Dense polycrystalline specimens were prepared by sinter forging. The specimens exhibited excellent phase purity and a strong c-axis texture which was preferentially aligned parallel to the forcing direction. The chemical diffusion coefficient of O, in a pure O atmosphere, could be described by:
D (cm2/s) = 1.78 x 10-3 exp[-0.96(eV)/kT]
on the ab-plane. The measurements suggested that these values were much higher than
those for diffusion in the c-axis direction.
Chemical Diffusion of Oxygen in Dense Textured (Bi,Pb)2Sr2Ca2Cu3O. J.H.Park, K.C.Goretta, N.Murayama: Physica C, 1999, 312[3-4], 269-73
Table 84
Diffusivity of O Ions in Sintered Cu3Ca2Bi2Sr2PbOx
Temperature (C) | D (cm2/s) |
500 | 4.08 x 10-10 |
550 | 1.27 x 10-9 |
600 | 3.34 x 10-9 |
650 | 9.11 x 10-9 |
700 | 2.06 x 10-8 |
750 | 3.65 x 10-8 |
800 | 6.38 x 10-8 |
810 | 8.89 x 10-8 |
820 | 1.11 x 10-7 |
830 | 1.38 x 10-7 |
840 | 1.86 x 10-7 |
850 | 2.03 x 10-7 |