Critical current enhancement in YBCO–Ag melt-textured composites: influence of microcrack density

Mendoza, Ernest; Puig, T.; Varesi, E.; Carrillo, A.E.; Plain, Jérôme; Obradors, X.

doi:10.1016/s0921-4534(00)00098-8

Cited by 62 publications

(58 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found that Ag enhances the critical current density and magnetic-flux trapping [6,7]. Also, silver improves the grain growth and helps to obtain a better grain orientation, lowering the electrical resistance in the normalstate [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Azambuja¹,

Júnior²,

Jurelo³

et al. 2009

Braz. J. Phys.

View full text Add to dashboard Cite

The effects of Ag addition on some physical properties of Y Ba 2 Cu 3 O 7−δ superconductor has been studied. The samples were produced by different routes and characterized by scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction and nanoindentation. The superconducting properties were studied by dc magnetization and electrical resistivity measurements. The X-ray patterns revealed that all samples were polycrystalline and corresponded to the orthorhombic Y Ba 2 Cu 3 O 7−δ phase. However, for some samples, silver appears to be present within the grains. The superconducting properties were not significantly influenced by Ag addition. Hardness and elastic modulus were also obtained by instrumented indentation. Ag addition was found to be effective in improving the mechanical properties, probably by filling the pores in the grain boundaries. Hardness profiles indicated values between 3.1 and 3.4 GPa at deep tip penetration depths. The highest elastic modulus of 146 GPa was attained for samples prepared using Y 2 O 3 , BaCO 3 , CuO and Ag 2 O as precursors, while the lowest modulus (125 GPa) was obtained for the pure Y Ba 2 Cu 3 O 7−δ sample.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Azambuja¹,

Júnior²,

Jurelo³

et al. 2009

Braz. J. Phys.

View full text Add to dashboard Cite

show abstract

“…38,39 From the SEM results, there is a clear evidence that both grain coupling and grain boundary change significantly upon addition of BZO in YBCO and hence one expects a proportional change in J C as well. To establish and quantify the change in J C , isothermal magnetization measurements were carried out and these results are shown in fig.…”

Section: Resultsmentioning

confidence: 96%

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Malik

2016

AIP Advances

View full text Add to dashboard Cite

We report the superconducting state properties of YBa2Cu3O7 (YBCO) on introduction of BaZrO3 (BZO) as a secondary phase. YBCO+xBZO (x= 0, 2, 4, 6, and 10 wt%) composite samples were prepared by solid state reaction method and characterized for structural, morphological and superconducting properties. X-ray diffraction confirms the increased crystallinity and images of scanning electron microscopy measurement show an increase in both grain size and grain connectivity on addition of BZO in YBCO. These effects are well pronounced in an applied magnetic field. Critical current density, JC, as well as the pinning force peaks at 4% of BZO concentration showed significant difference. A three-fold enhancement in JC and a six-fold enhancement in pinning force were observed at this optimum BZO concentration. This has been attributed to the pinning of flux lines in YBCO due to introduction of BZO as a secondary phase. These results show that this composite has potential application in high current applications.

show abstract

“…Many studies have been made for the influence of Ag doping into the YBCO by different processes. An increase in the critical current density has been observed by Mendoza et al [5]. The study related to the destruction in the grain boundaries and the enhancement in the critical current density by electrochemical Ag doping has been made by Matsumoto et al [7].…”

Section: Introductionmentioning

confidence: 91%

Investigation of the variation in weak-link profile of YBa2Cu3−xAgxO7−δ superconductors by Ag doping concentration

Tepe

Avci

Kocoglu

et al. 2004

Solid State Communications

View full text Add to dashboard Cite

The effect of Ag doping concentration on the microstructure, transport properties and weak-link profile of YBa 2 Cu 32x -Ag x O 72d bulk superconducting compound was investigated through resistance -temperature ðR-TÞ; ac magnetic susceptibility ðx 2 TÞ; scanning electron microscope (SEM), X-ray diffraction (XRD) and the critical current density ðJ c Þ versus applied magnetic field ðJ c 2 BÞ measurements. We used the additive method with cationic ratio of x ¼ 0:1 2 0:4 for the YBCO-Ag system. The change in the silver doping concentration slightly affected the transition temperatures ðT c;zero Þ; whereas, the critical current densities ðJ c Þ of the samples and their magnetic field ðBÞ dependencies were noticeably affected. The improvement on the microstructural properties of YBCO bulk superconductors was observed in SEM analysis, the J c values increased and their magnetic field dependencies decreased with the increasing of Ag concentration up to x ¼ 0:2: As well as the current transport properties. Ag doping up to a certain amount produces texturing that gives rise to a modification in the weak-link profile resulting in an enhanced strength of flux pinning which causes an increase in the current carrying capacity. q

show abstract

Critical current enhancement in YBCO–Ag melt-textured composites: influence of microcrack density

Cited by 62 publications

References 26 publications

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Investigation of the variation in weak-link profile of YBa2Cu3−xAgxO7−δ superconductors by Ag doping concentration

Contact Info

Product

Resources

About