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Electrochemical Modification of La2CuO4: The Role Played by Microstructure

  • E. J. Williams (a1) (a2), A. Daridon (a1) (a3), F. Arrouy (a1), J. Fompeyrine (a1) (a3), E. Mächler (a1), H. Siegenthaler (a3) and J.-P. Locquet (a1)...

Using electrochemical oxidation as a probe technique for the mechanisms by which oxidation occurs in c-axis La2CuO4 films, the vital role played by specific through-film microstructural defects has been observed using transmission electron microscopy. These defects are namely the large through-film precipitates sometimes found in these films and {111} planar faults. Two high-oxygen-content phases are formed; one locally and with a superstructure, the other of reduced orthor-hombicity and larger c-axis than as-grown material. Some films were found not to oxidize, and the defects in these films were compared with those in the oxidizable films.

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1. E.J. Opila , H.L. Tulle , and B.J. Wuensch , J. Am. Ceram. Soc. 76, 236 (1993).

4. J.-P. Locquet , C. Gerber , A. Cretton , Y. Jaccard , E.J. Williams and E. Mächler , Appl. Phys. A 57, 211 (1993).

5. F. Arrouy , J.-P. Locquet , E.J. Williams , E. Mächler , R. Berger , C. Gerber , C. Monroux , J.-C. Grenier and A. Wattiaux , Phys. Rev. B 54, 7512 (1996).

6. J.-P. Locquet , F. Arrouy , E. Mächler , M. Despont , P. Bauer and E.J. Williams , Appl. Phys. Lett. 68, 1999(1996).

12. E.J. Williams and W.M. Stobbs , Phil. Mag. A 68, 1 (1993).

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MRS Online Proceedings Library (OPL)
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  • EISSN: 1946-4274
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