Transfer of mass in the growth of Y₁Ba₂Cu₃O₇  +Y₂BaCuO₅pseudo-crystals by a top-seeded growth process

Abstract

Textured Y 1 Ba 2 Cu 3 O 7−δ +Y 2 BaCuO 5 pseudo-crystals were grown by the partial melting method. The thermocapillary effect on the deviation of the stoichiometry of Y 1 Ba 2 Cu 3 O 7−δ +Y 2 BaCuO 5 bar samples during the partial melting process is shown. The hydrodynamic equation describing the mechanism of transfer of the BaCuO 2 and CuO phases in the pores of samples is proposed. The coefficient of Y 2 BaCuO 5 diffusion into the liquid BaCuO 2 +CuO phases is determined.

10.1007/s11455-008-1002-1

“…During the crystallization, separate oxygen atoms are condensed to form pores, which are displaced toward the boundaries of crystal blocks. The concentration of pores at these boundaries increases with the dimensions of crystal blocks [7]. In the presence of a radial temperature gradient, pores are also removed via the hot side surface of the rod.…”