The Effect of Addition of (Al2O3) Nano Particles on Structural and Electrical Properties of Bi2Ba2Ca2Cu3O10" +δ" Superconductors at High Temperature

Abstract

To enhancement the superconductor structural characteristics, nanoparticles of the Al2O3 were added to the samples under study. The Samples of high temperature superconductors 1-X (Bi2Ba2Ca2Cu3O10+δ) + X(Al2O3) with X= (0-0.9) were prepared by solid state reaction method under hydraulic pressure 8 ton/cm2 and annealing temperature 800℃. Electrical properties of the samples showed that Tc increases from 126 K to 139 K, and also oxygen content in samples increased with increasing X values from 0 to 0.5, while Tc decreased less than 77 K with increasing X at values more than 0.5. In Structural properties, the X-ray diffraction of the samples showed orthorhombic phase with a=4.286A°, b=5.4184A°, c=35.3528A° at X=0, while c-value is increased to 35.9848A° at X=0.5. AFM results shows that the average grain size of the best sample was 47.67 nm at X=0.5. SEM it showed that there are dark regions related to the heavier elements, such as Bi and Cu, and light regions related to lighter elements, such as Ba and Ca, depending on atomic weights