Epitaxial growth of heterostructures on biaxially textured metallic substrates for YBa2Cu3O7-x tape fabrication

Boffa, V.; Annino, C.; Bettinelli, Daniela; Ceresara, S.; Ciontea, L.; Fabbri, F.; Galluzzi, V.; Gambardella, U.; Celentano, G.; Grimaldi, Gaia; Mancini, A.; Petrișor, T.; Scardi, Paolo

doi:10.1080/01418630008221965

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…In the RABiTS approach, the thermo-mechanical processing of the substrate and the epitaxial growth of the buffer layer structures are the main aspects involved in the control of the YBCO texture degree. Even if the epitaxially grown buffer layers approximately replicate the substrate alignment, some materials which develop a sharper out-of-plane texture with respect to the substrate have been found, like TiN and Pd [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Pd layer on cube-textured substrates for MOD-TFA and PLD YBCO coated conductors

Mancini¹,

Celentano²,

Galluzzi³

et al. 2007

Supercond. Sci. Technol.

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Pd films were deposited on rolling assisted biaxially textured substrate (RABiTS) Ni–5 at.% W in order to exploit the Pd effect of the texture sharpening with respect to that of the substrate, for the development of YBa2Cu3O7−x (YBCO) coated conductors. The Pd sharpening effect was relevant in the out-of-plane direction where the reduction for the ω-scans’ full width at half maximum (FWHM) ranged from 55 to 65%, depending on the substrate roughness. The obtained minimum values of the FWHM in the transverse rolling direction of the (002) Pd ω-scan and in the (111) Pd ϕ-scan were of about 2.5° and 5°, respectively. The CeO2/YSZ/CeO2 (YSZ is Y2O3-stabilised ZrO2) heterostructure of the buffer layer was developed by pulsed laser deposition (PLD). In order to transfer the sharp orientation of the Pd film, both the seed CeO2 layer and the YSZ layer were deposited at low temperatures (450 °C), low enough to avoid Pd/Ni–W interdiffusion. The YBCO, films deposited by both PLD and metal-organic deposition (MOD) using metal trifluoroacetate acid (TFA), exhibited rolling direction (005) ω-scan and the (113) ϕ-scan FWHM values of about 2° and 5°, respectively. In spite of the complete interdiffusion between Ni and Pd during the YBCO film deposition, the coated conductors exhibit good adherence, as well as a smooth and crack-free surface. A zero-resistance critical temperature (TC0) of 90.8 K for the MOD-TFA YBCO films and critical current-density (JC) up to 2.2 MA cm−2 at 77 K and self-field for PLD YBCO films have been obtained.

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Section: Introductionmentioning

confidence: 99%

Pd layer on cube-textured substrates for MOD-TFA and PLD YBCO coated conductors

Mancini¹,

Celentano²,

Galluzzi³

et al. 2007

Supercond. Sci. Technol.

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“…37,54-59 PLD-grown films have contributed to studies on the effect of texture in coated conductors, 59,60 ac loss experiments, 61 bend strain tolerance, 55 and, in many studies, as a means to quantify the quality of buffer layers grown by a variety of methods. 58,[62][63][64][65][66][67] Recent results for long lengths of coated conductors are promising. * Reel-toreel deposition of YBa 2 Cu 3 O 7-δ with endto-end I c > 10 A for a 4.5 m tape and I c = 62 A (1 cm tape width) for shorter lengths and a film thickness of 4 µm were reported by Sato et al 68 Y. Iijima's group (Fujikura Ltd.) reported on a 9.6 m long carrying an I c = 50 A (1 cm tape width), corresponding to a current density J c = 0.42 MA/cm 2 .…”

Section: Pulsed Laser Deposition Of Yba 2 Cu 3 O 7-δ δ δ δmentioning

confidence: 99%

Pulsed Laser Deposition of YBa2Cu2O7−δ for Coated Conductor Applications: Current Status and Cost Issues

Christen

Second-Generation HTS Conductors

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INTRODUCTIONAmongst the numerous techniques currently being tested for the fabrication of coated conductors (i.e. high-temperature superconducting oxides deposited onto metallic tapes), pulsed laser deposition (PLD) plays a prominent role. Recent results from groups in the United States (e.g. Los Alamos National Laboratory), Europe (e.g. University of Göttingen), and Japan (e.g. Fujikura Ltd.) are most promising, yielding record numbers for J c and I c .As a method for depositing films of complex materials, such as the high-temperature superconductors (HTS) relevant to this chapter, PLD is well established and conceptually simple. Issues that have kept PLD from becoming a successful technique for devices and optical materials, namely particulate formation and thickness non-uniformities, are much less of a concern in the fabrication of HTS tapes. Nevertheless, the approach still presents ongoing challenges in the fundamental understanding of the laser-target interaction and growth from the resulting energetic plasma plume. Numerous issues related to the scale-up, control, reproducibility, and economic feasibility of PLD remain under investigation.It is clearly beyond the scope of this short chapter to give a complete treatise of such a complex subject -fortunately, several excellent reviews have already been published. 1-3 It is thus the intent of the author to introduce PLD only briefly and with a strong focus on HTS deposition, summarizing the most important developments and referring the reader to the numerous cited works. A strong emphasis is placed on issues related to scale-up.Finally, it is the goal of this chapter to introduce a preliminary cost-analysis of PLD for coated conductor fabrication. While an attempt to calculate the total cost of fabricating a length of superconducting tape would be beyond the scope of this chapter (and beyond our current knowledge of numerous issues), we can present a rather detailed analysis of the 2 cost of laser operation. The point, of course, is not to show that PLD is either cheaper or more expensive than other techniques -in fact, for most other techniques, which have not been successfully applied to long length fabrication, such a calculation cannot yet be made. It is illustrative, for example, to consider that in an industrial setting, more meters of coated tape will have to be produced per day than some other methods have produced in their entire history, and that therefore many reliability issues (including mean-time between failure of equipment) have not been addressed for many of the approaches described in this book. It is the maturity of industrial laser technology combined with the maturity of the PLD process that allows us to estimate these costs for this technique.

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