Synthesizing and A studying of Structural, Optical, and Electrical properties of pure Yttrium Barium Copper Oxide and Doped with Aluminum Oxide at Room Temperature

Abstract

YBCO is a family of crystalline chemical compounds famous for displaying high-temperature superconductivity. The structural properties was studied by using X-ray powder diffraction (XRD), scanning electron microscope (SEM) and Fourier Transform Infrared (FT-IR). X-ray diffraction analysis showed that all samples have orthorhombic structures correspond to the high and low- phase with changing of the lattice parameters, and the crystal structure for pure YBa2Cu3O7 is found to confirm the phase formation. Scanning Electron Microscope (SEM) pictures show uniform and homogeneous distribution, and the effect of the doping of aluminum oxide to the composite samples decreases the grains of the image of the distortion in the shape and structure. Fourier Transform Infrared spectrum showed that the YBa2Cu3O7 is pure, and YBa2Cu3O7 which doped with AL2O3 revealed perfectly. The optical properties for pure YBa2Cu3O7 and YBa2Cu3O7 which doped with AL2O3 was studied by using Ultraviolet-Visible Spectrophotometry (UV/VIS), the transmittance and absorbance spectra were recorded include the wavelength range of (200-800)nm, the results showed that Transmittance decreases with increasing in the wavelength between (200- 300) nm, and then remains constant with increasing wavelength, and absorbance increased with increasing wavelength between (200- 300) nm, and then remains constant with increasing the wavelength, and the Absorption Coefficient, refractive index and extinction coefficient were also calculated. The optical energy gap decreases with increase the doping with YBa2Cu3O7 which doped with AL2O3, and also optical conductivity increases with elevated on absorbance. The electrical properties studied by using (I-V) measurements, also subjected our sample for (I-V) V characterization at different sample through four probe method and able to measure the critical current density (Jc) and found a decrement of critical current density with increment of doping, where electrical conductivity was calculated, the results also showed that The electrical conductivity for pure YBa2Cu3O7 and YBa2Cu3O7 doped with AL2O3 its increase with increased the doping concentration.