A two-step process is proposed for the formation of c-axis aligned (Bi,Pb)2Sr2Ca2Cu3O10+δ [Bi(2:2:2:3)] platelets in a silver sheath. The process involves: (1) the formation of c-axis aligned (Bi,Pb)2Sr2CaCu2O8+δ at early stage of heat treatment and (2) the subsequent intercalation of Ca–Cu–O layers to form Bi(2:2:2:3). This is based on the measurements of (1) the rocking curves for c-axis alignment and the two theta scans for the Bi(2:2:2:3) conversion ratio, both by a transmission x-ray technique, and (2) a quantitative study of the phase conversion due to intercalation of Ca–Cu–O layers into existing Bi(2:2:1:2) by transmission electron microscopy.
Highly textured (c axis perpendicular to the plane of the substrate tape) thick films of YBa2Cu3O7 grown on Ag0.9Pd0.1 and pure silver substrates have been made by a traveling heated zone method. The speed of the traveling zone can be as fast as ∼5 cm/h and the temperatures of the zone, 930–975 °C, were well below the peritectic temperature of YBa2Cu3O7. A precursor layer, which consisted of a nitrate solution of yttrium, barium, and copper cations, was deposited by spray pyrolysis directly onto a heated substrate. The values of the resistively measured Tc were 83–91 K. The transport critical current density of these thick films was in the range of 2–8×103 A/cm2 at 77 K and 0 T.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.