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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/8422
Title: 
Study of interstitial oxygen mobility in RuSr2GdCu2O8 by internal friction
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Estadual de Ponta Grossa (UEPG)
ISSN: 
0921-5093
Abstract: 
The discovery of the spatial uniform coexistence of superconductivity and ferromagnetism in ruthenocuprates, RuSr2GdCu2O8 (Ru-1212), has spurred an extraordinary development in the study of the competition between magnetism and superconductivity. However, several points of their preparation process and characterization that determine their superconductive behaviour are still obscure. The improvement of sample preparation conditions involves some thermal treatments in inert atmosphere. Anelastic spectroscopy measurements were made using an inverted torsion pendulum, operating with an oscillation frequency of 38 Hz, temperature in the 90 and 310 K range, heating rate of 1 K/min, and vacuum better than 10(-3) Pa. The results show anelastic relaxation peaks at 210 K related to the presence of interstitial oxygen atoms. The peaks decrease significantly with the oxygen loss caused by the heat treatments in vacuum, appearing again after the annealing of the sample in an oxygen atmosphere. These observed peaks are clearly related to the additional oxygen atoms, with activation energy 0.13 and 0.36 eV, and can be explained in terms by diffusional jumps of interstitial oxygen in the RuO2 planes. (C) 2009 Elsevier B.V. All rights reserved.
Issue Date: 
25-Sep-2009
Citation: 
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. Lausanne: Elsevier B.V. Sa, v. 521-22, p. 84-86, 2009.
Time Duration: 
84-86
Publisher: 
Elsevier B.V. Sa
Keywords: 
  • Anelastic spectroscopy
  • Ru-1212
  • Torsion pendulum
  • Oxygen mobility
Source: 
http://dx.doi.org/10.1016/j.msea.2008.09.124
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/8422
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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