X-Ray and High-Resolution Neutron Diffraction Studies on Nd (x) Y1-x Ba2Cu3O7-delta Superconductors

作者：Suharta W G^*; Mugirahardjo H; Pratapa S; Darminto D; Suasmoro S

来源：Journal of Superconductivity and Novel Magnetism, 2013, 26(11): 3209-3214.

DOI：10.1007/s10948-013-2177-5

• YBCO superconductor
• Dissolved method
• X-ray and high-resolution neutron powder diffraction
• Structure
• dc-susceptibility

A synthesis of neodymium-substituted YBCO superconductor Nd (x) Y1-x Ba2Cu3O7-delta (x=0,0.25,0.5,0.75,1) has been done using a dissolved method in order to obtain homogeneous crystals and higher critical current density. The effects of the substitutions on the structural and magnetic properties of the superconductors after sintering at 970 C-a similar to have been examined. Crystallinity of the synthesized powders was confirmed using X-ray and high-resolution neutron diffraction (XRD and HRPD) techniques. Rietveld analyses for both diffraction data sets gave increasing lattice parameters with addition of Nd content and decreasing orthorhombicity. Such addition also caused a decrease in occupancy of the oxygen in the O(4) site. Further investigation using SQUID showed critical temperature of the superconductors between 90.9 and 92.0 K. The critical current density (J (c) ) was calculated from the magnetic hysteretic loop at 5 K as 40 kA cm(-2) for Nd0.25Y0.75Ba2Cu3O7-delta sample and 100 kA cm(-2) for Nd0.5Y0.5Ba2Cu3O7-delta sample. We also found that increasing Nd content on the Nd (x) Y1-x Ba2Cu3O7-delta superconductor samples can improve their resilience of superconductivity and critical current density.

• 出版日期2013-11