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DOI: 10.1039/A808078J (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 545-548

Synthesis and thermal stability of the new copper oxide carbonate Ba4ScCu2O7–xCO3 and other members of the series Ba4ScxCu2Oy(CO3)2–x

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Peter R. Slater and David S. Wragg

Abstract

We report the synthesis of a new perovskite-type oxide carbonate, Ba4ScCu2O7–xCO3. This phase has a tetragonal cell (a=b≈7.99 Å, c≈4.10 Å) based on a doubling of the basic perovskite subcell in the a and b directions. A possible structural model based on an ordering of Sc, Cu and C in the small cation sites is proposed. Experiments on the thermal stability of this phase have shown that raising the synthesis temperature from 940 to 1000[thin space (1/6-em)]°C results in partial carbonate loss and a change in cell to a √2ap×√2ap×2cp cell as previously observed for Ba4YCu2.27O7.08(CO3)0.53. In addition we show that Ba4ScCu2O7–xCO3 may be classed as the x=1 member of the series, Ba4ScxCu2Oy(CO3)2–x and we also report the synthesis of other new phases in this series.

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