Abstract
Structural study of the La-Ba(Sr)-Cu oxides was made by means of electron diffraction and microscopy at room temperature. In the orthorhombic La1.9Ba0.1CuO4 weak extra reflections are found and the space group was determined as Pccm. On the other hand, no extra reflections are found for the tetragonal La1.8Ba0.2CuO4 with onset Tc=28 K and La1.8Sr0.2CuO4 with onset Tc=36 K. High resolution reveals the metal atom arrangement in these compounds.
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