Relationship Between Growth Speed and Magnetic Properties in Bi-2212/Ag Textured Composites

Özçelık

et al. 2017

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The structural and magnetic properties evolution of Cr-doped Bi 2 Sr 2 CaCu 2-x Cr x O y ceramics (x= 0.0, 0.05, 0.1, and 0.25) have been investigated using XRD, SEM, DC resistivity and M-H measurements. X-ray diffraction studies have shown that all samples are mainly composed of Bi-2212 phase, indicating that Cr can be incorporated in its crystal structure. The microstructure of the highly Cr-doped samples showed that some impurity phases appear, decreasing the conductivity between the grains. T c (onset) and T c (offset) have been improved for x=0.05 Cr doping, while 0.25 Cr doped samples are not superconducting. This behavior can be associated to changes in the hole concentration and/or the magnetic nature of Cr. The magnetic properties indicate that low Cr-doping enhances the loop widths. Additionally, the critical current densities, J c , of samples have been calculated by using the Bean's critical state model. It has been found that there are important improvements in J c values between 0.2-0.9 T applied magnetic fields for 0.05 Cr doped samples.

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“…In particular, it has been reported that samples grown at 15 mm/h using the LFZ method provides the highest grain alignment without internal cracks [16,17].…”

Section: Introductionmentioning

confidence: 99%

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

Gün

Özçelık

et al. 2017

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Özçelık

Madre

et al. 2015

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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.

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Improvement of the critical current density in Bi-2223 ceramics by sodium–silver co-doping

2014