Superconducting Properties of 100-m Class Sr0.6K0.4Fe2As2 Tape and Pancake Coils

Zhang, Xianping; Oguro, Hidetoshi; Yao, Chao; Dong, Chune; Xu, Zhen‐Jiang; Wang, Dongliang; Awaji, Satoshi; Watanabe, Kazuo

doi:10.1109/tasc.2017.2650408

Cited by 63 publications

(53 citation statements)

References 24 publications

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“…38 Poly(ZDA) behaves in a similar fashion. 39 As can be seen in Table II its residue at 650 C measured under air or nitrogen is close to the calculated amount of zinc oxide that should remain. Despite the fact that DOPO usually mainly acts in gas phase, both DOPO-containing compounds possess a drastically enlarged residue compared to Poly(ZDA).…”

Section: Synthesissupporting

confidence: 70%

Novel phosphinate‐containing zinc polyacrylate and its utilization as flame retardant for polyamides

Garth

Döring

Kraemer

et al. 2019

J of Applied Polymer Sci

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A new organophosphorus, zinc‐containing polyacrylate is synthesized that has potential use as flame retardant for polyamides. To achieve this goal, the Phospha‐Michael addition is utilized to selectively add 9,10‐dihydro‐9‐oxa‐10‐phospha‐phenanthrene‐10‐oxide (DOPO) to one acrylate group of zinc acrylate followed up by radical polymerization of the remaining acrylate group in a one‐pot approach. To verify the effectiveness of the synthesis method, it is compared to a second two‐step approach via diethyl zinc. In order to investigate the influence of molecular weight as well as phosphorus content on the flame retardant properties, the small‐molecule complex zinc bis(3‐(6‐oxidodibenzo[c,e][1,2]oxaphosphinin‐6‐yl)propionate) and the nonphosphorus thermoset poly(zinc diacrylate) are synthesized as well. All three substances are investigated as flame retardants for pure and glass‐fiber (GF) reinforced polyamide 6 (PA 6) and 66 (PA 66) in different compounds with and without melamine polyphosphate (MPP). Most of the samples show excessive dripping in the vertical burning test UL‐94 V. However, V‐1 classification is achieved in GF‐reinforced PA 66 with the DOPO‐ and zinc‐containing polyacrylate in combination with MPP. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47586.

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Section: Synthesissupporting

confidence: 70%

Novel phosphinate‐containing zinc polyacrylate and its utilization as flame retardant for polyamides

Garth

Döring

Kraemer

et al. 2019

J of Applied Polymer Sci

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“…Among them, the in-field J c of 122 wires has already reached the practical level of 10 5 A/cm 2 , 99 and a 120 m long tape of K-doped Sr-122 has been realized. 100 However, biaxially textured films on single-crystalline substrates and also single crystals 21 showed superior J c -H performance to polycrystalline samples. To date, seven groups have published results on FBS films on technical substrates as prototype coated conductor samples, as summarized in The respective in-plane and out-of-plane full width at half maximum of Fe(Se,Te)…”

Section: Fbs Thin Films On Technical Substratesmentioning

confidence: 98%

“…This is consistent with our studies, although their films are pnictides, whereas our films are chalcogenides. [100] in-plane without extra in-plane rotational domains. Concerning the crystallite quality of e two types of Ba122:P film, the FWHM values of out-of-plane diffraction (Fig.…”

Section: Resistance and Superconducting Transitionmentioning

confidence: 99%

Fe-based superconducting thin films on metallic substrates: Growth, characteristics, and relevant properties

Iida

Hänisch

Tarantini

2018

Applied Physics Reviews

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The discovery of Fe-based superconductors (FBS) as the second class of high-temperature superconducting transition (high-T c ) materials after the cuprates generated a significant impact on the community of fundamental and applied superconductivity research. Whenever a new class of high-T c superconducting materials is discovered, a lot of effort is devoted to growing single crystals and epitaxial thin films for exploring basic physical quantities. Although several properties of FBS are similar to the cuprates (large upper critical fields, as a consequence short coherence lengths, and small carrier density), others are distinctly different. For instance, in FBS the symmetry of the superconducting order parameter is most likely not a d-wave but an s±-wave, depending on the stoichiometry, crystallographic system, and doping level. Additionally, the critical current densities of FBS are less sensitive to the presence of grain boundaries (GBs) than those of the high-T c cuprates. These features are highly beneficial for the realization of cheaper conductors for high-field magnets at low temperatures. Indeed, several groups have demonstrated FBS thin films on technical metallic substrates and powder-in-tube processed FBS wires as proof-of-principle studies for conductor applications. FBS on technical substrates also give many opportunities for studying how GB networks affect the critical current and how uniaxial strain impacts the superconducting properties. In this article, we review FBS thin films, especially on technical metallic substrates, and focus on application-relevant properties like pinning improvement by natural and artificial defects as well as the transparency of grain boundaries and GB networks. The recent development of FBS thin films on technical substrates and their superconducting properties are presented and the performance gap with respect to films on single crystals is discussed.

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“…Iron-based superconductors have become a major topic of discussion these years due to their unique performance, such as a high superconducting transition temperatures (Tc) up to 55 K [1,2], large transport Jc over 1 MA/cm 2 achieved in thin films [3][4][5], and high upper critical field above 100 T [6,7] with low anisotropy (< 2 for Sr/BaKFeAs) [8,9]. In the past years, significant progresses towards high-performance iron-based conductors were made [10][11][12][13], the Jc value of Ba-122 wire and tapes had been rapidly improved to 1.5×10 5 A/cm 2 at 4.2 K and 10 T in short samples [14], and the 100 m class Sr1-xKxFe2As2 (Sr-122) tapes were fabricated last year [15]. However, for largescale use, it is very common to connect several pieces of long iron-based superconducting tapes.…”

Section: Introductionmentioning

confidence: 99%

Development of superconducting joints between iron-based superconductor tapes

Zhu

Wang

Zhu

et al. 2018

Supercond. Sci. Technol.

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Superconducting joints are essential for iron-based superconductor's applications in future. In this study, a process for fabricating superconducting joints between Sr1-xKxFe2As2 (Sr-122) tapes is developed for the first time. The Ag sheath was peeled off from one side of each sample. The exposed superconducting parts of the two tapes were joined and wrapped again with Ag foil. The diffusion bonding of the iron-based superconducting joint was achieved by hot-pressing process in Argon atmosphere. The superconducting properties, microstructures and the elements distribution of the joint regions had been investigated. The pressure and pressing times were optimized in order to enhance the transport current of the joints. At 4.2 K and 10 T, a transport critical current Ic of 57 A for the joint was obtained, which is approximately 63.3% of the current capacity of the tapes themselves. Furthermore, the joint resistances dV/dI were estimated from the V-I curve of the joints and the calculated joint resistances values are below 10 -9 Ω. These results demonstrate that the hot pressing was useful for fabricating the superconducting joint samples.

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Superconducting Properties of 100-m Class Sr0.6K0.4Fe2As2 Tape and Pancake Coils

Cited by 63 publications

References 24 publications

Novel phosphinate‐containing zinc polyacrylate and its utilization as flame retardant for polyamides

Novel phosphinate‐containing zinc polyacrylate and its utilization as flame retardant for polyamides

Fe-based superconducting thin films on metallic substrates: Growth, characteristics, and relevant properties

Development of superconducting joints between iron-based superconductor tapes

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