The counting of 28Si atoms plays a fundamental role in the realisation of the unit of mass in terms of stipulated values of fundamental physical constants. In this realisation, the measurement of the volume of a 28Si sphere is a fundamental step. This paper reports a finite element analysis of the self-weight effect on the volume determination, taking the crystal anisotropy into account. The sphere volume might be overestimated from 0.3 × 10−9 to 5.1 × 10−9 (relative terms), depending on the crystal orientation and measurement procedure.

Gravity and anisotropy effects in the volume determination of Si spheres for the kilogram realisation / Mari, D; Nicolaus, A; Kuhn, E; Kuramoto, N; Mana, G; Massa, E. - In: METROLOGIA. - ISSN 0026-1394. - 57:4(2020), p. 045004. [10.1088/1681-7575/ab7c7d]

Gravity and anisotropy effects in the volume determination of Si spheres for the kilogram realisation

Mari, D
;
Mana, G;Massa, E
2020

Abstract

The counting of 28Si atoms plays a fundamental role in the realisation of the unit of mass in terms of stipulated values of fundamental physical constants. In this realisation, the measurement of the volume of a 28Si sphere is a fundamental step. This paper reports a finite element analysis of the self-weight effect on the volume determination, taking the crystal anisotropy into account. The sphere volume might be overestimated from 0.3 × 10−9 to 5.1 × 10−9 (relative terms), depending on the crystal orientation and measurement procedure.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/63130
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