Abstract
(Bi0.8Pb0.2)4Sr3Ca3Cu4Ox glasses were obtained by a standard technique of quenching melted substrates. The glass–ceramic samples were produced by annealing of the glass at various temperatures between 700 and 865 °C. The evolution of the structure and microstructure of the material was studied by X-ray diffraction and scanning electron microscopy (SEM). Superconducting phases e.g. (Bi1−yPby)2Sr2Cu1Ox, (Bi0.8Pb0.2)2Sr2CaCu2Ox, (Bi0.8Pb0.2)2Sr2Ca2Cu3Ox and other oxides like Cu2O and CaO were detected. Quantitative analysis of the crystallisation of 2201 and 2212 phases was performed with the use of Rietveld refinement method. Kinetics of crystallisation process was discussed. We have considered the possibility of crystallisation of (Bi0.8Pb0.2)2Sr2CaCu2Ox by a transformation of other than 2201 phases. Comparison of solid state crystallisation processes in different conditions showed that the very first minutes of the processes are very important for the conducting and superconducting properties of the final material.
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