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 Al 2O3 were added to the samples under study. The Samples of high temperature superconductors 1 X (Bi2Ba2Ca2Cu3O10+ ) + X(Al2O3) with X= (0-0.9) were prepared by solid state reaction method under hydraulic pressure 8 ton/cm 2 and annealing temperature 800. Electrical properties of the samples showed that Tc increases from 12 6 K to 139 K, and also oxygen content in samples increased with increasing X values from 0 to 0.5, while T c d creased 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 wi th 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 heav ier elements, such as Bi and Cu , and light regi ons related to lighter elements , uch as Ba and Ca , depending on atomic weights