The influence of Ag doping on structrual and electrical resistivity properties of Y<sub>3</sub>Ba<sub>5</sub>Cu<sub>8</sub>O<sub>18</sub> high temperature superconducting alloys

Abstract

This research paper describes the synthesis of a series of Y-based superconducting alloys doped with Ag oxide. The Y₃Ba₅Cu_{8–<em>x</em>}Ag<em>_x</em>O_18–_d superconducting alloys were synthesized by Gholipour et al. (2012), Tavana et al. (2010) and Khosroabadi et al. (2014) using sol-gel reaction technique. In the present research Y₃Ba₅Cu_{8–<em>x</em>}Ag<em>_x</em>O_18–_d superconducting alloys were synthesized by solid state reaction technique. These alloys were investigated by using X-ray diffraction pattern (XRD), Scanning Electron Microscope (SEM) image and the electrical resistivity, ρ, measurements. The ρ measurements above room temperature of Y358 alloys shows metal behavior in the normal state. The YBCO alloy family was exposed having the CuO₂ planes and the Cu-O chains. Increasing the number of the CuO₂ planes and the position of the Cu-O chains have positive effects on the significance of the transition temperature in the Y-based alloys. The X-ray diffraction patterns were accepted by Joint Committee of Powder Diffraction Standards (JCPDD) database software, which the Ag ions substitute in symmetrical phase of the alloy. The replacement of the Ag ions in the CuO₂ plane of symmetric phase has been associated with the Ag ions in the Y123 alloys, which replace in the Cu-O chain. The ρ of these alloys were measured employing four-probe point technique and the r(T) curves agreed the transition temperature develops above 100 K.