Abstract
Abstract A new misfit layer cobaltite Bi 0.87 SrO 2 2 CoO 2 1.82 has been synthesized. Its structure, solved from a single crystal X-ray investigation, shows CdI 2 type CoO 2 layers similar to those encountered in misfit chalcogenides, but different rock salt (RS)-type Bi 0.87 SrO 2 layers. In contrast to the chalcogenides, these RS layers exhibit an intrinsic modulation due, as in the 2201 cobaltites, to the presence of double bismuth layers. Another fundamental difference with respect to misfit chalcogenides concerns the existence of strong Sr-O bonds between the CoO 2 layers and the Bi 0.87 SrO 2 layers, instead of weak bonds.
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