Microstructure near 2 1 1 phase in high Jc MTG YBCO |
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Authors: | Li Laifeng Zhang Zhong Jin Duo |
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Affiliation: | (1) Cryogenic Laboratory, Chinese Academy of Sciences, P. O. Box 2711, 100080 Beijing, China |
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Abstract: | The microstructures of MTG YBCO near 2 1 1 phase clusters inside the sample are studied by means of transmission electron microscopy. The results indicate that crystal defects around 2 1 1 phase are closely related to the distance between 2 1 1 particles (d
2 1 1). With the decrease ofd
2 1 1, the twin spacing increases. Simultaneously, the thickness of the twin boundary decreases. Whend
2 1 1 is less than 0.51 m, there are almost no defects between 2 1 1 particles. According to the established crack model, the mechanism of the appearance of a defect-free-zone is explained. The relationship betweend
2 1 1 and Jc is discussed in this paper. |
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