Formation of SrSnO(3) shell-like inclusions in the Bi(2)Sr(2)CaCu(2)O(8+x) superconductor via chemical reactionстатья

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[1] Formation of srsno(3) shell-like inclusions in the bi(2)sr(2)cacu(2)o(8+x) superconductor via chemical reaction / P. E. Kazin, A. S. Karpov, Y. D. Tretyakov, M. Jansen // Solid State Sciences. — 2001. — Vol. 3, no. 3. — P. 285–290. Superconducting composites Bi-2212-SrSnO(3) have been prepared by reacting between the Bi-Sr-Ca-Cu-O precursor and Sr(2)SnO(4) or Ca(2)SnO(4) at 800-950 degreesC, followed by crystallisation of Bi-2212 from the partial melt at decreasing temperature. The samples have been characterised by powder X-ray diffraction, scanning electron microscopy and magnetic measurements. The materials consist of large Bi-2212 lamellae and complex-shaped fine inclusions of SrSnO(3). The composite obtained using Sr(2)SnO(4) contains almost all the SrSnO(3) phase in the form of micron-sized spherical shells, which are partly included in Bi-2212 lamellae, partly agglomerated in-between. The shells are perforated, thus allowing the Bi-2212 crystals to grow through them. It has been found that the shell-like grains form at an early stage of the precursor thermal treatment between 800 and 850 degreesC. A mechanism of the SrSnO(3) shell formation is proposed. The composites exhibit T(c) in the range of 82-87 K and reveal up to five times better magnetic flux pinning at T greater than or equal to 30 K in comparison with the undoped Bi-2212 sample prepared using the same experimental procedure. (C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserved. [ DOI ]

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