Interdiffusion of rare-earth cations in Ln1−x′Lnx″ Ba2Cu3O7 − δ (Ln′, Ln″ = Y, Dy, Ho) High-Tc superconductors

The Y3+/Ho3+, Y3+/Dy3+, and Dy3+/Ho3+ interdiffusion coefficients in the YBa2Cu3O7 − δ-HoBa2Cu3O7 − δ, YBa2Cu3O7 − δ-DyBa2Cu3O7 − δ, and DyBa2Cu3O7 − δ-HoBa2Cu3O7 − δ systems have been determined in air at a temperature of 1233 K by the Boltzmann-Matano method from the yttrium/holmium, yttrium/dysprosium, and dysprosium/holmium concentration profiles across the diffusion zone between two pellets of the high-T c superconductors. The composition dependences of the interdiffusion coefficients in the solid-solution systems are presented.