Preparation and structural characterization of perovskite-type LaxLn″1-xCoO3 by the thermal decomposition of heteronuclear complexes, LaxLn″1-x[Co(CN)6] · nH2O (Ln″ = Sm and Ho)

Yoshihiko Sadaoka*, Enrico Traversa, Masatomi Sakamoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Perovskite-type LaxLn″1-xCoO3 oxides are prepared by the thermal decomposition of LaxLn″1-x [Co(CN)6] · nH2O heteronuclear complexes. Except for LaCoO3 (hexagonal), the structures observed for LaxSm1-xCoO3 are orthorhombic. While the perovskite-type oxide HoCoO3 is not formed by decomposition at 1000°C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800°C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as reff = xrLa +(1 - x)rLn″. The distortion parameter for the orthorhombic cell (30.5a/b -1) increases with decrease in reff and is expected to be 0.270 for perovskite-type HoCoO3. The crystal structure of the LaxLn″1-xCoO3 oxides is mainly controlled by the effective radii of Ln ions.

Original languageEnglish (US)
Pages (from-to)51-59
Number of pages9
JournalJournal of Alloys and Compounds
Volume240
Issue number1-2
DOIs
StatePublished - Jul 1 1996

Keywords

  • Heteronuclear complexes
  • Hexacyano complexes
  • Lanthanum cobalt oxides
  • Perovskite-type oxides

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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