DIFFUSION-MODEL FOR THE CRYSTAL-GROWTH OF PR1-XCU3O7-DELTA BY THE TOPSEEDED CRYSTAL PULLING METHOD(XBA2)

A solidification model for Pr1+xBa2-xCU3O7-delta ternary oxides by the top seeded crystal pulling (SRL-CP: Solute Rich Liquid-Crystal Pullin g) method is presented in which the composition of the grown single cr ystals is estimated from the starting composition in the crucible. Thi s model involves the diffusion flux balance of each element at the gro wth interface in the liquid considering equilibrium tie-lines in the P rOy-BaO-CuO ternary phase diagram which have been obtained experimenta lly, The self-diffusion coefficient for Pr and the interdiffusivities for Pa and Cu in the liquid are used in this model because this liquid is a dilute solution for Pr. The calculated results are in good agree ment with the experimental ones.