Abstract
A new substituted cuprate, HgBiSr7Cu2SbO15, has been isolated; its structure has been determined by powder X-ray diffraction and high resolution electron microscopy. It crystallizes in the orthorhombic system with a = 7.6799(5) Å ≈ 2ap , b = 11.5549(7) Å ≈ 3ap , c = 8.8795(4) Å ≈ c1201 . This structure belongs to the 1201 type family, i.e., consists of single perovskite octahedral layers intergrown with double rock salt layers. But its originality deals with a double cationic 1:2 ordering in the SbCu2 perovskite layers and Sr(Hg, Bi)2 rock salt layers, leading to the formulation ([(Hg, Bi)2][SrO3][Sr3O3])RS (Sr3Cu2SbO9)p. This correlated ordering between two kinds of layers is explained in terms of the size of the different metallic elements. The microstructural study shows that other types of ordering are observed locally in the matrix.
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