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The double perovskite praseodymium cobaltite lightly doped with yttrium Pr0.9Y0.1BaCo2O6–δ (PYBCO) was obtained by combustion of organo-metallic precursors and shown to have a tetragonal structure with the crystalline lattice parameters a=b=3.903 and c=7.621Å. The PYBCO composition occurs remarkably stable as show coulometric titration measurements of oxygen content (6–δ) in the oxygen pressure range...
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