Article1993

Comparison of silicon density standards at NRLM and IMGC

A. Peuto · Attilio Sacconi · Kenichi Fujii · Mitsuru Tanaka · Y. Nezu

16 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

The Istituto di Metrologia 'G Colonnetti' in Torino, Italy, (IMGC) and the National Research Laboratory of Metrology in Japan (NRLM) have developed density standards in the form of single-crystal silicon spheres within their projects for the determination of the Avogadro constant. The results of the first comparison on two such artifacts are presented. The mass and volume of the IMGC sphere were measured at NRLM with an absolute method, whereas , at IMGC, the density of the NRLM sphere was measured by hydrostatic comparison to the IMGC silicon standard. Additional diameter measurements were also made. The overall results show excellent agreement: within 0.16 ppm in density, 0.1 ppm in mass, 0.06 ppm in volume, and 0.04 ppm in diameter measurements.>

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References

1974Determination of the Avogadro Constant 1988The results of a comparison between calculated and measured values of the refractive index of air 1987Polishing a 1-kg silicon sphere for a density standard 1974Geometrical considerations in the measurement of the volume of an approximate sphere 1989Toward the Avogadro constant-preliminary results on the molar volume of silicon 1991Volume and density measurements for the IMGC Avogadro experiment

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1994Density of Silicon Crystals 1994The Role ofNAin the SI: An Atomic Path to the Kilogram 2000Bilateral comparisons of hydrometer calibrations between the IMGC-LNE and the IMGC-MIKES

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