Bulk nanocrystalline superconducting YBa2Cu3O7-x

Xiang, Jian Yong; Fleck, Catherine; Hampshire, D.P.

doi:10.1088/1742-6596/97/1/012237

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…It is noted that the self-field J c increases dramatically to 830 A/cm 2 with the CNFs addition for sample x = 0.4 wt%. Such enhancement in J c could be related to the improved grain connectivity [23,24]. The variation of the transport J c of the pure and samples with CNFs addition is as shown in Fig.…”

Section: Transport Critical Current Density J Cmentioning

confidence: 88%

“…Reflections of CNFs were not observed in the patterns due to the fact that the amount of CNFs addition (x values) could be too small. In other words, there is no peak from CNFs as observed in the XRD patterns of the added samples, showing that those they could have diffused into the crystal structure of the bulk Y-123 [24]. The lattice parameter c-axis decreased with increasing amount of CNFs addition.…”

Section: Structural Analysismentioning

confidence: 93%

“…It has been shown that of the choice of the type and amount of chemical compound and impurities could improve both inter-granular and intra-granular J c in different high temperature superconductors [4,22]. Moreover, doping of YBCO samples with another suitable compounds with a right proportion is a reliable method in order to achieve highly qualified complex structures [23] with improved grain boundary superconducting properties [24]. In our previous research we have shown that the J c can be significantly enhanced by adding small amount of carbon nanotube (CNTs) indicating the formation of pinning centers in YBCO matrix [25].…”

Section: Introductionmentioning

confidence: 99%

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Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

Khalid

Kechik

Baharuddin

et al. 2020

J Mater Sci: Mater Electron

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The effects of carbon nanofibers addition on transport and superconducting properties of YBa2Cu3O7−δ (Y-123) superconductor were studied. Y-123 was prepared using co-precipitation method for good quality bulk of high temperature superconducting material. Carbon nanofibers with 0.2–0.8 wt% were added into Y-123 superconductors. The samples were characterized using electrical resistance measurement for critical temperature (Tc) and critical current density (Jc), powder X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray analysis. Most of the samples indicated a dominant Y-123 phase of an orthorhombic structure with a minor phase of BaCO3 and Y-124. Onset critical temperature was found to decrease from 90.5 to 80 K with increasing of carbon nanofibers concentration. The Jc for pure sample is 11 A/cm2 at 30 K while the Jc of sample with 0.4 wt% carbon nanofibers is 830 A/cm2 at 30 K. Introduction of carbon nanofibers enhanced Jc significantly. However, further addition of carbon nanofibers in Y-123 superconductor caused degradation in Jc.

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Section: Transport Critical Current Density J Cmentioning

confidence: 88%

Section: Structural Analysismentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

Khalid

Kechik

Baharuddin

et al. 2020

J Mater Sci: Mater Electron

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“…Next, samples were milled using the miller and tungsten carbide (WC 94/Co 6) milling media in an argon atmosphere. In an earlier pilot study, we used copper milling media [35]. Although it is expected that copper is less detrimental to the superconducting properties of YBCO than WC or Co, we choose not to use Cu milling media in this work because it is too soft.…”

Section: Fabrication Of Nanocrystalline Materialsmentioning

confidence: 99%

“…c In addition, our group has developed the expertise to make good nanocrystalline materials [32][33][34][35][36][37]. The approach we have adopted is to try to make a sufficiently broad range of YBCO samples and measurements to enable us to identify whether J D or J P limits J .…”

mentioning

confidence: 99%

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?

Wang

Raine

Hampshire

2017

Supercond. Sci. Technol.

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Although we can use misorientation angle to distinguish the grain boundaries that can carry high critical current density in high temperature superconductors (HTS) from those that cannot, there is no established normal state property equivalent. In this paper, we explore the superconducting and normal state properties of the grains and grain boundaries of polycrystalline YBa2Cu3O7−x (YBCO) using complementary magnetisation and transport measurements, and calculate how resistive grain boundaries must be to limit in polycrystalline superconductors. The average resistivity of the grain boundaries, in our micro- and nanocrystalline YBCO are 0.12 Ωm and 8.2 Ωm, values which are much higher than that of the grains and leads to huge values of 2 × 103 and 1.6 × 105 respectively. We find that the grain boundaries in our polycrystalline YBCO are sufficiently resistive that we can expect the transport to be several tens of orders of magnitude below the potential current density of the grains in our YBCO samples, as is found experimentally. Calculations presented show that increasing values by ∼2 orders of magnitude in high fields is still possible in all state-of-the-art technological high-field superconductors. We conclude: grain boundary engineering is unlikely to improve sufficiently in randomly aligned polycrystalline YBCO, to make it technologically useful for high-field applications; in low temperature superconducting intermetallics, such as Nb3Sn, large increases in may be achieved by completely removing the grain boundaries from these materials and, as is the case for thin films of Nb, Ba(FeCo)2As2 and HTS materials, by incorporating additional artificial pinning.

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The Effect of Silver Inclusion on Superconducting Properties of YBa2Cu3O y Prepared Using Planetary Ball Milling

Hamrita

Azzouz

Dachraoui

et al. 2013

J Supercond Nov Magn

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Bulk nanocrystalline superconducting YBa₂Cu₃O_7-x

Cited by 8 publications

References 28 publications

Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?

The Effect of Silver Inclusion on Superconducting Properties of YBa2Cu3O y Prepared Using Planetary Ball Milling

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Bulk nanocrystalline superconducting YBa2Cu3O7-x

Cited by 8 publications

References 28 publications

Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

Carbon nanofibers addition on transport and superconducting properties of bulk YBa2Cu3O7−δ material prepared via co-precipitation

How resistive must grain boundaries in polycrystalline superconductors be, to limitJc?

The Effect of Silver Inclusion on Superconducting Properties of YBa2Cu3O y Prepared Using Planetary Ball Milling

Contact Info

Product

Resources

About

Bulk nanocrystalline superconducting YBa₂Cu₃O_7-x

How resistive must grain boundaries in polycrystalline superconductors be, to limitJ_c?