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

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...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2005-04, Vol.54 (2), p.854-859
Main Authors: Fujii, K., Waseda, A., Kuramoto, N., Mizushima, S., Becker, P., Bettin, H., Nicolaus, A., Kuetgens, U., Valkiers, S., Taylor, P., Paul De Bievre, Mana, G., Massa, E., Matyi, R., Kessler, E.G., Hanke, M.
Format: Article
Language:English
Subjects:
Avogadro constant
Covariance matrix
Crystal lattices
Crystals
Density
Density measurement
fundamental physical constant
Instrumentation
Isotopes
lattice constant
Lattices
Least squares approximation
Metrology
molar mass
molar volume
NIST
Silicon
silicon crystal
Uncertainty
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Summary: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)/spl times/10/sup 23/ mol/sup -1/ with a relative combined standard uncertainty of 3.1/spl times/10/sup -7/.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2004.843101