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Certification of Standard Reference Material 660c for powder diffraction

机译：粉末衍射标准参考材料660C的认证

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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 B-11 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 degrees C of a = 0.415 682 6 +/- 0.000 008 nm (95% confidence). (C) The National Institute of Technology 2020 outside of the United States of America.
机译：国家标准与技术研究所（NIST）认证了一套标准参考资料（SRMS），以评估X射线和中子粉末衍射计的仪器性能的具体方面。本报告描述了SRM 660C，第四代该粉末衍射SRM，其主要用于校准相对于线位置和线形状的粉末衍射计，用于确定仪器曲线功能（IPF）。它得到了晶格参数认证，由大约6g六硼化镧（Lab6）粉末组成。因此，该SRM适用于中子衍射群落，粉末由同位素富集的B-11前体材料制备。实验室6粉末的微观结构专门用于产生高于上方的微晶尺寸，其中通常观察到尺寸展宽并最小化导致应变展现的晶体缺陷。使用许多高级设计功能的NIST构建的衍射仪用于认证Lab6粉末的晶格参数。 A型，统计和B型，系统，系统，不确定因素都被分配以在22.5摄氏度的A = 0.415 682 6 +/- 0.000 008nm（95％置信度）的22.5摄氏度下产生晶格参数的认证值。 （c）美国国立科技学会2020年在美利坚合众国之外。

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