Open AccessQUASI-HYDROSTAT1CALLY COLD-PRESSED Bi0.8Pb0.2SrCaCu2Ox SUPERCONDUCTORS
Author(s) -
Wu Bing-Qing,
Wenkui Wang,
Changqing Jin,
Wei Liu,
Fanghua Li,
Shichao Liu,
Zhenxing Li,
Zhao Zhongxian,
Yonghong Yao
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.1993
Subject(s) - hydrostatic pressure , superconductivity , annealing (glass) , materials science , condensed matter physics , hydrostatic equilibrium , shear stress , composite material , thermodynamics , physics , quantum mechanics
The effects of quasi-hydrostatic pressure treatments on the Bi-system superconductors were investigated The cold-pressing treatments seriously weakened the inter-granular weaklinks and induced a large number of intragranular defects, resulting in the deterioration of the suprcon-ducting properties. The targe increase in the bulk density and the orientation of the superconducting grains were also observed in the cold-pressed samples. These drastic changes of superconductivity were mainly due to the shear stress under quasi-hydrostatic pressure. The post annealing treatments greatly enhanced the weaklinks and caused the partial recovery and the agglomeration of some defects. By coldpressing-annealing method, Jc (77 K, zero field) was raised to about 1600A/cm2. The pressure dependence of Tc under hydrostatic pressure was also investigated and dTc/dp was found to be 1.4K/GPa.