Characterization of YBa2Cu3O7−x bulk samples prepared by citrate synthesis and solid-state reaction

Abstract

YBa2Cu3O7−x bulk samples made by citrate synthesis and pyrolysis are characterized and compared with samples made by solid-state reaction. Calcination at 830 °C followed by sintering at 950 °C of samples made of pyrolyzed powder gives pellets with quite good superconducting properties. They are very dense (6.06 g/cm3) and have a specific heat jump of 4 J/mol K at 91 K. X-ray diffraction shows a strong c-axis orientation, scanning electron microscope, and energy dispersive x-ray spectroscopy show a homogeneous structure and composition for these kinds of samples.

Modified Pechini Synthesis of Oxide Powders and Thin Films

“…In addition to the modified Pechini routes, there are also several reports on amorphous citratesyntheses to prepare YBCO (Yang et al 1989) without the use of EG. Also oxalic acid has been used as the complexing agent (Sanjines et al 1988).…”

Modified Pechini Synthesis of Oxide Powders and Thin Films

“…In addition to the modified Pechini routes, there are also several reports on amorphous citratesyntheses to prepare YBCO (Yang et al 1989) without the use of EG. Also oxalic acid has been used as the complexing agent (Sanjines et al 1988).…”