Abstract Measurements of the elastic energy dissipation coefficient and of the dynamic Young modulus were performed on polycrystalline YBCO samples by the vibrating-reed technique and torsional pendulum, in the frequency range 5–5000 Hz. Two relaxational damping peaks with activation energy Ho1 = (1.5±0.1) eV and Ho2 = (1.3±0.1) eV have been observed above room temperature and their origin is discussed in terms of the short-range oxygen dynamics. The dynamic modulus shows a relaxation in correspondence to the two peaks and a softening attributed to the orthorhombic-to-tetragonal phase transition.
Bonetti, E., Campari, E., Mattioli, P., Zingaro, A. (1994). Stoichiometry dependence of oxygen anelastic relaxation in YBa2Cu3O7−χ and the orthorhombic-to-tetragonal phase transition. Elsevier [10.1016/0925-8388(94)90510-X].
Stoichiometry dependence of oxygen anelastic relaxation in YBa2Cu3O7−χ and the orthorhombic-to-tetragonal phase transition
Bonetti, E.
Primo
Conceptualization
;Campari, E. G.Secondo
Investigation
;Mattioli, P.Penultimo
Software
;
1994
Abstract
Abstract Measurements of the elastic energy dissipation coefficient and of the dynamic Young modulus were performed on polycrystalline YBCO samples by the vibrating-reed technique and torsional pendulum, in the frequency range 5–5000 Hz. Two relaxational damping peaks with activation energy Ho1 = (1.5±0.1) eV and Ho2 = (1.3±0.1) eV have been observed above room temperature and their origin is discussed in terms of the short-range oxygen dynamics. The dynamic modulus shows a relaxation in correspondence to the two peaks and a softening attributed to the orthorhombic-to-tetragonal phase transition.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
