Synthesis of metastable rare-earth-iron mixed oxide with the hexagonal crystal structure

Tatsuya Nishimura, Saburo Hosokawa, Yuichi Masuda, Kenji Wada, Masashi Inoue

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Rare-earth-iron mixed oxides with the rare earth/iron ratio=1 have either orthorhombic (o-REFeO 3) or hexagonal (h-REFeO 3) structure. h-REFeO 3 is a metastable phase and the synthesis of h-REFeO 3 is usually difficult. In this work, the crystallization process of the precursors obtained by co-precipitation and Pechini methods was investigated in detail to synthesize h-REFeO 3. It was found that the crystallization from amorphous to hexagonal phase and the phase transition from hexagonal to orthorhombic phase occurred at a similar temperature range for rare earth elements with small ionic radii (Er-Lu, Y). For both co-precipitation and Pechini methods, single-phase h-REFeO 3 was obtained by shortening the heating time during calcination process. The hexagonal-to-orthorhombic phase transition took place by a nucleation growth mechanism and vermicular morphology of the thus-formed orthorhombic phase was observed. The hexagonal YbFeO 3 had higher catalytic activity for C 3H 8 combustion than orthorhombic YbFeO 3.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalJournal of Solid State Chemistry
Volume197
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Catalyst
  • Co-precipitation method
  • Hexagonal phase
  • Rare-earth-iron mixed oxide

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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