Effect of Yttrium substitution on superconductivity in Bi-2212 textured rods prepared by a LFZ technique

Abstract

In this study, the physical and superconducting properties of the Bi 2 Sr 2 Ca 1-x Y x Cu 2 O 8+ with x=0.0, 0.05, 0.075 0.1, and 0.20 textured superconducting rods prepared by a laser floating zone technique were presented. The effect of Y 3+ substitution for Ca 2+ has been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), dc-magnetization, magnetic hysteresis and critical current density calculation by using the Bean's critical state model. The powder XRD patterns of samples show that Bi-2212 phase is the major one. Along with the powder samples, the textured rod surfaces also were investigated by XRD. The grains found to be well-oriented along the longitudinal rod axis which is a typical result for superconductors prepared by laser floating zone (LFZ) method, has been observed. The best critical temperature, T C , has been found as 92.9 K for the sample with 0.15Y substitution, under DC magnetic field of 50 Oe in ZFC mode. It has also been observed that the critical current density decreases with increasing Ysubstitution. Using those values, the maximum J C value has been determined as 2.37x10 5 A/cm 2 for the undoped sample.

Laser Floating Zone Growth: Overview, Singular Materials, Broad Applications, and Future Perspectives

“…Due to the higher stability of the Bi-2212 phase, an important amount of work reported was focused on this phase [132,135,164,168,[173][174][175][176][177][178][179][180][181][182][183]. During these works, the Nd:YAG radiation started to be used as an alternative to the CO 2 lasers [168,175], observing that, with similar focusing optics, 1.06-µm radiation is more adequate to process textured Bi-2212 superconductors because these oxides absorb the 10.6-µm radiation mostly in the surface, creating larger radial temperature gradients and larger radial inhomogeneities due to constitutional supercooling.…”

“…Also, the substitution of some cations has been explored. For instance, Ca substitution by Y ions [181] generates an increase in the critical temperature values but with a deterioration of the grain alignment, while substitution by Rb [182] or Cs [183] leads to an increase of the pinning force at 10 K by about 20%.…”

“…High-temperature superconducting ceramics have been among the most commonly studied materials with LFZ [29,122,125,133,[160][161][162][164][165][166][167][168][169][170][171][172][173][174][175][176][177][178][179][180][181][182], probably because their anisotropic structure is ideal for directional solidification processing. As reviewed above, LFZ has demonstrated excellent microstructural transformations that result in high critical current elements in rod and tube geometries.…”

Magnetization of Bi2Sr2CaCu2O8+δ Micrometer Thin Ring and Its Depinning Line

“…4 and 9), measured by the torque magnetometer, show a typical superconducting behaviour and are comparable with the results, reported in refs. [69][70][71][72][73][74][75][76][77][78]. The ZFC and FC magnetization measurements of the disk at 100 Oe (Fig.…”

Influence mechanism of secondary gel technique on Bi-2212 superconducting phase: Gel model simulation and verification

“…Bi 2 Sr 2 Ca x-1 Cu x O y (BSCCO) superconductors have attracted significant attention due to its higher critical temperature (T c ) and critical current density, etc., which are more auspicious relative to other superconductors, e.g. MgB 2 and YBa 2 Cu 3 O 7-x [1][2][3][4][5][6][7][8][9][10]. These features make BSCCO systems promising as electric power transmission lines, fault current limiters, transformers and electromagnets.…”