A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Preparation of superconducting YBa2Cu3O7-delta nanopowder by deoxydation in Ar before final oxygenation
Tekijät: Raittila J, Huhtinen H, Paturi P, Stepanov YP
Kustantaja: ELSEVIER SCIENCE BV
Julkaisuvuosi: 2002
Lehti:: Physica C: Superconductivity and its Applications
Tietokannassa oleva lehden nimi: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Lehden akronyymi: PHYSICA C
Vuosikerta: 371
Numero: 2
Aloitussivu: 90
Lopetussivu: 96
Sivujen määrä: 7
ISSN: 0921-4534
DOI: https://doi.org/10.1016/S0921-4534(01)01059-0
Tiivistelmä
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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