Synthesis and structure of oxygen-deficient La2NiCoO5 and LaSrCo2O5 phases

Sivarajan Ramesh; Solomon S. Manoharan; Manjanath S. Hegde

doi:10.1039/JM9950501053

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Journal of Materials Chemistry

Issue 7, 1995

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Synthesis and structure of oxygen-deficient La₂NiCoO₅ and LaSrCo₂O₅ phases

Sivarajan Ramesh, Solomon S. Manoharan and Manjanath S. Hegde

J. Mater. Chem., 1995,5, 1053-1057

DOI: 10.1039/JM9950501053

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Abstract
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The La₂NiCoO₅ and LaSrCo₂O₅ phases have been synthesized by the temperature-programmed reduction (TPR) of the parent mixed perovskites LaNi_0.5Co_0.5O₃ and La_0.5Sr_0.5CoO₃, respectively, under an ammonia atmosphere. While La₂NiCoO₅ adopts a structure similar to the vacancy-ordered La₂Ni₂O₅, LaSrCo₂O₅ crystallized in a brownmillerite-like structure. The reactivity of the perovskite oxides towards reduction by ammonia and the structure of the product oxides are found to be guided by factors such as the coordination and oxidation state of the transition-metal cations.

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Synthesis and structure of oxygen-deficient La2NiCoO5 and LaSrCo2O5 phases

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Synthesis and structure of oxygen-deficient La₂NiCoO₅ and LaSrCo₂O₅ phases