Determination of the Avogadro constant via the silicon route

Abstract

A value for the Avogadro constant, N A , was derived from new measurements of the lattice parameter, the density and the molar mass of a silicon single crystal. The result N A = 6.022 135 3 × 10 23 mol −1 has a relative measurement uncertainty and is in excellent agreement with other published data based on the x-ray crystal density molar mass method, indicating the high repeatability of these experiments. The value differs significantly from the Committee on Data for Science and Technology's most recent recommended value of 6.022 141 99 × 10 23 mol −1 by more than 1 × 10 −6 N A .

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