Effect of Ce substitution on structural and superconducting properties of Bi-2212 system

Abstract

In this study, Bi 2 Sr 2 Ca 1-x Ce x Cu 2 O y , where x = 0, 0.01, 0.05, 0.1 and 0.25, superconducting samples were prepared by solid state method and subsequently used as feed in a directional solidification process. The physical properties of the samples were investigated by powder X-ray diffraction, scanning electron microscopy (SEM), dcelectrical resistance, magnetization, and magnetic-hysteresis loops measurements. It has been found that no significant difference has been observed in the critical transition temperatures of samples except for the sample with the highest Ce additions, which shows the lowest T c compared with the other doped samples. Magnetic hysteresis measurements have shown that the hysteresis loop is greater than the doped samples. In addition, critical current density values obtained from the hysteresis loops measurements by using Bean's critical state model show a decrease with Ce-addition. All the results indicate that Cerium substitution for Ca produces the deterioration on the superconducting properties, compared with the undoped sample.

Improvement of superconducting properties in Na-doped BSCCO superconductor

“…In previous works, the effects of several substitutions for Ca or Cu have been studied in detail [42][43][44][45]. On the other hand, in the best of our knowledge, no studies about the Na-substitution effect on the Bi-2212 properties have been made.…”

Effect of K substitution on Structural, Electrical and Magnetic Properties of Bi-2212 system

“…The normalized XRD patterns obtained for all the samples are presented in Fig.1 where the peaks for the Bi-2212 superconducting phase have been indicated by #2 [42]. From these graphs, it can be seen that both pure and K-doped samples contain the Bi-2212 phase as the major one, independently of the amount of the K doping.…”

“…In previous works, the effects of several substitutions for Ca or Cu have been estudied [39][40][41][42]. In the framework of this study, the modification of Bi-2212 ceramics physical properties induced by the K substitution for Ca has been determined by means of Xray analysis (XRD), scanning electron microscopy (SEM), electron dispersive X-ray (EDX), and magnetic measurements.…”

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

“…Among other successful techniques to produce well oriented grains, the laser texturing ensures a high degree of texture at relatively high rates [7][8][9][10][11]. Besides these useful methods used in the preparation of ceramic superconductors such as the laser floating zone (LFZ) [12] and the electrically assisted laser floating zone (EALFZ) techniques [13], cation doping [14][15][16][17][18][19][20][21][22][23][24][25][26][27] or metallic additions [28][29][30] can also ensure the important improvements in the basic properties of the BSCCO system.…”