Crystallization of Bi₄Sr₃Ca₃Cu₄O_x glass at 472°C and 800°C for the different duration, studied by X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, differential scanning calorimetry, termogravimetric analysis and Fourier transform infrared spectroscopy is reported. Crystallization at the temperature 472°C leads to the formation of Bi₂Sr₂Cu₁O₆ phase. This phase forms granular structure with randomly distributed grains in the glassy matrix. It was found that oxygen needed for the crystallization of the Bi₂Sr₂Cu₁O₆ phase is taken from glassy matrix and involves a change in the valency state of copper ions from Cu⁺¹ to Cu²⁺ during crystallization. Annealing at 800ºC gives mainly Bi₂Sr₂Ca₁Cu₂O₈ phase. After 200 h of heat treatment at this temperature, Bi₂Sr₂Cu₁O₆ phase, Bi₂Sr₂Ca₂Cu₃O₁₀ phase and Cu₂O was also observed.

Keywords: glass, crystallized glass, glass-ceramics, annealing, crystallization processes, superconducting phases

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