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Neutron diffraction and the corresponding Rietveld refinement of Nd0.9Sr0.1NiO2 at 3 K (a) and at 300 K (b). The black dots are the observed data, the red line is the calculated fit, and gray line shows the difference between the two. Positions of allowed reflections are indicated by vertical black (Nd1–xSrxNiO2) and red (Ni) lines.
