RBa_2Cu_3O_y(R=Y, Er, Ho, Dy)超伝導体の内部摩擦(<特集>セラミック材料)

概要

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The internal-friction(IF) of superconductor RBa_2Cu_3O_y(R=Y, Er, Ho and Dy) was measured by a torsional vibration method in the frequency range of 0.032-10 Hz.IF peaks were observed in the temperature range 410-520 K. The peak-temperatures were influenced by the kind of rare-earth ions in R-site as well as the measured frequencies. The relaxation process was characterized by an average activation enthalpy of H=1.17±0.05eV and a pre-exponential factor of log(τ_0)=-13.0±0.5 for YBa_Cu_3O_y, H=1.17±0.05eV and log(τ_0)=-13.0±0.6 for ErBa_2Cu_3O_y, H=1.24±・0.01eV and log(τ_0)=-14.2±0.1 for HoBa_2Cu_3O_y, H=1.17±0.03eV and log(τ_0)=-13.5±0.3 for DyBa_2Cu_3O_y, respectively. The relaxation time (τ) decreased with increasing the ionic radius of rare-earth ion in Re-site. The activation enthalpy, however, was little affected by the ionic radius of R-site cation in RBa_2Cu_3O_y.
社団法人日本材料学会の論文
1998-06-15