Comparison of silicon density standards at NRLM and IMGC

Author

Peuto, Anna M. ; Sacconi, Attilio ; Mosca, Mario ; Fujii, Ken-ichi ; Tanaka, Mitsuru ; Nezu, Yoshiaki

Author_Institution

Istituto di Metrol. ´´C Colonnetti´´, Torino, Italy

Volume

42

Issue

2

fYear

1993

fDate

4/1/1993 12:00:00 AM

Firstpage

242

Lastpage

246

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

Keywords

constants; density measurement; diameter measurement; measurement standards; silicon; Avogadro constant; IMGC; Italy; Japan; NRLM; National Research Laboratory; Si; Torino; density standards; diameter measurements; hydrostatic comparison; single-crystal; spheres; Crystals; Density measurement; Impurities; Laboratories; Measurement standards; Metrology; Silicon; Stability; Standards development; Volume measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.278557

Filename

278557