Investigation of the microstructure of a high-J<sub>c</sub> bulk Y-Ba-Cu-O superconductor
T X Lin; J L Zhang; H T Ren; Q He; L Xiao; D Yin; T X Lin; Dept. of Phys., Peking Univ., Beijing, China; J L Zhang; Dept. of Phys., Peking Univ., Beijing, China; H T Ren; Dept. of Phys., Peking Univ., Beijing, China; Q He; Dept. of Phys., Peking Univ., Beijing, China; L Xiao; Dept. of Phys., Peking Univ., Beijing, China; D Yin; Dept. of Phys., Peking Univ., Beijing, China
Журнал:
Journal of Physics: Condensed Matter
Дата:
1991-09-02
Аннотация:
In order to reveal the microstructural features of the recently developed high J<sub>c</sub> bulk YBCO material with T<sub>c</sub>=91.2 K, J<sub>c</sub>(77 K, 2 T)=2.38*10<sup>4</sup> A cm<sup>-2</sup>, large-area TEM specimens containing several grains were successfully prepared from this material by a new technique. The material has a strong (001) texture. Many grain boundaries are clean (001) small-angle twist boundaries showing large-area moire fringes in the micrographs which may be an essential cause of the improved critical current.
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