The molar volume of silicon [Avogadro constant]

• Published in: IEEE transactions on instrumentation and measurement Vol. 46; no. 2; pp. 592 - 595
• Main Authors: De Bievre, P., Valkiers, S., Gonfiantini, R., Taylor, P.D.P., Bettin, H., Spieweck, F., Peuto, A., Pettorruso, S., Mosca, M., Fujii, K., Tanaka, M., Nezu, Y., Leistner, A.J., Giardini, W.J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.04.1997; Institute of Electrical and Electronics Engineers
• Subjects: Atomic measurements; Australia; Crystalline materials; Crystals; Density measurement; Determination of fundamental constants; Exact sciences and technology; Laboratories; Lattices; Manufacturing; Measurements common to several branches of physics and astronomy; Metrology; Metrology, measurements and laboratory procedures; Physics; Silicon; Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements); Spatial dimensions (eg, position, lengths, volume, angles, displacements, including nanometer-scale displacements); Volume measurement; Monocrystals; Avogadro number; Density measurement; Molar volume; Measuring methods; Silicon; Fundamental constants; Experimental study
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/19.571927

A reevaluation has been made of the density and molar mass data for the silicon single crystals used in three Avogadro projects in which the authors' institutions are cooperating. A value of 12.058 825(15) cm/sup 3/ mol/sup -1/ at 22.5/spl deg/C was obtained for the ratio M(Si)//spl rho/(Si), which is considered our present best estimate of the silicon molar volume. This implies for the Avogadro constant a value of 6.022 137 8(75)/spl times/10/sup 23/ mol/sup -1/, with a relative difference of (2/spl plusmn/12)/spl times/10/sup -7/ with respect to the value published by Seyfried et al. (1992).