Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Achieving fast oxygen diffusion in perovskites by cation ordering   The oxygen-exchange behavior has been studied in half-doped manganese and
cobalt perovskite oxides. We have found that the oxygen diffusivity in
Gd_{0.5}Ba_{0.5}MnO_{3-\delta} 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 GdBaMn_2O_{5+x} (or
isostructural GdBaCo_2O_{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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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas