Growth of Bi-2212 single crystals by a vertical Bridgman method using large crucibles

✍ Scribed by Y. Echizen; H. Tanaka; S. Kishida

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 166 KB
• Volume: 426-431
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.05.021

✦ Synopsis

Bi 2 Sr 2 CaCu 2 O 8+d (Bi-2212) superconducting single crystals were prepared by a modified vertical Bridgman method using large crucibles of a 30 mm external diameter with a cone-shaped bottom. In order to obtain a large single crystal with high crystallinity, we optimized the growth conditions, where the large crucibles were used. As a result, we could obtain a large plate-like single crystal with a size of 17.0 • 5.5 mm 2 when the rotation speed of crucible and the starting temperature of melt for crystal growth were 50 rpm and 1000 °C, respectively. The full width at half maximum value of the (0 0 1 0) X-ray diffraction peak due to Bi-2212 was small with about 0.06°. Moreover, the critical temperature (T c ) of the single crystals was about 87 K, which was higher than the T c of the single crystals grown with the crucibles whose external diameter was by 30% smaller than that of the large crucibles.