Microstructures of REBa2Cu3Oy adding BaZrO3 or BaSnO3

Ichinose, Ataru; Mele, P.; Horide, Tomoya; Matsumoto, Kaname; Goto, G; Mukaida, Masashi; Kita, R.; Yoshida, Yutaka; Horii, Shigeru

doi:10.1016/j.physc.2008.05.085

Cited by 17 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The correlation of the nanorods in the film thickness direction (c-axis direction) was also obtained in other experiments. In the relatively thick YBCO films containing the BaZrO 3 or BaSnO 3 nanorods, a particular structure called the ''Fireworks structure" [11,15] was observed in plan-view TEM images, as shown in Fig. 4.…”

Section: Microstructures Of Nanorods As One-dimensional Apcsmentioning

confidence: 98%

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Ichinose

Mele

Matsumoto

et al. 2009

Physica C: Superconductivity

Self Cite

View full text Add to dashboard Cite

Section: Microstructures Of Nanorods As One-dimensional Apcsmentioning

confidence: 98%

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Ichinose

Mele

Matsumoto

et al. 2009

Physica C: Superconductivity

Self Cite

View full text Add to dashboard Cite

“…1(c) shows that the BHO nano-rods radiate from central points of the so-called "fireworks" structures. 27 This indicates that the nano-rods at the center of a firework region and those surrounding the center grow parallel to, and tilt away from, respectively, the c-axis of the film. We determined the diameter and number density of the nano-rods [ Fig.…”

mentioning

confidence: 98%

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

et al. 2016

Self Cite

View full text Add to dashboard Cite

For use in high-magnetic-field coil-based applications, the critical current density (Jc) of REBa2Cu3Oy (REBCO, where RE = rare earth) coated conductors must be isotropically improved, with respect to the direction of the magnetic field; these improvements must be realized at the operating conditions of these applications. In this study, improvement of the Jc for various applied directions of magnetic field was achieved by controlling the morphology of the BaHfO3 (BHO) nano-rods in a SmBCO film. We fabricated the 3.0 vol. % BHO-doped SmBCO film at a low growth temperature of 720 °C, by using a seed layer technique (Ts = 720 °C film). The low-temperature growth resulted in a morphological change in the BHO nano-rods. In fact, a high number density of (3.1 ± 0.1) × 103 μm−2 of small (diameter: 4 ± 1 nm), discontinuous nano-rods that grew in various directions, was obtained. In Jc measurements, the Jc of the Ts = 720 °C film in all directions of the applied magnetic field was higher than that of the non-doped SmBCO film. The Jcmin (6.4 MA/cm2) of the former was more than 6 times higher than that (1.0 MA/cm2) of the latter at 40 K, under 3 T. The aforementioned results indicated that the discontinuous BHO nano-rods, which occurred with a high number density, exerted a 3D-like flux pinning at the measurement conditions considered. Moreover, at 4.2 K and under 17 T, a flux pinning force density of 1.6 TN/m3 was realized; this value was comparable to the highest value recorded, to date.

show abstract

“…The pinning due to the columnar defects appears to be more than the intrinsic pinning due to the layered structure of YBCO. YBCO+BZO samples also showed similar peaks in J c at H//C and J c at H//ab orientations due to the presence of BZO nanorods [48,49] [51] compositions. These samples also showed the formation of nanocolumns and accordingly improved properties.…”

Section: Ybco + Bso Films On Coated -Conductor Technical Substrates (mentioning

confidence: 77%

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

Varanasi

Barnes

2010

High Temperature Superconductors

View full text Add to dashboard Cite

5.1 IntroductionCoated conductors are electrical conductors prepared with YBa 2 Cu 3 O 7 -x ( YBCO ) superconducting material coatings deposited on metallic substrates along with several other intermediate buffer layers. Buffer layers are deposited sequentially on the metallic substrates prior to YBCO deposition to serve as barrier layers. They are selected such that epitaxial relationships are maintained throughout the thickness of the coated conductors to obtain highly -textured YBCO coatings. To process conductors with high critical current density ( J c ), highly -textured YBCO coatings with both in -plane and out -of -plane alignment of grains are required with grain boundary misorienation angles below 5 o . More details of the texture requirements, processing, and different types of coated conductor architectures can be found in other chapters of this book as well as in the references [1 -5] . Two primary industrial approaches are used to manufacture the coated conductors. One approach uses a rolling assisted biaxially textured (RABiTS ™ ) metallic substrate such as N -5 at.% W with sputtered Y 2 O 3 /YSZ/Ce 2 O 3 buffer layers and YBCO layer deposited by the metallo -organic deposition ( MOD ) technique [3] . In the second approach, a polycrystalline Hastealloy ™ substrate is coated with textured MgO buffer layer grown by ion beam assisted deposition ( IBAD ) and other subsequent buffer layers [4] . YBCO is deposited by metallo -organic chemical vapor deposition ( MOCVD ) on these substrates. In recent years, impressive progress has been made in the manufacturing of long lengths of YBCO coated conductors processed by using both the RABiTS ™ substrates as well as IBAD substrates [6,7] . Such longlength coated conductors are needed to make coils for rotating machinery and cables for electrical transmission. However, in high magnetic fi eld applications such as MRI (Magnetic Resonance Imaging), SMES (Superconducting Magnetic Energy Storage), superconducting magnets and generators, etc., high J c at high magnetic fi elds needs to be maintained. In the absence of fl ux pinning centers in the coated conductors, the magnetic fl ux lines will move due to Lorenz forces acting upon them at high fi elds. This motion causes dissipation, and losses will occur as a result. This lowers the J c in coated conductors. Hence, it is important High Temperature Superconductors. Edited by Raghu Bhattacharya and M. Parans Paranthaman

show abstract

Microstructures of REBa2Cu3Oy adding BaZrO3 or BaSnO3

Cited by 17 publications

References 14 publications

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications

Contact Info

Product

Resources

About

Microstructures of REBa2Cu3Oy adding BaZrO3 or BaSnO3

Cited by 17 publications

References 14 publications

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Microstructures of REBa2Cu3Oy films containing artificial pinning centers of various dimensions

Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth

Flux Pinning Enhancement in YBa 2 Cu 3 O 7–x Films for Coated Conductor Applications

Contact Info

Product

Resources

About

Flux Pinning Enhancement in YBa ₂ Cu ₃ O _7–x Films for Coated Conductor Applications