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Open AccessArticle

Comparison of the Isotopic Composition of Silicon Crystals Highly Enriched in 28Si

Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
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Crystals 2020, 10(6), 500; https://doi.org/10.3390/cryst10060500
Received: 27 May 2020 / Revised: 8 June 2020 / Accepted: 9 June 2020 / Published: 11 June 2020
(This article belongs to the Special Issue Growth and Evaluation of Crystalline Silicon (Volume II))
The isotopic composition and molar mass M of silicon in a new crystal (code: Si28-33Pr11) measured by isotope ratio mass spectrometry using a high-resolution multicollector-inductively coupled plasma mass spectrometer (MC-ICP-MS) is presented using the virtual-element isotope dilution mass spectrometry (VE-IDMS) method. For this new crystal, M = 27.976 950 48 (16) g/mol was determined with urel(M) = 5.7 × 10−9. The “X-ray-crystal-density (XRCD) method”, one of the primary methods for realizing and disseminating the SI units kilogram and mole in the recently revised SI, is based on “counting” silicon atoms in silicon single crystal spheres. One of the key quantities is the isotopic composition—expressed by the molar mass M—of the three stable isotopes 28Si, 29Si, and 30Si in the material highly enriched in 28Si. M was determined with lowest possible uncertainty using latest improvements of the experimental techniques. All uncertainties were estimated according to the “Guide to the expression of uncertainty in measurement, GUM”. The results of the new crystal are discussed and compared with the four previously available crystals, establishing a worldwide limited pool of primary reference spheres of highest metrological quality. View Full-Text
Keywords: silicon single crystals; molar mass; isotope ratios; mass spectrometry; SI revision; mole dissemination; kilogram dissemination silicon single crystals; molar mass; isotope ratios; mass spectrometry; SI revision; mole dissemination; kilogram dissemination
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MDPI and ACS Style

Rienitz, O.; Pramann, A. Comparison of the Isotopic Composition of Silicon Crystals Highly Enriched in 28Si. Crystals 2020, 10, 500.

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