Abstract
The lattice parameter of silicon plays an important role in the determination of the Avogadro constant and the fine-structure constant. Today, three values of the d220 silicon lattice spacing are available, measured at the Physikalisch-Technische Bundesanstalt (PTB, Germany), the Istituto di Metrologia "G. Colonnetti" (IMGC, Italy) and the National Research Laboratory of Metrology (NRLM, Japan) and based on the metre scale. Using the PTB lattice spacing comparator, the spacings of the different materials were measured and compared with one another in order to check the possibility of combining the results to form a common "best" value. The characterization of the relevant impurities and crystal defects and their number densities are discussed and corrections applied for their influences on the interatomic distances. The NRLM data are in disagreement with those of the PTB and the IMGC, from which a lattice parameter for a hypothetical, ideal, perfect Si crystal was derived with a relative uncertainty of about .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
