Abstract
The crystallization of Bi2Sr2CuOx (Bi-2201) and Bi2Sr2CaCu2Ox (Bi-2212) from powdered Bi–Sr–Ca–Cu–O glasses having a composition of Bi2Sr2CaCu2Ox by annealing up to 600°C in air is investigated using a high-temperature X-ray diffraction apparatus with a rapid counting and analyzing system. The initial crystallization of the above two phases appears at the first stage within 5 min of heating and no further increase in the amount of Bi-2201 is observed. Between 500 and 600°C, the amount of Bi-2212 gradually increases with the soaking time after the initial rapid crystallization. The kinetic analyses of the data in this temperature range have revealed that an activation energy of 70.8 kJmol-1 is required for Bi-2212 crystallization, which may be controlled by oxidation of Cu(I) to Cu(II).
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