Present State of the avogadro constant determination from silicon Crystals with natural isotopic compositions

Author

Fujii, Kenichi ; Waseda, Atsushi ; Kuramoto, Naoki ; Mizushima, Shigeki ; Becker, Peter ; Bettin, Horst ; Nicolaus, Arnold ; Kuetgens, Ulrich ; Valkiers, Staf ; Taylor, Philip ; Bièvre, Paul De ; Mana, Giovanni ; Massa, Enrico ; Matyi, Richard ; Kessler,

Author_Institution

Nat. Metrol. Inst. of Japan, Ibaraki, Japan

Volume

54

Issue

2

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

854

Lastpage

859

Abstract

A determination of the Avogadro constant from two selected silicon single-crystals with natural isotopic compositions is described. The density, molar mass, and lattice spacing of the two crystals were measured at NMIJ, PTB, IRMM, IMGC, and NIST. When all the data are combined, they lead to a value of the Avogadro constant of 6.022 1353 (18)×10²³ mol^-1 with a relative combined standard uncertainty of 3.1×10^-7.

Keywords

constants; crystals; density; elemental semiconductors; lattice constants; measurement standards; silicon; Avogadro constant determination; IMGC; IRMM; NIST; PTB; density; fundamental physical constant; lattice constant; molar mass; molar volume; natural isotopic compositions; silicon crystals; standard uncertainty; Covariance matrix; Crystals; Density measurement; Helium; Isotopes; Lattices; Least squares approximation; Metrology; NIST; Silicon; Avogadro constant; density; fundamental physical constant; lattice constant; molar mass; molar volume; silicon crystal;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2004.843101

Filename

1408305