Improvement of oxygen storage properties of hexagonal YMnO3+δ by microstructural modifications

Alicja Klimkowicz, Konrad Świerczek, Shuntaro Kobayashi, Akito Takasaki, Wadiah Allahyani, Bogdan Dabrowski

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Hexagonal YMnO3+δ is shown to be an effective temperature-swing oxygen storage material working at low temperatures (150–300 °C) in pure oxygen if adequately processed or obtained having sub-micrometer primary particles with limited number of big agglomerates. A substantial increase of a practical oxygen storage capacity is observed for a sample synthesized by a solid-state method, which was subjected to a high impact mechanical milling. However, even better properties can be achieved for the sol-gel technique-produced YMnO3+δ. The reversible incorporation and release of the oxygen is associated with a structural transformation between stoichiometric YMnO3 (Hex0) phase and a mixture of oxygen-loaded Hex1 with δ ≈ 0.28 and Hex2 with δ ≈ 0.41 phases, as documented by in situ structural X-ray diffraction studies, supported by thermogravimetric experiments. Contrary to HoMnO3+δ, it was not possible to obtain single phase Hex1 material in oxygen, as well as to oxidize YMnO3 in air. Results confirm crucial role of the ionic size of rare earth element Ln on the oxygen storage-related properties and stability of the oxygen-loaded LnMnO3+δ phases.

Original languageEnglish
Pages (from-to)471-476
Number of pages6
JournalJournal of Solid State Chemistry
Volume258
DOIs
Publication statusPublished - 2018 Feb 1

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Keywords

  • Hexagonal YMnO
  • Microstructure
  • Oxygen storage materials
  • Thermogravimetry
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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