Abstract
Phase decomposition in high-quality Bi2Sr2CaCu2Oy single crystals has been induced by annealing treatments at a temperature over 500 °C. X-ray diffraction and scanning electron microscope studies show that this change of structure is mainly limited in the surface part of the annealed single crystals and the 2201 phase together with a new phase of cell parameter c=9.6 Å segregated from the 2212 phase. The phase decomposition is directly associated with the oxygen content in the annealing atmospheres and evaporation of the Bi is detected and is suggested to be the main factor involving the phase segregation in the annealing process and an important factor for the BiO bilayers in the as-grown single crystals.
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