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 language | English |
|---|---|
| Pages (from-to) | 56-63 |
| Number of pages | 8 |
| Journal | Journal of Solid State Chemistry |
| Volume | 127 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1996 Nov 15 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
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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 journal › Article
}
TY - JOUR
T1 - A neutron diffraction study of Ca doped and oxygen deficient YBa2Cu3O7-δ
AU - Berastegui, P.
AU - Eriksson, S. G.
AU - Johansson, L. G.
AU - Kakihana, M.
AU - Osada, M.
AU - Mazaki, H.
AU - Tochihara, S.
PY - 1996/11/15
Y1 - 1996/11/15
N2 - 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.
AB - 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.
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U2 - 10.1006/jssc.1996.0356
DO - 10.1006/jssc.1996.0356
M3 - Article
VL - 127
SP - 56
EP - 63
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 1
ER -