Abstract
Films of 80 K phase of BiCaSrCu-oxide superconductor referred as BCSCO have been grown from KCl-Bi2CaSr2Cu2O8+ϰ solutions at different growth temperature regimes by the LPE process. Twin-free single crystal substrates of NdGaO3 with (001) orientation are used for growing these films. The temperature range of 850-830°C is found to be the most favorable region for the formation of the 2122 phase of BCSCO. Above 850°C up to the peritectic melting point of the 2122 phase (885°C), formation of the 2122 phase is highly suppressed with the separation of Bi2CaSr2Cu2O8+ϰ into 2021, calcium copper oxide (Ca2CuO3 and CaCu2O3) and other non-superconducting phases. X-ray powder diffraction analysis is used to identify different phases of BCSCO films. Morphological examination of the films is carried out by scanning electron microscopy. The onset of transition of the 2122 phase films is observed at 90 K and zero resistance is reached at 83 K. Post-growth annealing has an adverse effect on the superconducting properties of the films.
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