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Get Free AccessBased on X-ray diffraction and electron microscopy it is shown that oxides of the general formula La Ba2Cu3O7−δ become tetragonal when δ deviates slightly from 0. This tetragonal structure is similar to that of La3−x Ba3+x Cu6O14+δ, with a cubic perovskite subcell and triple periodicity. Electron micrographs of these tetragonal oxides show 90° microdomains. Orthorhombic LaBa2Cu3O7−δ with high T c (∼77 K) is found only when δ ⋍ 0; this sample is subject to formation of twins. Fluorine substitution seems to favor superconductivity.
L. Ganapathi, Ashok K. Ganguli, R.A. Mohan Ram, Cnr Rao (1988). A comparative study of superconducting LaBa2Cu3O7−δ and La3−xBa3+xCu6O14+δ. Journal of Solid State Chemistry, 73(2), pp. 593-598, DOI: 10.1016/0022-4596(88)90154-5.
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Type
Article
Year
1988
Authors
4
Datasets
0
Total Files
0
Language
English
Journal
Journal of Solid State Chemistry
DOI
10.1016/0022-4596(88)90154-5
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