Interface control in all metalorganic deposited coated conductors: Influence on critical currents

AbstractIn this work we will report our recent progress in the control of the interface quality between buffer layers and YBCO thin films grown by the trifluoroacetates route (TFA) and how it influences the critical current of the coated conductors. We have mainly focused on vacuum and metalorganic deposited (MOD) fluorite-like CeO2 buffer layers and on MOD perovskite SrTiO3 buffer layers. We will show that for vacuum CeO2 buffer layers, microcracks at the surface can be controlled by the means of thermal treatments. Coated conductors TFA-YBCO/CeO2sputt/YSZ/CeO2/Ni with Jc(77K)˜1MA/cm2 can be grown even in the presence of these microcracks. For MOD SrTiO3 we will show that growing the buffer layer at low temperature reduces surface roughness and multilayers with high critical currents can be achieved. An all-chemical coated conductor has been grown TFA-YBCO/SrTiO3MOD/BaZrO3MOD/NiO-SOE/Ni with promising in-plane texture, Δ φYBCO=6.6°. For MOD CeO2 buffer layers, thermal annealings in oxidizing atmospheres lead to atomically flat surfaces that avoid the typical polycrystalline surfaces observed in MOD CeO2 grown in Ar/H2. High Jc multilayers can be achieved and the first all chemical coated conductor in IBAD tapes TFA-YBCO/CeO2MOD/YSZIBAD/SS has been obtained with Jc(60K)=2.3MA/cm2.

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The microstructure of continuously processed Yba2Cu3Oy coated conductors with underlying CeO2 and ion-beam-assisted yttria-stabilized zirconia buffer layers

Journal of Materials Research ◽

10.1557/jmr.2000.0158 ◽

2000 ◽

Vol 15 (5) ◽

pp. 1110-1119 ◽

Cited By ~ 56

Author(s):

T. G. Holesinger ◽

S. R. Foltyn ◽

P. N. Arendt ◽

H. Kung ◽

Q. X. Jia ◽

...

Keyword(s):

Interfacial Reaction ◽

Ion Beam ◽

Misfit Strain ◽

Critical Currents ◽

Coated Conductors ◽

Yttria Stabilized Zirconia ◽

Buffer Layers ◽

Inconel 625 ◽

Microstructural Development ◽

Stabilized Zirconia

The microstructural development of YBa2Cu3Oy (Y-123) coated conductors based on the ion-beam-assisted deposition (IBAD) of yttria-stabilized zirconia (YSZ) to produce a biaxially textured template is presented. The architecture of the conductors was Y-123/CeO2/IBAD YSZ/Inconel 625. A continuous and passivating Cr2O3 layer forms between the YSZ layer and the Inconel substrate. CeO2 and Y-123 are closely lattice-matched, and misfit strain is accommodated at the YSZ/CeO2 interface. Localized reactions between the Y-123 film and the CeO2 buffer layer result in the formation of BaCeO3, YCuO2, and CuO. The positive volume change that occurs from the interfacial reaction may act as a kinetic barrier that limits the extent of the reaction. Excess copper and yttrium generated by the interfacial reaction appear to diffuse along grain boundaries and intercalate into Y-123 grains as single layers of the Y-247, Y-248, or Y-224 phases. The interfacial reactions do not preclude the attainment of high critical currents (Ic) and current densities (Jc) in these films nor do they affect to any appreciable extent the nucleation and alignment of the Y-123 film.

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Critical Currents of Overdoped Co-evaporated YBCO Coated Conductors

MRS Proceedings ◽

10.1557/proc-1001-m14-04 ◽

2007 ◽

Vol 1001 ◽

Cited By ~ 2

Author(s):

Jens Hänisch ◽

Jonathan Storer ◽

Chris Sheehan ◽

Yates Coulter ◽

Vladimir Matias

Keyword(s):

Critical Temperature ◽

Critical Current Density ◽

Oxygen Content ◽

Lattice Spacing ◽

Surface Coverage ◽

Critical Currents ◽

Coated Conductors ◽

Hole Doping ◽

Coated Conductor ◽

Ybco Coated Conductors

AbstractCoated conductor samples, prepared by reactive co-evaporation, are investigated with respect to the hole-doping dependence of the critical current density. The samples are annealed in an atmosphere of variable oxygen content after which critical currents, critical temperature and the c-axis lattice spacing are measured. The lattice spacing increases with decreasing oxygen content, consistent with literature data. These co-evaporated samples show hole overdoped behavior with respect to the maximum Tc. The achievable range of hole doping in these samples seems to depend on surface coverage. Both self-field and in-field Jc at 75.5 K have a maximum in the overdoped region but at less than maximum oxygen content. The reason for the overdoping of these samples is discussed briefly in terms of Y-Ba disorder.

