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Certification of Standard Reference Material 660c for powder diffraction

Published online by Cambridge University Press:  31 January 2020

David R. Black Open the ORCID record for David R. Black [Opens in a new window] ,
Marcus H. Mendenhall ,
Craig M. Brown ,
Albert Henins ,
James Filliben  and
James P. Cline
David R. Black*
Affiliation:
Materials Measurement Science Division of Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
Marcus H. Mendenhall
Affiliation:
Materials Measurement Science Division of Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
Craig M. Brown
Affiliation:
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
Albert Henins
Affiliation:
Materials Measurement Science Division of Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
James Filliben
Affiliation:
Statistical Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
James P. Cline
Affiliation:
Materials Measurement Science Division of Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland20899, USA
*
a)Author to whom correspondence should be addressed. Electronic mail: david.black@nist.gov
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Abstract

The National Institute of Standards and Technology (NIST) certifies a suite of Standard Reference Materials (SRMs) to evaluate specific aspects of instrument performance of both X-ray and neutron powder diffractometers. This report describes SRM 660c, the fourth generation of this powder diffraction SRM, which is used primarily for calibrating powder diffractometers with respect to line position and line shape for the determination of the instrument profile function (IPF). It is certified with respect to lattice parameter and consists of approximately 6 g of lanthanum hexaboride (LaB6) powder. So that this SRM would be applicable for the neutron diffraction community, the powder was prepared from an isotopically enriched 11B precursor material. The microstructure of the LaB6 powder was engineered specifically to yield a crystallite size above that where size broadening is typically observed and to minimize the crystallographic defects that lead to strain broadening. A NIST-built diffractometer, incorporating many advanced design features, was used to certify the lattice parameter of the LaB6 powder. Both Type A, statistical, and Type B, systematic, uncertainties have been assigned to yield a certified value for the lattice parameter at 22.5 °C of a = 0.415 682 6 ± 0.000 008 nm (95% confidence).

Keywords

certificationdiffractometerlattice parameterStandard Reference MaterialX-ray diffraction

Information

Type
Technical Article
Information
Powder Diffraction , Volume 35 , Issue 1 , March 2020 , pp. 17 - 22
Creative Commons
As a work owned by the United States Government, this Contribution is not subject to copyright within the United States. Outside of the United States, Cambridge is the exclusively licensed publisher of the Contribution. The United States Government retains a non-exclusive, irrevocable, worldwide license to publish or reproduce the published form of this Contribution far United States Government purposes.
Copyright
Copyright © The National Institute of Technology 2020 outside of the United States of America

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