Abstract
We summarize here results of a fairly detailed study by high-resolution electron microscopy and electron diffraction of the high-temperature superconductor YBa2Cu3O7-δ. Data from the perfect structure for (100), (110), and (001) zones indicate that the material has an oxygen-deficient perovskite structure as previously reported from X-ray and neutron diffraction studies. In some cases planar defects along (001) directions were observed. A more important observation is the existence of a phase with disorder of the Y and Ba ion positions and of an additional amorphous phase. The perfectly ordered (defect-free) phase grows from the disordered material, and the planar defects are probably due to mechanical deformation during preparation of the material. These defects probably are not related to the superconducting properties, as recently suggested. The conclusions are consistent with the commonly encountered problems in the preparation of superconductors in high yields.
| Original language | English |
|---|---|
| Pages (from-to) | 189-195 |
| Number of pages | 7 |
| Journal | Journal of Solid State Chemistry |
| Volume | 69 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1987 |
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ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
Cite this
Order-disorder in YBa2Cu3O7. / Marks, L. D.; Zhang, J. P.; Hwu, S. J.; Poeppelmeier, Kenneth R.
In: Journal of Solid State Chemistry, Vol. 69, No. 1, 1987, p. 189-195.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Order-disorder in YBa2Cu3O7
AU - Marks, L. D.
AU - Zhang, J. P.
AU - Hwu, S. J.
AU - Poeppelmeier, Kenneth R
PY - 1987
Y1 - 1987
N2 - We summarize here results of a fairly detailed study by high-resolution electron microscopy and electron diffraction of the high-temperature superconductor YBa2Cu3O7-δ. Data from the perfect structure for (100), (110), and (001) zones indicate that the material has an oxygen-deficient perovskite structure as previously reported from X-ray and neutron diffraction studies. In some cases planar defects along (001) directions were observed. A more important observation is the existence of a phase with disorder of the Y and Ba ion positions and of an additional amorphous phase. The perfectly ordered (defect-free) phase grows from the disordered material, and the planar defects are probably due to mechanical deformation during preparation of the material. These defects probably are not related to the superconducting properties, as recently suggested. The conclusions are consistent with the commonly encountered problems in the preparation of superconductors in high yields.
AB - We summarize here results of a fairly detailed study by high-resolution electron microscopy and electron diffraction of the high-temperature superconductor YBa2Cu3O7-δ. Data from the perfect structure for (100), (110), and (001) zones indicate that the material has an oxygen-deficient perovskite structure as previously reported from X-ray and neutron diffraction studies. In some cases planar defects along (001) directions were observed. A more important observation is the existence of a phase with disorder of the Y and Ba ion positions and of an additional amorphous phase. The perfectly ordered (defect-free) phase grows from the disordered material, and the planar defects are probably due to mechanical deformation during preparation of the material. These defects probably are not related to the superconducting properties, as recently suggested. The conclusions are consistent with the commonly encountered problems in the preparation of superconductors in high yields.
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UR - http://www.scopus.com/inward/citedby.url?scp=0023384364&partnerID=8YFLogxK
U2 - 10.1016/0022-4596(87)90027-2
DO - 10.1016/0022-4596(87)90027-2
M3 - Article
VL - 69
SP - 189
EP - 195
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 1
ER -