Evaluation of the molar volume of silicon crystals for a determination of the Avogadro constant

Author

Fujii, Kenichi ; Waseda, Atsushi ; Kuramoto, Naoki ; Mizushima, Shigeki ; Tanaka, Mitsuru ; Valkiers, Staf ; Taylor, Philip ; Kessel, Rüdiger ; De Bièvre, Paul

Author_Institution

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

Volume

52

Issue

2

fYear

2003

fDate

4/1/2003 12:00:00 AM

Firstpage

646

Lastpage

651

Abstract

For a determination of the Avogadro constant by the X-ray crystal density method, the molar volume of three different silicon crystals has been evaluated by absolute measurements of their densities and molar masses. The results have shown that the molar volume is 12.058 8279 (22) cm³ mol^-1. When this value is combined with the lattice constant recommended by the CODATA Task Group on Fundamental Constants in 1998, it leads to the Avogadro constant of 6.022 1375 (12)×10²³ mol^-1. Details on the sample preparation and the result of the measurement are presented.

Keywords

X-ray crystallography; density measurement; lattice constants; measurement standards; Avogadro constant; CODATA Task Group; Si; X-ray crystal density method; absolute measurements; densities; lattice constant; molar masses; molar volume; Atom optics; Atomic measurements; Conducting materials; Crystals; Density measurement; Lattices; Metrology; Optical interferometry; Silicon; Volume measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2003.810018

Filename

1202115