An x-ray diffraction and SEM study of the effect of excess CaCO3, CaO and CuO on the stability of Bi-2212 phase
Abstract
The properties of the BSCCO superconductors depend strongly on the sintering temperature, time and composition. We have examined the effect of adding CaCO3-CuO and CaO-CuO on previously synthesized Bi-2212 precursor. CaCO3 and CuO powders were ground with the original 2212 precursor, pelletized and sintered at 845°C and 855°C for 75 hours and at 850°C for 50 hours. CaO and CuO were added to the original 2212 precursor, powdered, pelletized and sintered at 830°C, 840°C and 860°C for 100 hours. The composition of the sintered pellets was determined using x-ray diffraction. SEM micrographs of the samples were obtained. The sintered pellets consisted almost entirely of Bi-2212 phase, CaCuO3 and CuO. The addition of CaCO3-CuO and CaO-CuO stabilized the Bi-2212 phase. The compound CaCuO3 that resulted from this addition promoted the stabilization of Bi-2212.
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