Synthesis of the high-temperature superconductors HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ

✍ Scribed by R.L. Meng; L. Beauvais; X.N. Zhang; Z.J. Huang; Y.Y. Sun; Y.Y. Xue; C.W. Chu

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 647 KB
• Volume: 216
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90629-5

✦ Synopsis

The newly-discovered homologous series HgBa&a._ r Cu 0 ,, 2n+2+6 [Hg-lZ(n-l)n] with n=l, 2, 3,... possesses the highest superconducting transition-temperature (T,) to date. Unfortunately, because of the complexity of its compound chemistry, it remains a challenge to prepare samples with pure or nearly-pure Hg-12 (n -1) n for both scientific and applied studies. In the present investigation, we report the successful development of a controlled vapor/solid reaction process for the synthesis of samples with up to 75 to 90% Hg-1212 and 65 to 75% Hg-1223 by volume, which display sharp superconducting transitions up to 135 K. Detailed steps of the process are presented and discussed.