Determining the crystallographic orientation of Avogadro silicon spheres
نویسندگان
چکیده
منابع مشابه
Mass Determination of Silicon Spheres Used for the Avogadro Project
Spheres made of a silicon single crystal with a mass of about 1 kg are used as density standards and in the context of a project for the determination of the Avogadro constant. The status of the mass determination of such silicon spheres at the PTB is presented. Special facilities and procedures used for the mass determination in air are described. Results for a single sphere and the mass diffe...
متن کاملMass determination of 1 kg silicon spheres for Avogadro project
Our work concerns the mass determination of 1 kg silicon spheres in the framework of the international Avogadro project with a view to an improved definition of the kilogram. It has been shown that the original method developed by the BIPM will attain reach the uncertainty target requested by the Avogadro group. New investigations have been initiated at the BIPM using a well adapted mass compar...
متن کاملThe Avogadro constant : determining the number of atoms in a single - crystal 28 Si sphere
The Avogadro constant, the number of entities in an amount of substance of one mole, links the atomic and the macroscopic properties of matter. Since the molar Planck constant—the product of the Planck constant and the Avogadro constant—is very well known via the measurement of the Rydberg constant, the Avogadro constant is also closely related to the Planck constant. In addition, its accurate ...
متن کاملCrystallographic plane-orientation dependent atomic force microscopy-based local oxidation of silicon carbide
The effect of crystalline plane orientations of Silicon carbide (SiC) (a-, m-, and c-planes) on the local oxidation on 4H-SiC using atomic force microscopy (AFM) was investigated. It has been found that the AFM-based local oxidation (AFM-LO) rate on SiC is closely correlated to the atomic planar density values of different crystalline planes (a-plane, 7.45 cm-2; c-plane, 12.17 cm-2; and m-plane...
متن کاملVolume determination of the Avogadro spheres of highly enriched Si with a spherical Fizeau interferometer
Within the scope of the efforts concerning the redefinition of the SI base unit “kg” the final results of the international research project aiming at the redetermination of the Avogadro constant are ready to be announced. Among other quantities the volume of two spheres which are made of a highly enriched Si single crystal had to be determined. For this purpose a special Fizeau interferometer ...
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ژورنال
عنوان ژورنال: Journal of Applied Crystallography
سال: 2004
ISSN: 0021-8898
DOI: 10.1107/s0021889804021041