Ganapathi, L. ; Ganguli, A. K. ; Mohan Ram, R. A. ; Rao, C. N. R. (1988) A comparative study of superconducting LaBa2Cu3O7−δ and La3−xBa3+xCu6O14+δ Journal of Solid State Chemistry, 73 (2). pp. 593-598. ISSN 0022-4596
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002245...
Related URL: http://dx.doi.org/10.1016/0022-4596(88)90154-5
Based on X-ray diffraction and electron microscopy it is shown that oxides of the general formula LaBa2Cu3O7−δ become tetragonal when δ deviates slightly from 0. This tetragonal structure is similar to that of La3−xBa3+xCu6O14+δ, with a cubic perovskite subcell and triple periodicity. Electron micrographs of these tetragonal oxides show 90° microdomains. Orthorhombic LaBa2Cu3O7−δ with high Tc (~77 K) is found only when δ⋍0; this sample is subject to formation of twins. Fluorine substitution seems to favor superconductivity.
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