THE IMGC VOLUME-DENSITY STANDARDS FOR THE AVOGADRO CONSTANT

被引：13

作者：

SACCONI, A

PEUTO, AM

MOSCA, M

PANCIERA, R

PASIN, W

PETTORRUSO, S

机构：

[1] Istituto di Metrologia G. Colonnetti (IMGC), I-10135 Torino

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 1995年 / 44卷 / 02期

关键词：

D O I：

10.1109/19.377900

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Volume-density standards in the form of single-crystal silicon spheres have been introduced and developed at the IMGC. A new sphere of nearly perfect form has been characterized on the basis of a comprehensive set of interferometric, roundness, mass and hydrostatic measurements. From its mass and volume and from the evaluation of the oxide layer and of impurities, a density of (2.32908350 +/- 0.00000036) g/cm(3) has been assigned to a near-perfect silicon crystal. In comparison to the measurements based on a previous sphere, the relative combined uncertainty has been reduced from 4.1 x 10(-7) to 1.5 x 10(-7).

引用

页码：533 / 537

页数：5

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