The Fourth Member of the Tubular Family [Bi2Sr2CoO6] n [Sr8Co6O16- δ]: Bi5.8Sr15.2Co10O40- δ

• Published in: Chemistry of materials Vol. 11; no. 12; pp. 3539 - 3544
• Main Authors: Masset, A. C, Pelloquin, D, Maignan, A, Hervieu, M, Michel, C, Raveau, B
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 20-12-1999
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides; Antiferromagnetism; Inorganic compounds; Electrical conductivity; Transition element compounds; Bismuth oxides; Cobalt oxides; XRD; Experimental study; High-resolution methods; Strontium oxides; Chemical preparation; TEM; Crystal structure
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm9903024

A new cobaltite, Bi5.8Sr15.2Co10O40 - δ, with a tubular structure derived from the 2201-type has been synthesized. This oxide represents the n = 4 member of the large structural [Bi2Sr2MO6] n [Sr8M6O16 ±δ] family (M = Cu, Mn, Co). Its average structure, similar to that of the copper-based phase, crystallizes in the space group Fmmm with cell parameters a = 5.4650(5) Å, b = 34.042(2) Å, and c = 23.574(1) Å. Its complex crystal chemistry has been studied using XRPD and HREM techniques. This structure can be described as an intergrowth along b, of two types of (010) slices: “2201”-type slices [Bi2Sr2CoO6] that are four octahedron thick and cobalt-deficient perovskite-related slices [Sr8Co6O16 - δ] that are one octahedra thick. The study of the magneto-transport properties of this new cobaltite shows an antiferromagnetic behavior below 80 K and a large decrease by 500 of the resistivity at room temperature by annealing under oxygen pressure.