Excess oxygen diffusion in La2cuo4+δ investigated by mechanical spectroscopy View Full Text


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Article Info

DATE

1996-12

AUTHORS

B. Kappesser, H. Wipf, R. K. Kremer

ABSTRACT

The diffusion of excess oxygen atoms in La2CuO4+δ, (0 < δ < 0.035) was studied by mechanical spectroscopy with a vibrating reed method (220 Hzwith increasing frequencies indicating a thermally activated relaxation behavior with an activation enthalpy of 0.31(3) eV. The relaxation peak vanishes after vacuum annealing the sample (δ ≈0) leading to the conclusion that the relaxation peak is due to the diffusion of excess oxygen atoms. A relaxation peak of similar strength as in the sample with δ =0.013 is also detected in an oxygen enriched sample (δ = 0.035). This unexpected finding of the relaxation strength is discussed in terms of the proposed phase diagrams for La2CuO4+δ. In addition, a shoulder at the high temperature wing of the strong relaxation peak is seen the position of which does not vary with the vibration frequencies. More... »

PAGES

1481-1486

References to SciGraph publications

  • 1992-10. Percolative phase separation in La2CuO4+δ and La2−xSrxCuO4 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00753909

    DOI

    http://dx.doi.org/10.1007/bf00753909

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1001539378


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