Internal oxidation in Bi2.1 – xPbxSr2 – yCa1 – zYy + zCu2O8 + d solid solutions
Abstract
The Bi2 – xPbxSr2CaCu2O8 + d solid solutions with the replacement of Sr or Ca by Y were prepared at 760–790 °C in a flow of nitrogen, oxidised in air under isothermal conditions and tested using XRD, TGA, chemical analysis, TEM and XANES.