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TEM overview image (A) of an exemplary sample of α-NiS nanoparticles and the corresponding size distribution (B). The average diameter of the particles is 16.8 nm ±1.8 nm. (C) X-ray diffraction pattern of the same sample. The obtained crystal phase is hexagonal NiS (α-NiS, PDF card no. 03-065-0395) with no observable impurities.
