Oxygen storage-related properties of substituted BaLnMn <inf>2</inf> O <inf>5</inf>+δ A-site ordered manganites

Konrad Swierczek, Alicja Klimkowicz, Anna Niemczyk, Anna Olszewska, Tomasz Rząsa, Janina Molenda, Akito Takasaki

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Abstract

In this work, we present results showing modification of the oxygen storage-related properties of perovskite-type oxides based on BaYMn<inf>2</inf>O<inf>5+</inf>δ, having A-site layer-type cation order. Y<sup>3+</sup> is the lightest among suitable cations, which allows to obtain such the structural order, and at the same time, it provides the highest theoretical oxygen storage capacity. However, substitution of Y<sup>3+</sup> by Sm<sup>3+</sup>cations may be beneficial, and BaY<inf>0.5</inf>Sm<inf>0.5</inf>Mn<inf>2</inf><inf>O</inf>5+δ material shows enhanced reduction kinetics. Furthermore, partial substitution of Ba<sup>2+ by Sr</sup>2+ increases reversible oxygen storage capacity, but at the same time slows down the reduction speed. In addition, for higher concentration of strontium, it is not possible to obtain single phase materials.

Original languageEnglish
Article number1440004
JournalFunctional Materials Letters
Volume7
Issue number6
DOIs
Publication statusPublished - 2014 Dec 16

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Keywords

  • A-site ordered perovskites
  • BaLnMn <inf>2</inf> O <inf>5+</inf>δ
  • crystal structure
  • oxygen storage materials
  • thermogravimetry

ASJC Scopus subject areas

  • Materials Science(all)

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