Article1997

International intercomparison of silicon density standards

H. Bettin · M. Gläser · Frank Spieweck · H. Toth · Attilio Sacconi · A. Peuto +3 more

27 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Advanced Measurement and Metrology Techniques Advanced Electrical Measurement Techniques

Abstract

In order to obtain a more accurate value for the Avogadro constant N/sub A/ the reliability of density values obtained by different measuring techniques for silicon single crystals was checked by density determinations with four silicon spheres at PTB, IMGC, and NRLM. The diameters of the spheres (two of PTB and two of NRLM) ranged from 90 mm to 94 mm. All the mass measurements (at PTB, IMGC, and NRLM) were carried out in air. At IMGC and NRLM the volume was determined by interferometric measurements, whereas at PTB the volume was obtained from hydrostatic weighings using two Zerodur volume standards. In addition, at PTB the densities of the four spheres were cross-checked by flotation measurements. The maximum relative density difference was found to be 1/spl times/10/sup -6/, whereas the typical values were 2/spl times/10/sup -7/.

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References

1992Equation for the Determination of the Density of Moist Air (1981/91)1995A new determination of N/sub A/1995Absolute measurement of the density of silicon crystals in vacuo for a determination of the Avogadro constant 1992Determination of differences in the density of silicon single crystals by observing their flotation at different pressures 1989Toward the Avogadro constant-preliminary results on the molar volume of silicon

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2004Density comparisons of silicon samples by the pressure-of-flotation method at PTB 1997The molar volume of silicon [Avogadro constant]1996The molar volume of silicon 1999The molar volume of silicon: discrepancies and limitations

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