Achieving fast oxygen diffusion in perovskites by cation ordering

2005/01/07 by A. A. Taskin, A. N. Lavrov, Yoichi Ando
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1063/1.1864244

published as Appl. Phys. Lett. 86, 091910 (2005) · 4 pages, 4 figures, accepted for publication in Appl.Phys.Lett

arxiv created 2005/01/07 · arxiv updated 2009/12/01

Abstract

The oxygen-exchange behavior has been studied in half-doped manganese and cobalt perovskite oxides. We have found that the oxygen diffusivity in Gd_0.5Ba_0.5MnO_3-δ can be enhanced by orders of magnitude by inducing crystallographic ordering among lanthanide and alkali-earth ions in the A-site sublattice. Transformation of a simple cubic perovskite, with randomly occupied A-sites, into a layered crystal GdBaMn₂O_5+x (or isostructural GdBaCo₂O_5+x for cobalt oxide) with alternating lanthanide and alkali-earth planes reduces the oxygen bonding strength and provides disorder-free channels for ion motion, pointing to an efficient way to design new ionic conductors.

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