Toward the Avogadro constant-preliminary results on the molar volume of silicon

Author

Sacconi, Attilio ; Peuto, Anna M. ; Pasin, Walter ; Panciera, Renzo ; Lenaers, Guido ; Valkiers, Staf ; van den Berg, Max ; De Bievre, P.

Author_Institution

Inst. di Metrol., Torino, Italy

Volume

38

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

200

Lastpage

205

Abstract

The silicon molar volume has been measured through atomic weight and density measurements. Mass spectrometric determination of the isotopic composition was performed on two differently grown samples by comparison with the US National Bureau of Standards (NBS) reference material SRM 990. The density of specimens from the same crystals was obtained through direct mass and dimension measurements on one single-crystal sphere and through hydrostatic comparison for another sphere. Compatibility with previous measurements was checked through hydrostatic comparison with IMGC Zerodur density standards. The two molar volume determinations differ by 0.14 p.p.m. The preliminary value obtained is 12.058, 843±0.000, 029 cm³/mol at 22.5°C and in vacuo

Keywords

atomic mass; constants; density measurement; elemental semiconductors; silicon; volume measurement; Avogadro constant; IMGC Zerodur density standards; Si; US National Bureau of Standards; atomic weight; density measurements; dimension measurements; hydrostatic comparison; isotopic composition; mass measurement; molar volume; reference material; Atomic measurements; Composite materials; Crystalline materials; Crystals; Density measurement; Mass spectroscopy; NIST; Silicon; Volume measurement; Weight measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.192272

Filename

192272