Paper Title:
Oxygen Diffusion in Superconducting Oxides
  Abstract

Since the discovery of high-temperature superconductivity of cuprate oxides, it has been clear that it is strongly affected by the oxygen content, which is also a crucial factor to determine other physical properties of high Tc superconductors. Non-stoichiometric (interstitial) oxygen strongly influences the physical properties of various superconducting oxides, in particular by creating conducting holes. It is now ascertained that the amount of holes injected depends not only on the content of interstitial oxygen, but also on its ordering. Rearrangement of the oxygen ordering may occur even below room temperature due to the unusual high mobility of these atoms. This way, mechanical spectroscopy is one of the most adequate techniques for the study of the mobility (diffusion) of oxygen atoms. This technique allows the determination of the jump frequency of an atomic species precisely, regardless of the model or the different possible types of jumps. In order to evaluate the mobility and the effect of oxygen content on these oxides, ceramic samples we prepared and submitted to several oxygen removal cycles alternately with mechanical relaxation measurements. As for SBCO, it was assumed that the peak was due to O(1)-O(5) jumps of oxygen atoms at the chain terminals or in chain fragments in the orthorhombic phase. In the case of BSCCO, the results showed complex anelastic relaxation structures, which were attributed to interstitial oxygen atom jumps between two adjacent CuO planes.

  Info
Periodical
Defect and Diffusion Forum (Volumes 273-276)
Edited by
Andreas Öchsner and Graeme E. Murch
Pages
266-270
DOI
10.4028/www.scientific.net/DDF.273-276.266
Citation
C. R. Grandini, J. M. de Albuquerque Gimenez, M. R. da Silva, R. M. do Nascimento, "Oxygen Diffusion in Superconducting Oxides", Defect and Diffusion Forum, Vols. 273-276, pp. 266-270, 2008
Online since
February 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Armando Cirilo Souza, Carlos Roberto Grandini, Odila Florêncio
Abstract:The scientific and technological development in the area of new materials contributed to several applications of niobium and its alloys in...
261
Authors: Carlos Roberto Grandini, Luciano Henrique de Almeida, Renata Abdallah Nogueira, Terlize Cristina Niemeyer
Abstract:Titanium alloys are excellent implant materials for orthopedic applications due to their desirable properties, such as good corrosion...
30
Authors: Carlos Roberto Grandini, Emerson Haruiti Kamimura, José Roberto Severino Martins, Hugo Ricardo Zschommler Sandim, Odila Florêncio
Abstract:Metals with a bcc crystalline structure such as Ti-13V-11Cr-3Al alloys have their physical properties significantly changed through the...
38
Authors: Carlos Roberto Grandini, Luciano Henrique de Almeida, Durval Rodrigues Júnior
Abstract:When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they...
1228
Authors: Carlos Roberto Grandini, Odila Florêncio, Walter José Botta Filho
Abstract:The mechanical properties of metals with a body-centered cubic (bcc) structure, such as Nb, Ta, V, and their alloys, are modified with the...
708