Superconducting thallium oxide and mercury oxide films

• Published in: Physica. C, Superconductivity Vol. 377; no. 3; pp. 327 - 332
• Main Authors: Bhattacharya, R.N, Xing, Z, Wu, J.Z, Chen, J, Yang, S.X, Ren, Z.F, Blaugher, R.D
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-09-2002
• Subjects: Mercury oxide; Superconductors; Thallium oxide; Thallium oxide; Superconductors; Mercury oxide
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/S0921-4534(01)01284-9

This paper reports on a study to convert electrodeposited Tl-oxide films to Hg-1212 using the cation-exchange process. A two-layer electrodeposition process was used to prepare Tl–Ba–Ca–Cu–O films with Tl-1212 and Tl-2212 stoichiometry. Electrodeposited Tl-films were also deposited with Bi and Sr substituted for the Tl and Ba, respectively and also reacted using cation exchange to attempt formation of Hg-1212. The superconducting transition temperature for the “non-substituted” films improved from 97 to 120 K after the cation-exchange process with a critical current density exceeding 2×10
6 at 5 K in zero field. The cation-exchange process for the Bi, Sr substituted films appears to be more difficult with no marked improvement in superconducting properties.