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Certification of Standard Reference Material 660B

Published online by Cambridge University Press:  05 March 2012

David R. Black ,
Donald Windover ,
Albert Henins ,
James Filliben  and
James P. Cline
David R. Black*
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Donald Windover
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Albert Henins
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
James Filliben
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
James P. Cline
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
*
a)Author to whom correspondence should be addressed. Electronic mail: david.black@nist.gov
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Abstract

This report describes SRM 660b, the third generation of this powder diffraction SRM used primarily for determination of the instrument profile function (IPF). It is certified with respect to unit-cell parameter. It consists of approximately 6 g LaB6 powder prepared using a 11B isotopically enriched precursor material so as to render the SRM applicable to the neutron diffraction community. The microstructure of the LaB6 powder was engineered to produce 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 unit-cell parameter of the LaB6 powder. Both type A, statistical, and type B, systematic, errors have been assigned to yield a certified value for the unit-cell parameter of a=0.415691(8) nm at 22.5°C.

Keywords

standard reference materialX-ray diffractioncertificationunit-cell parameterdiffractometer
Type
Technical Articles
Information
Powder Diffraction , Volume 26 , Special Issue 2 , June 2011 , pp. 155 - 158
Copyright
Copyright © Cambridge University Press 2011

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