Abstract
An ordered arrangement of carbon and copper atoms in the new compound (C 0.4Cu 0.6)Sr 2(Y 0.86Sr 0.14)Cu 2O 7 was investigated by means of electron diffraction and high-resolution electron microscopy. Electron diffraction patters show diffuse superlattice reflections corresponding to a compositional modulation with periods in the range from 2 a to 3 a along the a-axis and 2 c along the c-axis. From observed high-resolution images, it is concluded that the modulated arrangement of carbon and copper atoms is responsible for the diffuse superlattice reflections. It is proposed that this modulated structure consists of two kinds of superstructure units having dimensions of 2 a× b×2 c and 3 a× b×2 c. There are two different atomic arrangements in the 3 a× b×2 c units.
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