Ganapathi, L and Ganguli, AK and Ram, Mohan RA and Rao, CNR (1988) A comparative study of superconducting LaBa2Cu3O7−δ and La3−xBa3+xCu6O14+δ. In: Journal of Solid State Chemistry, 73 (2). pp. 593-598.
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Based 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−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 (not, vert, similar77 K) is found only when δ reverse similar, equals 0; this sample is subject to formation of twins. Fluorine substitution seems to favor superconductivity.
|Item Type:||Editorials/Short Communications|
|Additional Information:||Copyright of this article belongs to Elsevier science.|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit|
|Date Deposited:||31 Aug 2010 06:37|
|Last Modified:||19 Sep 2010 06:15|
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