This Standard Reference Material (SRM®) is intended for use as a standard for calibration of diffraction line positions and line shapes, determined through powder diffractometry. A unit of NIST-640f consists of approximately 7.5 g of silicon powder bottled under argon. Certified values /// Sample value(s) - please ask for current certificate.
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NIST provides over 1300 Standard Reference Materials® as well as articles and practice guides describing the development, analysis and use of SRMs.
NIST Standard Reference Materials are used by analytical laboratories in industry, academia and government in order to facilitate commerce and trade and to advance research and development. The SRMs are produced by the engineering laboratory, the material measurement laboratory, and the physical measurement laboratory at NIST. They are available for chemical composition, physical properties, and engineering materials.