Strong correlation betweenJc(T,H||c) andJc(77 K, 3 T||c) in Zr-added (Gd, Y)BaCuO coated conductors at temperatures from 77 down to 20 K and fields up to 9 T

Xu, Aihua; Delgado, Louis; Gharahcheshmeh, Meysam Heydari; Khatri, N D; Liu, Y; Selvamanickam, V.

doi:10.1088/0953-2048/28/8/082001

Cited by 26 publications

(22 citation statements)

References 31 publications

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“…By adopting a different synthesis route called MOCVD, researchers at University of Houston in USA have demonstrated that the incorporation of BZO in high volume fractions results in outstanding in-field J c performance of REBCO films which are relatively thicker (∼ 1-2 µm) [111][112][113][114][115][116]. The F pmax value of one of these composite films reached a record value of 1.7 TN/m 3 at 4.2 K together with extremely high µ 0 H irr ∼ 14.8 T (at 77 K), a value that is much higher than the µ 0 H irr ∼ 11 T of NbTi superconductor at 4.2 K [111].…”

Section: Figure 8 | (A)mentioning

confidence: 99%

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Jha

Matsumoto

2019

Front. Phys.

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The lossless transmission of direct electrical currents in superconductors is very often regarded as an "energy superhighway" with greatly enhanced efficiency. With the discovery of high temperature superconductors (HTS) in the late eighties, the prospect of using these materials in efficient and advanced technological applications became very prominent. The elevated operating temperatures as compared to low temperature superconductors (LTS), relaxing cooling requirements, and the gradual development of facile synthesis processes raised hopes for a broad breakthrough of superconductor technology. The impact of superconductor technology on the economy and energy sectors is predicted to be huge if these are utilized on a large scale. The development of superconducting tapes with high critical current density (J c) is crucial for their use in transmission cables. Many countries these days are running projects to develop wires from these HTS materials and simultaneously field trials are being conducted to assess the feasibility of this technology. These HTS wires can carry electrical currents more than 100 times larger than their conventional counterparts with minimal loss of energy. The increased efficiency of HTS electric power products may result in greatly reduced carbon emissions compared to those resulting from using the conventional alternatives. In order to use the thin films of YBa 2 Cu 3 O 7−δ (YBCO) and REBCO [RE (rare-earth) = Sm, Gd, Eu etc.], members of the HTS family, for future technological applications, the enhancement of J c over wide range of temperatures and applied magnetic fields is highly desired. The enhancement of J c of YBCO and REBCO films has been successfully demonstrated by employing different techniques which include doping by rare-earth atoms, incorporating nanoscale secondary phase inclusions into the REBCO film matrix, decoration of the substrate surface etc. which generate artificial pinning centers (APCs). In this review, the development of the materials engineering aspect that has been conducted over the last two decades to improve the current carrying capability of HTS thin films is presented. The effect of controlled incorporation of APCs through various methods and techniques on the superconducting properties of YBCO and REBCO thin films is presented, heading toward superior performance of such superconducting thin films.

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Section: Figure 8 | (A)mentioning

confidence: 99%

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Jha

Matsumoto

2019

Front. Phys.

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“…Xu et al [6] performed a series of 'washing' experiments to evaluate the fraction of bitumen involved in stabilisation of W/CO emulsions. In their study, increased amounts of water were blended into bitumen diluted with toluene.…”

Section: Only a Small Subfraction Of Asphaltenes Can Be Responsible Fmentioning

confidence: 99%

“…Bitumen washing experiments-how much 'emulsifier' is in bitumen? The procedure and results are plotted using the data of Xu et al [6] which will not be discussed here. However, all of the models available in the literature consider asphaltene molecules consisting mostly of hydrophobic moieties and having no hydrophilic head in their structure.…”

Section: Different Fractions Of Crude Oil/bitumen Can Be Responsible mentioning

confidence: 99%

Role of asphaltenes in stabilisation of water in crude oil emulsions

et al. 2013

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Even though asphaltenes do not have the well‐defined amphiphilic structure characteristic of surfactants, it has been shown that they can stabilise water‐in‐oil emulsions. We propose that this stabilisation occurs because asphaltene aggregation results in the formation of a network within the thin oil film separating approaching emulsified water droplets. This network changes the rheology of the film to non‐Newtonian, which prevents drainage of the film at thicknesses less than about 50–100 nm. The presence of the network also imparts steric stabilisation to the emulsion. The proposed stabilisation mechanism does not invoke any surfactant‐like behaviour of asphaltenes. Instead, it relies solely on their propensity to aggregate.

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“…最近美国休斯顿大学的Selvamanickam团队 [17,18] 实现了25%Zr(摩尔百分比)的高浓度掺杂, 极大提升 [8,16,17] . Figure 6 (Color online) Anisotropic J c for high-density Zr doped RE123 thin film [8,18] 面和应力效应均被报道具有很好的磁通钉扎效果.…”

Section: 本课题组长期致力Tfa-mod机理和成材效率问unclassified

Advance and challenge of secondary-generation high- temperature superconducting tapes for high field applications

Cai

Chi

et al. 2018

Chin. Sci. Bull.

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Strong correlation betweenJ_c(T,H||c) andJ_c(77 K, 3 T||c) in Zr-added (Gd, Y)BaCuO coated conductors at temperatures from 77 down to 20 K and fields up to 9 T

Cited by 26 publications

References 31 publications

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Superconductive REBCO Thin Films and Their Nanocomposites: The Role of Rare-Earth Oxides in Promoting Sustainable Energy

Role of asphaltenes in stabilisation of water in crude oil emulsions

Advance and challenge of secondary-generation high- temperature superconducting tapes for high field applications

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