Formation and texture of Bi-2223 phase during sintering in a temperature gradient

✍ Scribed by X.Y. Lu; A. Nagata; K. Watanabe; T. Nojima; K. Sugawara; S. Hanada; S. Kamada

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 513 KB
• Volume: 412-414
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.01.080

✦ Synopsis

The formation and texture of Bi-2223 phase during sintering in a temperature gradient were investigated. Co-precipitated powders with the composition of Bi:Pb:Sr:Ca:Cu ¼ 1.85:0.35:1.90:2.05:3.05 were used. Samples set on a silver holder were sintered at 850 °C for 120 h in a vertical tube furnace with a temperature gradient of 15 °C/cm installed in a solenoid-type superconducting magnet. A vertical magnetic field can be applied parallel to the long axis of the furnace. It has been found that the Bi-2223 grains with their c-axis parallel to the axial direction of the vertical tube furnace are formed not only on the surface, but also in the center of the sample sintered at 850 °C for 120 h in 15 °C/cm temperature gradient without magnetic field. Moreover, the sample sintered in the temperature gradient and in a 10 T magnetic field have a stronger c-axis alignment of Bi-2223 phase. It is suggested that both the temperature gradient and magnetic field during sintering are favorable for the c-axis alignment of Bi-2223 phase.