A1 Refereed original research article in a scientific journal
Preparation of superconducting YBa2Cu3O7-delta nanopowder by deoxydation in Ar before final oxygenation
Authors: Raittila J, Huhtinen H, Paturi P, Stepanov YP
Publisher: ELSEVIER SCIENCE BV
Publication year: 2002
Journal:: Physica C: Superconductivity and its Applications
Journal name in source: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Journal acronym: PHYSICA C
Volume: 371
Issue: 2
First page : 90
Last page: 96
Number of pages: 7
ISSN: 0921-4534
DOI: https://doi.org/10.1016/S0921-4534(01)01059-0
Abstract
Superconducting YBa2Cu3O7-delta nanopowder is prepared by the citrate-gel modification of the sol-gel method. Most important advantages of this method are the homogeneity at atomic level and possibility to reduce the calcination temperature to limit thermal agglomeration of the particles. A preparation temperature less than or equal to800 degreesC is used with a deoxydation step in Ar before the final oxidation. The X-ray diffraction data confirm the orthorhombic structure of the nanopowder. Superconducting properties are investigated with a SQUID magnetometer showing that the global T-c = 92 K. Single grains of the powder have average diameter of 60-80 nm, depending on the calcination process used. The grains are weakly connected stacks of flat particles having thickness of a few nanometer. (C) 2001 Elsevier Science B.V. All rights reserved.
Superconducting YBa2Cu3O7-delta nanopowder is prepared by the citrate-gel modification of the sol-gel method. Most important advantages of this method are the homogeneity at atomic level and possibility to reduce the calcination temperature to limit thermal agglomeration of the particles. A preparation temperature less than or equal to800 degreesC is used with a deoxydation step in Ar before the final oxidation. The X-ray diffraction data confirm the orthorhombic structure of the nanopowder. Superconducting properties are investigated with a SQUID magnetometer showing that the global T-c = 92 K. Single grains of the powder have average diameter of 60-80 nm, depending on the calcination process used. The grains are weakly connected stacks of flat particles having thickness of a few nanometer. (C) 2001 Elsevier Science B.V. All rights reserved.
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