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vol.51 issue319A new method to determine open porosity and permeability constants of open-pore sintered glasses by photoacoustic techniqueSintering and second phase assignments in the SnO2-ZnO system author indexsubject indexarticles search
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Cerâmica

Print version ISSN 0366-6913On-line version ISSN 1678-4553

Abstract

NASCIMENTO, R. M.; GRANDINI, C. R.; GIMENEZ, J. M. A.  and  CUNHA, A. G. da. Mobility of interstitial oxygen in SmBa2Cu3O7-d ceramics. Cerâmica [online]. 2005, vol.51, n.319, pp.265-268. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132005000300014.

Since the discovery of the high-Tc superconductors, several works have been made about the different properties of these materials. The YBa2Cu3O7-d ceramic showed to have its superconducting properties strongly affected by the oxygen content. More recently, anelastic relaxation measurements in La2CuO4+d, showed that the removal of this element can be related to two events. One is the decrease in mobility between two adjacent CuO planes, and the other is the increase in the number of tilting patterns of the CuO6 octahedra. For SmBa2Cu3O7 (SBCO), the possibility of variable stoichiometry and the high mobility of oxygen in the CuOx planes give rise to a rich phase diagram. In this paper, anelastic spectroscopy measurements are reported in SBCO samples which shown a thermally activated relaxation peak that was attributed to the jumps of the oxygen atoms in the inter-chains O1 and O5 of the lattice.

Keywords : interstitial oxygen; SBCO oxides; superconductor ceramics.

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