Effect of Yb substitution in Bi-2212 ceramics prepared by laser floating zone technique

Abstract

In the present work, the influence of Yb substitution for Bi on the structural, electrical and magnetic properties of textured Bi-2212 ceramics has been investigated. X-ray diffraction studies indicated that the major peaks correspond to the Bi-2212 phase. The SEM images clearly show that there is an increase in the number of secondary phases with raising Yb content while all samples maintain similar grain morphology. Magnetic analysis of all samples has been done by magnetic hysteresis measurements, indicating that an enhancement in the M-H loops is obtained by a low Yb doping. The critical current density of samples was calculated from the M-H curves by using Bean's critical state model, indicating that sample with 0.05 Yb substitution possesses the highest J c values.

Physical, electrical and magnetic properties of Cr doped Bi2Sr2Ca1Cu2−xCrxOy (Bi-2212) superconductors prepared by laser floating zone technique

“…The green ceramics were subsequently grown at 15 mm/h in a LFZ system using 18 rpm relative rotation between the seed and feed. Texturing conditions were selected according to previous works [39,40].…”