Title: Texture induced by uniaxial pressure in the YBa₂Cu₃0_7-y compound

Authors: Tian-Shyng Heh, Jiann-Ruey Chen, Tseung-Yuen Tseng

Addresses: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan, Republic of China. ' Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan, Republic of China. ' Institute of Electronics, National Chiao Tung University, Hsinchu 30039, Taiwan, Republic of China

Abstract: After uniaxial powder pressing under sufficient pressure, the green compacts of the YBa₂Cu₃0_7-y (YBCO) compound revealed strong degree of texture with the c-axis preferentially parallel to the press axis. After sintering in air at 950°C for 3 hr, freshly ground powder compacts still remain high degree of preferred orientation, while the pellets compacted from the milled and dried powders almost lost their texturing. There are two kinds of mechanism to induce texture by uniaxial powder pressing. One is the mechanical deformation, and the other is related to the pressureinduced grain alignment in the powder state. The latter may be one kind of the uniaxial piezoelectric effect

Keywords: YBCO compounds; perovskite-type high-Tc superconductor; uniaxial powder pressing; textured microstructure; preferred orientation; pressure-induced grain alignment; superconducting materials; mechanical deformation.

DOI: 10.1504/IJMPT.1993.036551

International Journal of Materials and Product Technology, 1993 Vol.8 No.2/3/4, pp.402 - 408

Published online: 04 Nov 2010 *

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