Journal
POWDER DIFFRACTION
Volume 26, Issue 2, Pages 155-158Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1154/1.3591064
Keywords
standard reference material; X-ray diffraction; certification; unit-cell parameter; diffractometer
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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 B-11 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 degrees C. (C) 2011 Contribution of the National Institute of Standards and Technology. [DOI: 10.1154/1.3591064]
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