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- W1613804542 abstract "We report herein results concerning the solid solutions Pr2−xMxNiO4+δ,M=La, Sr. These two cations are larger than praseodymium and lead to a structural stabilization. The oxygen excessδdecreases withxfor La and Sr substituted Pr2NiO4+δ. Both cases suggest that structural strain is a leading factor for the oxygenation ability of the title compounds. From the evolution of cell parameters, we suggest a phase transition for La substituted compounds occurring forx∼1–1.2. Surprisingly, this transition has a negligible effect on transport properties. On the other hand, a charge localization linked to the presence of praseodymium is observed. Owing to charge compensation, the Sr substituted compounds have a quasi-constant hole concentration (formally 50%) forx<0.5. The Pr2−xSrxNiO4+δsolid solution shows an anomalous behavior forx=0.5 corresponding to Ni2+/Ni3+=1. This anomaly combines an enhancement of thec/aratio, a larger resistivity, and a peak for the activation energy of the resistivity versusT." @default.
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- W1613804542 date "1997-06-01" @default.
- W1613804542 modified "2023-09-25" @default.
- W1613804542 title "La and Sr Substituted Pr2NiO4+δ: Oxygenation and Electrical Properties" @default.
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- W1613804542 doi "https://doi.org/10.1006/jssc.1997.7402" @default.
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