The fourth member of the tubular family [Bi{sub 2}Sr{sub 2}CoO{sub 6}]{sub n}[Sr{sub 8}Co{sub 6}O{sub 16{minus}{delta}}]: Bi{sub 5.8}Sr{sub 15.2}Co{sub 10}O{sub 40{minus}{delta}}
A new cobaltite, Bi{sub 5.8}Sr{sub 15.2}Co{sub 10}O{sub 40{minus}{delta}}, with a tubular structure derived from the 2201-type has been synthesized. This oxide represents the n = 4 member of the large structural [Bi{sub 2}Sr{sub 2}MO{sub 6}]{sub n}[Sr{sub 8}M{sub 6}O{sub 16{+-}{delta}}] 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){angstrom}, b = 34.042(2){angstrom}, and c = 23.574(1){angstrom}. 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: 2202-type slices [Bi{sub 2}Sr{sub 2}CoO{sub 6}] that are four octahedron thick and cobalt-deficient perovskite-related slices [Sr{sub 8}Co{sub 6}O{sub 16{minus}{delta}}] 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.
- Research Organization:
- CNRS, Caen (FR)
- OSTI ID:
- 20014835
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 12 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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