A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ

P. Berastegui, S. G. Eriksson, L. G. Johansson, M. Kakihana, M. Osada, H. Mazaki, S. Tochihara

Research output: Contribution to journalArticle

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Abstract

A detailed study of the structure of Ca doped YBa2Cu3O7-δ samples with different oxygen contents has been carried out. Neutron powder diffraction data were collected for nine samples with varying Ca and oxygen contents and the structural changes were determined by Rietveld refinement. The samples were prepared by annealing at different oxygen partial pressures and for the undoped samples δ values of 0.03, 0.38, and 0.95 were obtained. A decrease in the oxygen content with Ca doping is observed for the orthorhombic samples. Tc decreases due to overdoping in the fully oxidized samples and increases in the partially oxidized samples. The bond lengths change in a similar manner for both the fully and partially oxidized samples. The structural changes are related to the increasing oxygen deficiency in the CuO chains and to the change in average charge and ion size at the Y site. In the fully reduced samples, only the oxygen ions at the CuO2 planes are significantly affected by substitution.

Original languageEnglish
Pages (from-to)56-63
Number of pages8
JournalJournal of Solid State Chemistry
Volume127
Issue number1
DOIs
Publication statusPublished - 1996 Nov 15
Externally publishedYes

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Neutron diffraction
neutron diffraction
Oxygen
oxygen
Ions
Rietveld refinement
Neutron powder diffraction
Bond length
Partial pressure
barium copper yttrium oxide
Substitution reactions
hypoxia
Doping (additives)
Annealing
oxygen ions
partial pressure
substitutes
neutrons
annealing
diffraction

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Berastegui, P., Eriksson, S. G., Johansson, L. G., Kakihana, M., Osada, M., Mazaki, H., & Tochihara, S. (1996). A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ. Journal of Solid State Chemistry, 127(1), 56-63. https://doi.org/10.1006/jssc.1996.0356

A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ. / Berastegui, P.; Eriksson, S. G.; Johansson, L. G.; Kakihana, M.; Osada, M.; Mazaki, H.; Tochihara, S.

In: Journal of Solid State Chemistry, Vol. 127, No. 1, 15.11.1996, p. 56-63.

Research output: Contribution to journalArticle

Berastegui, P, Eriksson, SG, Johansson, LG, Kakihana, M, Osada, M, Mazaki, H & Tochihara, S 1996, 'A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ', Journal of Solid State Chemistry, vol. 127, no. 1, pp. 56-63. https://doi.org/10.1006/jssc.1996.0356
Berastegui P, Eriksson SG, Johansson LG, Kakihana M, Osada M, Mazaki H et al. A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ. Journal of Solid State Chemistry. 1996 Nov 15;127(1):56-63. https://doi.org/10.1006/jssc.1996.0356
Berastegui, P. ; Eriksson, S. G. ; Johansson, L. G. ; Kakihana, M. ; Osada, M. ; Mazaki, H. ; Tochihara, S. / A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ. In: Journal of Solid State Chemistry. 1996 ; Vol. 127, No. 1. pp. 56-63.
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