Comparison of Bi-rich and Cu-rich oxides of the Bi-2212 phase

✍ Scribed by Yasushi Idemoto; Takako Toda; Kazuo Fueki

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 652 KB
• Volume: 249
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00290-1

✦ Synopsis

A single phase of Bi-rich Bi2.o6Sr2.o3Cao.98Cul.98Oy was prepared, and the oxygen nonstoichiometry Ay, critical temperature Tc and low-and high-temperature conductivities or were determined. The results were compared to those of the Cu-rich 2212 phase. Bi-rich oxide has shown a narrower Ay than Cu-rich oxide. The high-temperature conductivity of Bi-rich oxide was found to increase with the excess oxygen content Ay, as in the case of Cu-rich oxide. It was also shown that oxygen overdoping resulted from quenching samples highly doped with oxygen. Assuming that one excess oxygen atom creates two holes, the carrier density was calculated to be 1.