Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-485-C8-488
The Internal Friction Peaks in YBa2Cu3O6+x Above Room temperature Mark the Phase Transformations of the SystemE. Bonetti, E.G. Campari and N. Barbagallo
Dipartimento di Fisica Università di Bologna and Istituto Nazionale per la Fisica della Materia, viale Berti-Pichat 6/2, 40127 Bologna, Italy
the YBa2Cu3O6+x, system exhibits internal friction peaks above room temperature. These peaks are thermally activated. When the system is fully oxygenated (x=l), one peak only is detected. At a lower oxygen content, x<0.8, this peak change in shape and position and a new one can be contemporarily detected. These peaks are reasonably linked with the crystal phases of the system. We present a sequence of measures taken on the same sample, where the evolution of these peaks is shown.
© EDP Sciences 1996