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Electrochemical and high pressure superoxygenation of YCuO2+x and LaCuO2+x delafossites

  • R.J. Cava (a1), W.F. Peck (a1), J.J. Krajewski (a1), S-W. Cheong (a1) and H.Y. Hwang (a1)...

Electrochemical and high pressure oxygenation experiments are described which extend the range of intercalated oxygen content beyond that accessible in 1 atm O2 treatments for the triangular planar cuprate delafossites YCuO2+x and LaCuO2+x, with the intention of increasing the hole doping, and filling vacancies in the intercalated oxygen lattice to decrease electrical resistivities. Stabilization of the 2H polytype of YCuO2 through 1% Ca substitution for Y and oxidation conditions for obtaining the pure orthorhombic intercalated oxygen superlattice form of YCuO2.50 are also described. Temperature dependent resistivities for some of the superoxygenated compositions are reported; metallic behavior was not observed.

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1Cava R. J., Zandbergen H. W., Ramirez A. P., Takagi H., Chen C. T., Krajewski J. J., Peck W. F. Jr., Waszczak J. V., Miegs G., and Schneemeyer L. F., J. Solid State Chem. 104, 437 (1993).
2Ramirez A. P., Walstedt R. E., Cava R. J., Krajewski J. J., Peck W. F. Jr., and Bell R., unpublished.
3Mattheiss L. F., unpublished.
4Natali Sora I., Huang Q., Santoro A., Cava R. J., Krajewski J. J., and Peck W. F. Jr., unpublished.
5Wattiaux A., Park J-C., Grenier J-C., and Pouchard M., C. R. Acad. Sci. Paris 310, 1047 (1990).
6Demorgues A., Weill F., Grenier J. C., Wattiaux A., and Pouchard M., Physica C 192, 425 (1992).
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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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