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Powder x-ray diffraction of Nd0.9Sr0.1NiO2 (a) and Nd0.8Sr0.2NiO2 (b) and the corresponding Pawley refinement. 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.
