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A structural study of chemical stability of (Y1−x Ca x)(Ba2−x La x )Cu3O7−δ(x= 0.0, 0.2, and 0.4)

Abstract

Neutron structural studies are made on (Y1−x Ca x)(Ba2−x La x )Cu3O7−δ for compositions corresponding to x=0.0, 0.2, and 0.4 in order to evaluate any correlation between the remarkably high chemical stability of the cosubstituted samples (x=0.2 and 0.4) and the structural parameters. It is suggested that the increased chemical stability is caused by a decrease in the puckering of the Cu-O planes with increase inx, causing them to flatten, which leads to a reduction in the internal stresses existing in the perovskite lattice of this technologically important material.

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Rajagopal, H., Sequeira, A., Ganguly, R. et al. A structural study of chemical stability of (Y1−x Ca x)(Ba2−x La x )Cu3O7−δ(x= 0.0, 0.2, and 0.4). J Supercond 9, 615–618 (1996). https://doi.org/10.1007/BF00728243

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Key words

  • Y-123 structure
  • chemical stability
  • internal stress
  • puckering of Cu-O planes
  • neutron structure