Jump to main content
Jump to site search

Issue 8, 2002
Previous Article Next Article

Synthesis, crystal chemistry, and electrical, oxygen permeation, and magnetic properties of LaSr3GaFe2 − xCoxO10 − δ (0 ≤ x ≤ 2 and 0 ≤ δ ≤ 2)

Author affiliations

Abstract

The crystal chemistry and electrical, oxygen permeation, and magnetic properties of the n = 3 member of the Ruddlesden–Popper (R–P) series of phases LaSr3GaFe2 − xCoxO10 − δ, with 0 ≤ x ≤ 2 and 0 ≤ δ ≤ 2, have been investigated. While the orthorhombic cell parameters a and b and the unit cell volume decrease, the c parameter increases with increasing Co content. Conductivity measurements show that the samples exhibit a thermally activated process, with 0.17 ≤Ea ≤ 0.35 eV. The oxygen permeation flux values (jO2 ≈ 1 × 10−9 mol s−1 cm−2) at 900 °C across 1.5 mm thick LaSr3GaFe2 − xCoxO10 − δ membranes are two orders of magnitude lower than those observed previously with other n = 2 and 3 R–P phases (tetragonal) due to the orthorhombic distortion and negligible oxygen vacancy concentration gradient across the membrane. The reduction of the LaSr3GaFe2 − xCoxO10 − δ phases in a mixture of 90% Ar and 10% H2 leads to the formation of LaSr3GaFe2 − xCoxO9 − x/2 phases containing Co2+ and with orthorhombic symmetry. SQUID magnetometer data indicates antiferromagnetic interactions and the presence of high spin Co3+ ions in the LaSr3GaFe2 − xCoxO9 − x/2 phases.

Graphical abstract: Synthesis, crystal chemistry, and electrical, oxygen permeation, and magnetic properties of LaSr3GaFe2 − xCoxO10 − δ (0 ≤ x ≤ 2 and 0 ≤ δ ≤ 2)

Back to tab navigation

Publication details

The article was received on 18 Apr 2002, accepted on 30 May 2002 and first published on 02 Jul 2002


Article type: Paper
DOI: 10.1039/B203778E
J. Mater. Chem., 2002,12, 2390-2395

  •   Request permissions

    Synthesis, crystal chemistry, and electrical, oxygen permeation, and magnetic properties of LaSr3GaFe2 − xCoxO10 − δ (0 ≤ x ≤ 2 and 0 ≤ δ ≤ 2)

    F. Prado, K. Gurunathan and A. Manthiram, J. Mater. Chem., 2002, 12, 2390
    DOI: 10.1039/B203778E

Search articles by author

Spotlight

Advertisements