Title :
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
fDate :
4/1/2005 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2004.843101
