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Certification of Standard Reference Material 660B

  • David R. Black (a1), Donald Windover (a1), Albert Henins (a1), James Filliben (a1) and James P. Cline (a1)...

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.

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a)Author to whom correspondence should be addressed. Electronic mail: david.black@nist.gov

References

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Keywords

Certification of Standard Reference Material 660B

  • David R. Black (a1), Donald Windover (a1), Albert Henins (a1), James Filliben (a1) and James P. Cline (a1)...

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