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Grain size has marked effects on charge-ordering and other properties of Nd 0.5 A 0.5 MnO 3 (A=Ca or Sr). Thus, the antiferromagnetic (AFM) transition in Nd 0.5 Ca 0.5 MnO 3 is observed distinctly only in samples sintered at 1273K or higher. The sample with a small grain size (sintered at 1173K) shows evidence...
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