HR-TEM study of oxygen vacancy ordered Sr4+nMn4+nO10+3n compounds

The study of oxygen vacancy ordering in the LaxSr1-xMnOy system has shown a strong correlation between Mn formal valence and coordination to oxygen. The Mn2+ was found forming octahedra (Oc) and tetrahedra (Te), Mn3+ octahedra and pyramids (Py) and Mn4+ only octahedra. This tendency was derived from the presence of three kinds of vacancy orderings in the system. For y>2.5 and the average Mnm+ charge of 20.5), brownmillerite-type structures are found with Mn2+/3+ Oc and Mn2+ Te. [1] For 3

Keywords: manganites; oxygen-vacancy ordering; HR-TEM.

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