Crystal growth features and properties of layered rare earth and barium cobaltates

G. L. Bychkov, S. V. Shiryaev, A. G. Soldatov, A. S. Shestak, S. N. Barilo, D. V. Sheptyakov, K. Conder, E. Pomjakushina, A. Podlesnyak, A. Furrer, R. Bruetsch

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

High quality single crystals of LnBaCo2O5+δ (0 < δ < 1) (Ln = Pr, Eu, Gd, Tb, Dy) with rectangular shape and average dimensions 5 mm × 5 mm × 1 mm were grown for the first time from overstoichiometric flux melt. The data on the primary crystallization field of most cobaltate phases, which appear in parts of corresponding Gibbs triangles in the range 1373 - 1523 K are discussed. Bulk single crystals of new phases HoBaCo4O7 up to 300 mm3, YBaCo 4O7 and TbBaCo4O7 up to 10 mm 3 in volume were grown first. A solution of these compounds structure has been found in the space group P63mc. For the Ln = Pr, Gd, Sm, Tb, Dy, Ho based systems under the liquidus line there are several other new cobaltate phases of both perovskite, and hexagonal crystal structure. Stability of the double perovskite phase and temperature of the antiferromagnetic - ferromagnetic phase transition in relation to the radius of rare earth ions are compared. The data on the exact analysis of chemical composition, including EDX and iodometric titration, as well as results on magnetic susceptibility of EuBaCo1-xAlxO5+δ (0 < x < 0.3) are discussed.

Original languageEnglish
Pages (from-to)395-399
Number of pages5
JournalCrystal Research and Technology
Volume40
Issue number4-5
DOIs
StatePublished - Apr 2005
Externally publishedYes

Keywords

  • Cobaltates
  • Magnetic transition
  • Phase diagram
  • Phase transition
  • Primary crystallization field
  • Single crystal growth

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