FIG. 5.
High-energy in situ x-ray data showing the evolution from (a) NdNiO3 to Nd3Ni3O7 and (b) Nd3Ni3O7 to NdNiO2. The 113, 112, and 337 denote NdNiO3, NdNiO2, and Nd3Ni3O7 phases, respectively.
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