Journal of Materials Science, Vol.32, No.21, 5679-5685, 1997
Synthesis of the Bi2Sr2Cacu2O8+delta Superconductor Following a Polymer Matrix Route
This paper presents a convenient polymer matrix synthesis route based on the use of metal acetates, which yields Bi2Sr2CaCu2O8+delta(2212 phase) with a T-c higher than 93 K, in air and within a short sintering time (6-12 h) at 855 degrees C. The phase quality of the intermediate and final products has been analysed by powder X-ray diffraction and scanning electron microscopy with energy-dispersive spectroscopy. Macroscopic superconducting characteristics have been determined by alternating-current magnetic susceptibility and direct-current magnetization. The results obtained on a targe number of samples suggest that this preparation route is highly reproducible and leads to black-grained powders with excellent homogeneity within a relatively short processing time. The usefulness of these powders to obtain textured superconducting products has been explored and representative results are presented here.