PHASE-TRANSITION TOUGHENING OF HIGH-TC SUPERCONDUCTING CERAMICS

被引：7
|
作者：
SIU, GG [1 ]
ZENG, WG [1 ]
机构：
[1] INST TECHNOL, GUANGDONG 511700, PEOPLES R CHINA
来源：
JOURNAL OF MATERIALS SCIENCE | 1993年 / 28卷 / 21期
关键词：
D O I：
10.1007/BF00365195
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of the superconducting transition (SCT) on the plane-strain fracture toughness K1c of YBCO and BSCCO is studied by the method of three-point bend loading at room temperature and at 77 K. Toughening is observed and related to variation of the Gibbs free energy through the SCT, and hence to the condensation energy of a Cooper-pair gas. This is explained by the additional energy needed to excite superconducting electrons to normal ones in crack surfaces owing to magnetic field penetration. The superconducting gap parameters of YBCO and BSCCO are estimated and the results are reasonable.
引用
收藏
页码：5875 / 5879
页数：5
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