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Grain and grain-boundary critical currents in coated conductors with noncorrelating YBa2Cu3O7 and substrate grain-boundary networks

Applied Physics Letters ◽

10.1063/1.2172737 ◽

2006 ◽

Vol 88 (13) ◽

pp. 132508 ◽

Cited By ~ 9

Author(s):

A. Palau ◽

T. Puig ◽

X. Obradors ◽

R. Feenstra ◽

A. A. Gapud ◽

...

Keyword(s):

Grain Boundary ◽

Critical Currents ◽

Coated Conductors

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CRITICAL CURRENTS IN ROEBEL ASSEMBLED COATED CONDUCTORS (RACC)

10.1063/1.2900383 ◽

2008 ◽

Cited By ~ 3

Author(s):

W. Goldacker ◽

A. Frank ◽

R. Heller ◽

B. Ringsdorf ◽

S. I. Schlachter ◽

...

Keyword(s):

Critical Currents ◽

Coated Conductors

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Measurement of local critical currents in TFA-MOD processed coated conductors by use of scanning Hall-probe microscopy

Physica C Superconductivity ◽

10.1016/j.physc.2011.05.119 ◽

2011 ◽

Vol 471 (21-22) ◽

pp. 1041-1044 ◽

Cited By ~ 1

Author(s):

K. Shiohara ◽

K. Higashikawa ◽

T. Kawaguchi ◽

M. Inoue ◽

T. Kiss ◽

...

Keyword(s):

Critical Currents ◽

Coated Conductors ◽

Hall Probe ◽

Probe Microscopy ◽

Scanning Hall Probe Microscopy

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Current Capacity of Cu-Sheathed Multifilamentary Coated Conductors Under the Influence of Spatial Variation of Local Critical Currents in Each Filament

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2018.2794965 ◽

2018 ◽

Vol 28 (3) ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

Kohei Higashikawa ◽

Takumi Suzuki ◽

Masayoshi Inoue ◽

Shinji Fujita ◽

Yasuhiro Iijima ◽

...

Keyword(s):

Spatial Variation ◽

Critical Currents ◽

Coated Conductors

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Effects of Unevenly Distributed Critical Currents and Damaged Coated Conductors to AC Losses of Superconducting Power Transmission Cables

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2010.2090637 ◽

2011 ◽

Vol 21 (3) ◽

pp. 953-956 ◽

Cited By ~ 12

Author(s):

Quan Li ◽

Naoyuki Amemiya ◽

Katsutoku Takeuchi ◽

Taketsune Nakamura ◽

Noboru Fujiwara

Keyword(s):

Power Transmission ◽

Critical Currents ◽

Coated Conductors ◽

Ac Losses

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YBCO-Coated Conductors Manufactured by High-Rate Pulsed Laser Deposition

MRS Bulletin ◽

10.1557/mrs2004.165 ◽

2004 ◽

Vol 29 (8) ◽

pp. 583-589 ◽

Cited By ~ 45

Author(s):

Alexander Usoskin ◽

Herbert C. Freyhardt

Keyword(s):

Pulsed Laser Deposition ◽

High Temperature Superconductors ◽

Pulsed Laser ◽

Critical Currents ◽

Coated Conductors ◽

Laser Deposition ◽

High Rate ◽

Quasi Equilibrium ◽

Ybco Films ◽

Ybco Coated Conductors

AbstractHigh-temperature superconductors of the second generation—coated conductors—are based on an architecture of YBCO films deposited on a well-textured substrate tape. The deposition technique used in the processing of YBCO films is responsible not only for both the resulting critical currents in the conductors and the cost efficiency of the employed production route, but also for the ultimate viability of the chosen technology. This article describes an advanced deposition method for YBCO films using high-rate pulsed laser deposition (HR-PLD).An elaborate variable azimuth ablation allows target roughening to be considerably reduced in the course of continuous deposition, and as a result, the integral deposition speed and speed stability can be increased to technologically interesting high values.Well-selected process parameters have been demonstrated to yield high currents of up to 480A/cm-width in short tapes and 360A/cm-width in 6-m-long tapes.Together with quasi-equilibrium heating, the HR-PLD method allows the processing of long-length YBCO-coated conductors and offers a cost-efficient route for their production on an industrial scale.

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