Magnetism and ferromagnetic loss in Ni–W textured substrates for coated conductors

Ijaduola, A.O.; Thompson, James R.; Goyal, A.; Thieme, C.L.H.; Marken, K.R.

doi:10.1016/j.physc.2003.12.003

Cited by 108 publications

(74 citation statements)

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“…Subsequent increases of the tungsten content in the alloy give an even larger reduction of the magnetic properties. As shown previously, alloys with tungsten atomic fraction 9% are paramagnetic [4,6,7]. It has been determined that for tapes with this tungsten content there exist thermomechanical processing regimes giving the required quality of texture: >97% with {100} orientation.…”

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confidence: 59%

Composite Textured Substrate Tape for Second-Generation High-Temperature Superconductors with Low Magnetic Susceptibility

et al. 2016

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A design has been developed for three-layer composite substrate tapes based on a nickel-tungsten alloy and corrosion-resistant steel. Materials have been picked and experimental samples of three-layer composite tapes obtained. It has been shown that the substitution of corrosion-resistant steel for ferromagnetic nickeltungsten alloy in 60% of the tape volume decreases the saturation magnetization of the substrate tape by a factor of 2. The mechanical properties of the composite three-layer tape have been investigated. It has been shown that composite tapes are close in terms of the mechanical properties to tapes made from a homogeneous nickel-tungsten alloy. The conditions for the formation of a sharp cubic texture have been determined.Metal substrate tape of two types is now used to obtain long high-temperature superconductors: textured made from nickel-tungsten alloy and nontextured based on alloys such as Hastelloy or corrosion-resistant steel. The primary requirement for the fi rst type of tape is the presence of a sharp, biaxial, cubic texture. Ordinarily, nickel-tungsten based alloys are used to manufacture such tapes. Such alloys have a face-centered cubic structure and make it possible to form the requisite sharp, biaxial, cubic texture with {100} orientation perpendicular to the surface of the tape. The texture is formed as a result of thermomechanical treatment during in the tape fabrication process; this treatment consists of cold rolling with a high degree of general accumulated stress (usually 95% or more) and subsequent annealing [1].In order to use second-generation high-temperature superconductors in setups operating on ac current, the electromagnetic losses, which are determined by the magnetic properties of the substrate material, must be minimized. Nickel is a ferromagnetic metal with Curie temperature 631 K and specifi c saturation magnetization 56.7-58.5 cm 3 /g at 4.2 K. The nickel is alloyed with tungsten in order to decrease these indices [2][3][4]. For example, the Curie temperature of nickel-tungsten alloy with tungsten atomic fraction 5% equals 365 K and the specifi c saturation magnetization 25 cm 3 /g [5]. Subsequent increases of the tungsten content in the alloy give an even larger reduction of the magnetic properties. As shown previously, alloys with tungsten atomic fraction 9% are paramagnetic [4,6,7]. It has been determined that for tapes with this tungsten content there exist thermomechanical processing regimes giving the required quality of texture: >97% with {100} orientation. Therefore, such a material is most suitable for second-generation high-temperature superconductors.However, it becomes more diffi cult to obtain the requisite texture as the tungsten content increases, especially if the tungsten atomic fraction exceeds 5%. According to the data in [6], good texture quality in Ni-5W tape can be obtained after cold rolling with overall degree of accumulated strain 92% or higher. For Ni-9W alloy tape, the strain must be less than 99%. Alloys with this tungsten content are ha...

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confidence: 59%

Composite Textured Substrate Tape for Second-Generation High-Temperature Superconductors with Low Magnetic Susceptibility

et al. 2016

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“…[3] Specifically studied were the magnetic and loss properties of several biaxially Nii.xWx alloys, with tungsten contents x over the entire range of ferromagnetism, 0-9 at%. This alloy system has good strength and desirable compatibility with the usual conditions for materials fabrication.…”

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confidence: 99%

Magnetic Studies of Substrate and Superconductive Materials for Development of Advanced Coated Conductors

Thompson¹

2004

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“…Unfortunately, many nickel alloys are ferromagnetic materials, what provide to potential limitations related to ferromagnetic hysteretic losses in the substrate [19]. The use of diamagnetic Cu tapes as the base metal substrate avoids those limitations.…”

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confidence: 99%

Growth and Characterisation of Pulsed-Laser Deposited Tin Thin Films on Cube-Textured Copper at Different Temperatures

Szwachta

Gajewska

Kąc

2016

Archives of Metallurgy and Materials

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High-quality titanium nitride thin films have been grown on a cube-textured copper surface via pulsed laser deposition. The growth of TiN thin films has been very sensitive to pre-treatment procedure and substrate temperature. It is difficult to grow heteroexpitaxial TiN films directly on copper tape due to large differences in lattice constants, thermal expansion coefficients of the two materials as well as polycrystalline structure of substrate. The X-Ray diffraction measurement revealed presence of high peaks belonged to TiN(200) and TiN(111) thin films, depending on used etcher of copper surface. The electron diffraction patterns of TiN (200)/Cu films confirmed the single-crystal nature of the films with cube-on-cube epitaxy. The high-resolution microscopy on our films revealed sharp interfaces between copper and titanium nitride with no presence of interfacial reaction.

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Magnetism and ferromagnetic loss in Ni–W textured substrates for coated conductors

Cited by 108 publications

References 20 publications

Composite Textured Substrate Tape for Second-Generation High-Temperature Superconductors with Low Magnetic Susceptibility

Composite Textured Substrate Tape for Second-Generation High-Temperature Superconductors with Low Magnetic Susceptibility

Magnetic Studies of Substrate and Superconductive Materials for Development of Advanced Coated Conductors

Growth and Characterisation of Pulsed-Laser Deposited Tin Thin Films on Cube-Textured Copper at Different Temperatures

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