Formation and mobility of oxygen vacancies in RuSr2GdCu2O8 (Articolo in rivista)

Type
Label
  • Formation and mobility of oxygen vacancies in RuSr2GdCu2O8 (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • F. Cordero, M. Ferretti, M.R. Cimberle and R. Masini (2003)
    Formation and mobility of oxygen vacancies in RuSr2GdCu2O8
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F. Cordero, M. Ferretti, M.R. Cimberle and R. Masini (literal)
Pagina inizio
  • 144519 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 67 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Formation and mobility of oxygen vacancies in RuSr2GdCu2O8 (literal)
Abstract
  • Oxygen vacancies are introduced in the RuO2 and possibly CuO2 planes of RuSr2GdCu2O8 by annealing in vacuum above 600 K. The diffusive jumps of the O vacancies are accompanied by a reorientation of the local distortion, and are probed by measuring the elastic energy loss and modulus versus temperature at 1-10 kHz. An intense acoustic absorption peak develops near 670 K at 1 kHz and finally stabilizes after heating up to 920 K in vacuum. The analysis of the peak shows a barrier for the O diffusion of ~1.4 eV, and a slowing down of Curie-Weiss type, with TC =400-470 K, due to the interaction among the O vacancies. A secondary peak is attributed to O vacancies trapped at defects in the RuO2 planes, or to vacancies in the CuO2 planes. No sign of structural phase transformation is found up to 920 K. (literal)
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