Preparation of the Compound (Y1−xPbxBa2Cu2.85La0.15O6+δ) Superconductor and Research of the Impact of Partial Substitution on the Structural Properties

Abstract

The purpose of this study is to find out the optimal substitution ratio for lead with yttrium through the structural properties of the prepared compounds. The superconductor compound (Y1−xPbxBa2Cu2.85La0.15O6+δ) was prepared by the solid state reaction (SSR) method. The effect of partial substitution for the lead 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 (27°C) to (850°C). Based on the X-ray diffraction (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. Its best values were recorded at a concentration (x = 0.1), where the values of the lattice constants in angstrom units (a, b, c) were (3.807346, 3.886549, and 11.70871) respectively, the highest value for (Tc) was (112.1). The density value (dm) was (6.42604 gm/cm3), the highest percentage was (c/a =3.075295) and the highest energy gap was (Eg = 0.03384 eV). So, it can be considered the optimal replacement ratio under the conditions of this work. Scanning electron microscopy(SEM) was used to analyze microscopic pictures of the compounds prepared with different substitution ratios in addition to the pure sample at very high magnifications (SEM) at a degree of magnification (5μm,200nm).

Received 29/12/2022

Revised 10/07/2023

Accepted 12/07/2023

Published Online First 20/07/2024