Superconducting thallium oxide films via an electro-deposited precursor

OVERVIEW ON THE ELECTROCHEMICAL DEPOSITION OF Bi-2212 FILMS

“…At the end of the regular deposition process as reported in ref. [5], the morphology of the deposited film, shown in the SEM micrograph of Figure 2, reveals the presence of large non superconducting alkaline earth cuprates (AEC) that, according to their composition determined by microprobe analysis, can be identified as AEC(14,24)=(Sr, Ca) 14 Cu 24 0 41 . The influence of the AEC on the Bi-2212 quality concerns two main aspects: the unbalancing of the overall chemical composition of the deposit and the structural disorientation of the Bi-2212 platelets with respect to their preferred planar stacking with the c-axis perpendicular to the substrate surface.…”

“…One of the major impediment is the very low reduction electrochemical potential (much lower with respect to the water hydrolysis potential) of key elements, like Sr, Ca, Ba, Y, present in the superconducting crystalline lattice of the most interesting compounds. The use of organic electrolytes and careful choices of the electrodeposition sequence (either via multielement codeposition or via sequential deposition of elements with intermediate thermal treatments) brought substantial improvements in a few years in this kind of superconducting coated tapes, especially of the Bi-and the Tl-based compounds [4,5]. We will present our recent advancements on the electrodeposition of the Bi-2212 phase on silver tape, a model system which can be considered, at present, as one of the most interesting low cost alternative to the powder in tube tape technology.…”

SnO2:F coated ferritic stainless steels for PEM fuel cell bipolar plates

“…A standard solution, containing 100 ppm of each of the metal ions in 1 M H 2 SO 4 , was purchased from Inorganic Ventures, Inc. The estimated relative uncertainty for ICP analysis, mainly due to variability in the plasma, pump rate, and nebulizer efficiency, is 5% [12].…”

Electrochemical Synthesis of Metal Oxides and Hydroxides

“…Alloy/Metal Deposition by Cathodic Reduction. Superconducting films of different oxide systems such as YBaCuO,85a ErBaCuO,85b TlBaCaCuO, 85c, and BiSrCaCuO 87 have been synthesized by cathodic reduction of a mixture of metal nitrates in a nonaqueous (DMSO) bath. Cathodic reduction results in the formation of an alloy precursor film with metals in the required ratio.…”