Crystal structure and oxygen storage properties of BaLnMn2O5+δ (Ln: Pr, Nd, Sm, Gd, Dy, Er and Y) oxides

Alicja Klimkowicz, Konrad ͆wierczek, Akito Takasaki, Janina Molenda, Bogdan Dabrowski

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

In this paper we report on crystal structure and oxygen storage properties of A-site cation ordered BaLnMn2O5+δ (Ln: Pr, Nd, Sm, Gd, Dy, Er and Y) perovskite-type oxides. The materials show practically complete and reversible change between fully reduced BaLnMn2O5 and oxidized BaLnMn2O6, which occurs at moderate temperatures (300-500 °C) during changes of the oxygen partial pressure (air, 5 vol.% H2 in Ar). Based on the thermogravimetric measurements, reversible oxygen storage capacity, characteristic temperature of oxidation and reduction, as well as kinetics of these processes are given. Structural characterization was performed at room temperature for the reduced and oxidized materials by Rietveld analysis of the XRD data. These results are accompanied by in situ high temperature XRD measurements of the oxidation process, performed for BaNdMn2O5 in air.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalMaterials Research Bulletin
Volume65
DOIs
Publication statusPublished - 2015 May

Keywords

  • Crystal structure
  • Energy storage
  • Oxides
  • Thermogravimetric analysis (TGA)
  • X-ray diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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