Physical Properties of $(\hbox {BaSnO}_{3})_\mathrm{x}/\hbox {Cu}_{0.5}\hbox {Tl}_{0.5}\hbox {Ba}_{2}\hbox {Ca}_{2}\hbox {Cu}_{3}\hbox {O}_{10{-}\delta }$ Superconductor Composite

Abstract

The influence of barium tin oxide nanoparticles addition on the structural and superconducting properties of the $\hbox {Cu}_{0.5}\hbox {Tl}_{0.5}\hbox {Ba}_{2}\hbox {Ca}_{2}\hbox {Cu}_{3}\hbox {O}_{10{-}\delta }$ phase, (CuTl)-1223, was studied. A different wt% of $\hbox {BaSnO}_{3}$, ranging from 0.00 to 1.50, were added into (CuTl)-1223 phase, and this composite was synthesized using the solid-state reaction technique. The phase formation and lattice parameters were calculated from X-ray powder diffraction measurements. The grain connectivity and surface morphology were identified using scanning electron microscope. Energy dispersive X-ray spectroscopy gave the real elemental composition of the prepared samples. Superconducting transition temperature $({T_\mathrm{c}})$ and critical current density $({J_\mathrm{c}})$ were determined from the electrical resistivity and I–V measurements, respectively. A complete study about the vibration modes of different atoms was carried out using Fourier transform infrared (FTIR) absorption spectroscopy of $(\hbox {BaSnO}_{3})_\mathrm{x}/\hbox {CuTl-1223}$ composite. The increase in ${T_\mathrm{c}}$ and ${J_\mathrm{c}}$ up to $x=0.25$ wt% is an evidence for improving the superconducting properties of $(\hbox {BaSnO}_{3})_\mathrm{x}/\hbox {CuTl-1223}$ composites by enhancing both the inter-grains coupling and volume fraction of the (CuTl)-1223 phase.