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A new lot of high-purity silicon powder with mean crystallite size of about 6 μm has been certified as Standard Reference Material 640a. This SRM can be used as both an external and an internal 2θ calibration standard. The lattice parameter, uncorrected for refraction, is a = 5.430825(11) for λ(Cu Kα1) = 1.5405981 Å at 298.1 K.