Development of textured substrates with low magnetism

Sakamoto, H.; Nagasu, Y.; Ohashi, Y.; Nakasaki, R.; Mimura, M.; Nakai, A.

doi:10.1016/j.physc.2007.04.257

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…Meanwhile, highly textured Ni-7.5 at.%W and Ni-9 at.%W substrates were successfully prepared recently by our group using distinct heat treatments during preparation for homogenization and stress relief [8,9]. Only a few other reports on highly textured substrates with higher W contents have been published [10,11]. It should be mentioned at this place, that an alternative approach to strengthen the substrate and to reduce the ferromagnetic Curie temperature is the use of a composite structure with a stronger non-ferromagnetic core material and a shell material, which exhibits a high texture quality [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Application of textured highly alloyed Ni–W tapes for preparing coated conductor architectures

Hühne

Eickemeyer

Sarma

et al. 2010

Supercond. Sci. Technol.

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An epitaxial Y2O3/YSZ/CeO2 buffer architecture has been prepared on cube textured Ni–5 at.%W, Ni–7.5 at.%W and Ni–9 at.%W tapes using pulsed laser deposition. The buffer layer growth was studied in detail and revealed a good texture transfer throughout the structure on the global as well as on the local scale. YBCO (yttrium barium copper oxide) layers were successfully deposited on the buffered tapes, showing an in-plane texture spread of about 7°. Microstructural investigations revealed clear interfaces and a homogeneous surface structure. A superconducting transition temperature of more than 89 K with a small transition width was observed for all metal substrates. A critical current density Jc of more than 0.9 MA cm − 2 was measured inductively at 77 K in the self-field on all substrates.

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Section: Introductionmentioning

confidence: 99%

Application of textured highly alloyed Ni–W tapes for preparing coated conductor architectures

Hühne

Eickemeyer

Sarma

et al. 2010

Supercond. Sci. Technol.

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“…It was found that the alloy with composition Ni-2 at.% W-10 at.% Cr is paramagnetic at 77 K. But the presence of large fraction of Cr leads to formation of Cr oxides on the tape surface that causes the local irregularities and damages in the microstructure of buffer layers applied whereas the alloys of Ni-W exhibit much better resistance to oxidation [7]. Standard Ni-W alloy with W content 5 at.% (Ni-5W) have T c = 365 K and M sat = 25 emu/g (4.2 K) [8].…”

Section: Introductionmentioning

confidence: 99%

Development of Composite RABiTS Tapes for Coated Conductors

Vorobieva

Abdyukhanov

Раков

et al. 2015

IEEE Trans. Appl. Supercond.

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Substrate materials are the key element of the coated conductors. There are two types of substrates-nontextured (stainless steel (SS) or Hastelloy alloys) and textured ones which are based on the Ni-W alloys. The main requirements for the textured tapes (RABiTS) are the presence of the highly pronounced biaxial cubic texture {100} < 100 > and low values of magnetic susceptibility. To realize these requirements RABiTS tapes of various kinds were developed-homogenous tapes from Ni-W alloys with W content 5.5-9 at.% and composite ones. Composite tapes consist of three layers-one of SS and two of Ni-W alloy with W content 6 at.%. Mechanical and magnetic properties of the tapes were investigated and the dependence of tapes texture quality from total accumulated deformations was studied. The ultimate tensile strength value of composite tapes was 750 ± 10 MPa. The conditions necessary to form the required {100} < 100 > texture are different for the homogeneous and composite tapes. According to the magnetic measurements saturation magnetization of composite tapes is about a factor of two lower than for similar homogeneous tapes.

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“…The presence of a soft magnetic underlayer may reduce the overall coercivity and remanence significantly, if a SmCo 5 layer is deposited on the Ni underlayer. The Curie temperature of Ni can be reduced below room temperature by doping W with a concentration of approximately 9 at% or higher [19]. The fcc-Ni based Ni-W solid solution may be a good candidate.…”

Section: Introductionmentioning

confidence: 99%