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dc.contributor.authorBUSCH I.en_GB
dc.contributor.authorVALKIERS STAFen_GB
dc.contributor.authorBECKER P.en_GB
dc.date.accessioned2010-02-25T15:13:27Z-
dc.date.available2008-02-12en_GB
dc.date.available2010-02-25T15:13:27Z-
dc.date.created2008-02-11en_GB
dc.date.issued2007en_GB
dc.date.submitted2008-02-11en_GB
dc.identifier.citationProceedings of 13th International Metrology Congress p. 1-6en_GB
dc.identifier.urihttp://www.cfmetrologie.com/documentation_en.phpen_GB
dc.identifier.urihttp://publications.jrc.ec.europa.eu/repository/handle/JRC41747-
dc.description.abstractAn improved attempt of several national metrology institutes to replace the present definition of the kilogram with the mass of a certain number of 12C atoms is described. This requires the determination of the Avogadro constant, NA, via the silicon route with a relative uncertainty better than 2*10-8. Previously, the limiting factor is the measurement of the average molar mass. Consequently, a world-wide collaboration has been set up, to produce, approximately, 5 kg of 28Si single-crystal with an enrichment factor greater than 99.985 % to be used for an improved determination of NA. The first successful tests of all technological steps (enrichment of SiF4, purification and synthesis of silane, deposition of polycrystalline 28Si, single crystal growth) for the production of high-purity 28Si are reported.en_GB
dc.description.sponsorshipJRC.D.4-Isotope measurementsen_GB
dc.format.mediumCD-ROMen_GB
dc.languageENGen_GB
dc.publisherCollège Français de Métrologieen_GB
dc.relation.ispartofseriesJRC41747en_GB
dc.titleDetermination of the Avogadro Constant, a Contribution to the New Definition of Massen_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Health, Consumers and Reference Materials

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