Neon Using Different Sealed Cells

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