S. Qayyum, S. K. Durrani, J. Akhtar, A. H. Qureshi, M. Arif, M. Ahmed, S. Rahman


The sol spray process (modified form of sol gel) has been used to prepare Bi-Sr-Ca-Cu-O (BSCCO) homogeneous
powder. In sol spray process, the prepared sol solutions have been dehydrated directly into BSCCO ceramic powder by
spraying into a preheated temperature controlled pyrex glass column by means of compressed air atomization without
the addition of organic chelating agent or organic templates. The prepared BSCCO material was characterized by
thermogravimetric (TG), differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy
(SEM) techniques. Elemental compositions of BSCCO oxide powder and calcined pellet were verified by inductively
coupled plasma emission spectrometer (ICP-OES) and electron probe micro analyzer (EPMA) attached with SEM. The
results of these techniques were compared and correlated statistically. Student t-test and variance ratio test (F-test)
were performed for the significance of results by analysis of variance (ANOVA). The dependence of electrical resistance
versus temperature was recorded by classical four probe technique. It has been observed that sol spray process did
affect the physico-chemical properties of BSCCO superconductor oxide. The superconducting phase identified by above
mentioned techniques mainly shows the higher %age of low Tc phase Bi2Sr2CaCu2O8 (2212) with transition temperature
of 85 K.

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