Density comparison measurements of silicon crystals by a pressure-of-flotation method at NMIJ

被引:30
作者
Waseda, A [1 ]
Fujii, K [1 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058563, Japan
关键词
D O I
10.1088/0026-1394/41/2/S06
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A new density comparison apparatus based on a pressure-of-flotation method (PFM) is presented. Density comparison measurements are performed for a new silicon crystal of the National Metrology Institute of Japan (NMIJ) for the density standard and determination of the Avogadro constant. The density comparison measurement of silicon crystals by the new PFM apparatus has an estimated relative standard uncertainty of 4.0 x 10(-8). Adjusted values of density are evaluated from the data of the PFM and absolute measurements using a least-squares algorithm, where correlations are taken into consideration.
引用
收藏
页码:S62 / S67
页数:6
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