|
|||||
|
|
Microstructures in Tl-1223/Ag tapes with different chemical compositions and Jc's |
|
| Authors: | D Y Jeong H K Kim Y C Kim B J Kim H S Lee T Tsuruta Y Matsui S Horiuchi |
| Institution: | a Korea Electrotechnology Research Institute, Changwon 641-120, South Korea b Department of Physics, Pusan National University, Pusan 609-735, South Korea c Department of Physics, Changwon National University, Changwon 641-773, South Korea d National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki 305-0044, Japan |
| Abstract: | The microstructures of a Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3O9+δ/Ag tape (tape I) with Jc of 17,600 A/cm2 at 77 K and 0 T and three Tl0.8Pb0.2Bi0.2Sr1.8Ba0.2Ca2.2Cu3O9+δ/Ag tapes with Jc's of 9300 (tape II), 16,700 (tape III) and 25 200 A/cm2 (tape IV) prepared using the powder-in-tube method and an in-situ reaction method, were investigated using high-resolution transmission electron microscopy. In the tape preparation, an intermediate rolling process was incorporated during final heat-treatment for the last tape, but not for the rest of the tapes. Tl-1223 grains are in a thin plate-like shape. Tendency of directional grain-alignment increased in an order of tapes I, II, II and IV. In tape IV, Tl-1223 grains are clearly textured at least partly. In lattice defects, while stacking faults were prevalent in the former composition, dislocations and holes were frequently observed in the latter. Also impurity phases were appeared to be more abundant in the former than in the latter. The relationship between Jc and the microstructure in the tapes was explained in a term of grain-linking. |
| Keywords: | Tl-1223 Ag Jc |
| 本文献已被 ScienceDirect 等数据库收录！ | |