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Martin-Luther-University
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4,
D-06120 Halle, Germany
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K.Fujii, A.Waseda, N.Kuramoto, S.Mizushima, P.Becker, H.Bettin, A.Nicolaus, U.Kuetgens, S.Valkiers, P.Taylor, G.Mana, E.Massa, R.Matyi, E.Kessler, M.Hanke
Present status of the Avogadro constant determination from silicon crystals with natural isotopic composition
IEEE Trans. Instrum. Meas. 84 (2005), 854
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, it leads to a value of the Avogadro constant of 6.022 1353 (18) x 10E23 (1/mol) with a relative combined standard uncertainty of 3.1 x 10E-7
Keywords: Avogadro constant; mass standard
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