Study of the Effect of partial substitution on the structural and electrical properties of (YBCO) Superconducting System

Abstract

The purpose of this study is to find out the optimal substitution ratio for Indium with yttrium through the structural and electrical properties of the prepared compounds. The superconductor compound (Y1−xInxBa2Cu2.85La0.15O6+δ) was prepared by the solid state reaction (SSR) method. The effect of partial substitution for the Indium on the compound's structural characteristics has been studied The variation of (x) is (0, 0.05, 0.1, 0.15, 0.20, 0.25). With a pressure of 7 tons per square centimeter, the combined powder was formed into a disc with a thickness of (about 0.2 cm). The samples were sintered for a while (24 hours)at a rate that changed from room temperature to (820°C). Based on (XRD) study All samples were discovered to contain an orthorhombic structure. It was established that variations in the lead concentrations in each of our samples result in variations in parameters for a lattice (a,b,c),(c/a), dm, Tc, and energy gap. Where its best values were recorded at a concentration (x = 0.05), where the values of the lattice constants in angstrom units (a, b, c) were (3.883388, 3.877665, and 11.65027) respectively, the highest value for (Tc) was (116.2). The density value (dm) is (6.34631683), Vph(H) was (90.91), the highest percentage was (c/a =3.000029) and the highest energy gap was (Eg = 0.035077875 eV), so we can consider it the optimal replacement ratio under the conditions of this work. (FESEM and AFM) were used to analyze microscopic pictures of the compounds prepared with different substitution ratios in addition to the pure sample at very high magnifications at a degree of magnification (5μm,200nm).