Chemical diffusion of oxygen in dense, textured (Bi,Pb)(2)Sr2Ca2Cu3Ox

Dense polycrystalline (Bi,Pb)(2)Sr2Ca2Cu3Oy specimens were fabricated by si nter forging. The specimens exhibited excellent phase purity and strong tex ture of c-axes, which were preferentially aligned parallel to the forging d irection. The chemical diffusion coefficient of oxygen, (D) over tilde, mea sured in pure O-2 could be represented as (D) over tilde(ab) approximate to 1.78 x 10(-3) exp(-0.96 eV/kT), where the subscript ab refers to diffusion within the a-b-plane. The measurements suggested that (D) over tilde(ab) > > (D) over tilde(c), where the subscript c refers to diffusion in the c-dir ection. (C) 1999 Published by Elsevier Science B.V. All rights reserved.