Abstract
By means of electron microscopy and diffraction together with EDX and EELS, we have confirmed the main characteristics of the structure of the recently discovered HTSC family of “copper/carbonate cuprates”. These can be obtained at high pressure and have critical temperatures of the order of 117 K. It consists of a copper/carbonate ordered variant of the tetragonal “single X-O layered” cuprate structure. The unit cell is given by a=2 a t, b= b t and c=2 c t, where subindex t corresponds to the tetragonal single layer cell.
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