209.1 - Diffraction and Scattering

SRMs 656, 676a, 674b, 1878b and 1879b consist of high phase purity materials for use in the quantitative analysis of samples by the internal standard method. SRM 656 consists of a combination of the α and β polymorphs; one is high in the α phase content (α 656), while the other contains a larger amount of the β polymorph (β 656). SRMs 640e, 660c, 675, and 1976b consist of materials with select crystallographic and microstructure properties used in the evaluation of diffraction equipment for the following variables; 1) d-spacing or line position, 2) line or instrument intensity, and 3) instrumental or sample contributions to the shape of reflection profiles. SRM 1976b, a sintered alumina plate, is also certified with respect to lattice parameters as well as 13 relative intensity values from 22° to 155° 2q (Cu Ka ). SRM 1990 is certified for lattice parameter. 

PLEASE NOTE: The tables are presented to facilitate comparisons among a family of materials to help customers select the best SRM for their needs. For specific values and uncertainties, the certificate is the only official source.

- Certified values are normal font
- Reference values are italicized
- Values in parentheses are for information only

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	SRM	Description	Unit Size		Application
	640f Now Selling	Line Position and Line Shape Standard for Powder Diffraction (Silicon Powder)	7.5 g		Line Position Line Shape
	656 Now Selling	Silicon Nitride Powders (Quantitative Analysis Powder Diffraction Standard)	2 x 10 g		Quantitative Analysis
	660c Now Selling	Line Position and Line Shape Standard for Powder Diffraction (Lanthanum Hexaboride Powder)	6 g		Line Position Line Shape
	674b Out of Stock	X-Ray Powder Diffraction Intensity Set (Quantitative Powder Diffraction Standard)	10.00 g (powder)		Quantitative Analysis
	675 Now Selling	Line Position, Mica (XRD)	7.5 g		Line Position - Low 2θ
	676a Out of Stock	Alumina Powder (Quantitative Analysis Powder Diffraction Standard)	20 g		Quantitative Analysis
	1878b Now Selling	Respirable Alpha Quartz (Quantitative X-Ray Powder Diffraction Standard)	5 g		Quantitative Analysis
	1879b Now Selling	Respirable Cristobalite (Quantitative X-Ray Powder Diffraction Standard)	5 g		Quantative Analysis
	1976c Now Selling	Instrument Response Standard for X-Ray Powder Diffraction	1 disc		Line Position, Intensity, 2θ
	1979 Now Selling	Powder Diffraction Line Profile Standard for Crystallite Size Analysis(Nano-Crystalline ZnO Powder)	2 x 3 g		Line shape Crystalline size
	1990 Now Selling	Single Crystal Diffractometer Alignment Standard - Ruby Sphere	3 spheres		Quantitative Analysis
	2000 Now Selling	Calibration Standard for High-Resolution X-Ray Diffraction	1 block		Line Position
	3600 Now Selling	Absolute Intensity Calibration Standard for Small-Angle X-ray Scattering	coupon		Small-angle scattering intensity