Thermal expansion behavior and high-temperature transport properties of Sr3YCo4 - xFexO10.5 + y, x = 0.0, 1.0, 2.0 and 3.0

S. Ya Istomin, O. A. Drozhzhin, Ph S. Napolsky, S. N. Putilin, A. A. Gippius, E. V. Antipov

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

High-temperature X-ray diffraction revealed peculiarities of thermal expansion of Sr3YCo4O10.5 with tetragonal 314-structure such as anisotropy of the lattice expansion (thermal expansion coefficient of the a-parameter TECav(a) = 18.6 ppm K- 1, TEC(c) = 25.6 ppm K- 1) and two intermediate regions with different TEC anisotropy: TEC(c)/TEC(a) = 1.98 at 298-773 K and 0.96 at 773-1173 K. Replacement of Co by Fe in Sr3YCo4 - xFexO10.5 + y leads to decreasing of TEC at T < 673 K to 16.6 ppm K- 1 for x = 1.0 and 14.6 ppm K- 1 for x = 3.0. At T > 673 K increase of TEC up to ∼ 20 ppm K- 1 due to the oxygen loss from the crystal structure is observed. Sr3YCo4 - xFexO10.5 + y compounds show high electrical conductivity values at 1173 K up to ∼ 200 S/cm for Sr3YCo4O10.5. A decrease in conductivity at high temperature is observed with increasing the Fe-content.

Original languageEnglish
Pages (from-to)1054-1057
Number of pages4
JournalSolid State Ionics
Volume179
Issue number21-26
DOIs
Publication statusPublished - 15 Sep 2008
Externally publishedYes

Keywords

  • 314-phases
  • Cobaltites
  • High-temperature transport properties
  • High-temperature X-ray diffraction
  • Perovskites
  • Thermal expansion

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