Grain Growth, Alignment, and Properties of Bi-based Superconducting Materials
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Hot pressing effect on critical current density (J<SUB>c</SUB>) is studied on Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>x</SUB> (Bi-2212) superconducting materials. Hot pressing is effective to hasten the grain growth, align the grains, and improve the bulk density of the Bi-2212 materials. In consequence of hot pressing, J<SUB>c</SUB> increases by more than 10 times at 77K under zero magnetic field. Hot pressing effect is enhanced by incorporation of large single crystalline Bi-2212 whiskers. J<SUB>c</SUB> is 3. 1×10<SUP>3</SUP> A/cm<SUP>2</SUP>, which is about 8 times higher than that for the hot pressed Bi-2212 material without the whiskers, at 77K under zero magnetic field for the Bi-2212 whisker composite. This is due to the haste of grain growth and improvement of grain alignment around the whiskers.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1069-1071, 1998
The Japan Society of High Pressure Science and Technology