Surface engineering of biaxial Gd2Zr2O7 thin films deposited on Ni–5at%W substrates by a chemical solution method

Zhao, Yutao; Grivel, Jean‐Claude; Liu, Min; Suo, Hongli

doi:10.1039/c2ce06613k

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…An open issue that also needs further research is how to define appropriate S surface templates on RABiT substrates to control the buffer layer nucleation process. CSD growth of buffer layers on RABiT substrates has been widely explored; however, further understanding of the nucleation and growth processes is still needed [37], as well as to define the best processing methodologies to reach a low surface roughness and high quality multilayered structure [38][39][40]. So new oxide phases will be searched for which could simplify the CC architecture as well as new shortened processes which could lead to enhanced performances (surface planarity, film thickness for efficient protection, etc).…”

Section: Metallic Substrates and Buffer Layersmentioning

confidence: 99%

Coated conductors for power applications: materials challenges

Obradors

Puig

2014

Supercond. Sci. Technol.

347

245

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This manuscript reports on the recent progress and the remaining materials challenges in the development of coated conductors (CCs) for power applications and magnets, with a particular emphasis on the different initiatives being active at present in Europe. We first summarize the scientific and technological scope where CCs have been raised as a complex technology product and then we show that there exists still much room for performance improvement. The objectives and CC architectures being explored in the scope of the European project EUROTAPES are widely described and their potential in generating novel breakthroughs emphasized. The overall goal of this project is to create synergy among academic and industrial partners to go well beyond the state of the art in several scientific issues related to CCs' enhanced performances and to develop nanoengineered CCs with reduced costs, using high throughput manufacturing processes which incorporate quality control tools and so lead to higher yields. Three general application targets are considered which will require different conductor architectures and performances and so the strategy is to combine vacuum and chemical solution deposition approaches to achieve the targeted goals. A few examples of such approaches are described related to defining new conductor architectures and shapes, as well as vortex pinning enhancement through novel paths towards nanostructure generation. Particular emphasis is made on solution chemistry approaches. We also describe the efforts being made in transforming the CCs into assembled conductors and cables which achieve appealing mechanical and electromagnetic performances for power systems. Finally, we briefly mention some outstanding superconducting power application projects being active at present, in Europe and worldwide, to exemplify the strong advances in reaching the demands to integrate them in a new electrical engineering paradigm.

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Section: Metallic Substrates and Buffer Layersmentioning

confidence: 99%

Coated conductors for power applications: materials challenges

Obradors

Puig

2014

Supercond. Sci. Technol.

347

245

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“…With the aim of promoting the combustion of the organic component, a modified heat treatment with a low temperature (~ 350 °C) pyrolysis in air followed by the standard annealing has been proposed. The use of a two step annealing process for MOD film growth has been previously proposed also in [11,19]. The results obtained on NiW substrates showed an improvement of the buffer quality with direct positive consequences on YBCO properties [16].…”

Section: Discussionmentioning

confidence: 77%

MOD oxide buffer layers on metallic substrates for YBCO coated conductors

et al. 2013

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We present a detailed study carried out on oxide buffer layers grown by Metal-Organic Decomposition (MOD) on metallic substrates for YBa 2Cu3O7-x (YBCO) coated conductor applications. Precursor solutions have been made starting from acetates or pentanedionates and characterized by means of Differential Scanning Calorimetry (DSC) and Thermogravimetric (TG) analyses coupled with Fourier Transform Infra-Red spectroscopy (FT-IR). Thin buffer layers have been grown by spin-coating on Ni-5at.%W substrates. X-ray diffraction spectra (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) have been employed in order to optimize buffer layers in terms of film microstructure and surface quality, with the final aims of producing a suitable template for YBCO growth. It will be shown that the optimization of the recrystallization process can lead to high quality buffer layer allowing the growth of YBCO films showing good superconductive properties. Copyright © Materials Research Society 2013

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“…Martynova et al have demonstrated the similar impurity effect during the deposition of the SDP‐Al 2 O 3 . Actually, the carbon residue is a common issue for chemical solution derived oxide films by using organic educts . Cavallaro et al reported that the polycrystalline surface of the CeO 2 film, sintered at 750°C, is mainly due to the segregation of carbon at the grain boundaries and release of trace carbon residue are strongly related to the specific surface area, temperature and oxidation atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Chu

Zhao

Jiang³

et al. 2018

J Am Ceram Soc

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Tuning substrate properties is an effective methodology to modulate the texture development of MgO films deposited by ion beam-assisted deposition (IBAD) process for epitaxial oxide films. Herein, a solution deposition planarization (SDP) technique is employed to deposit Gd-Zr-O layer for engineering surface properties of the flexible metal substrate. The correlation between the Gd-Zr-O thin film microstructure and the IBAD-MgO texture is investigated. The coordinated study on atomic force microscopy (AFM) and reflection high-energy electron diffraction (RHEED) reveal that the grain coarsening during high-temperature sintering negatively influences the texture formation of IBAD-MgO. Moreover, the chemical environment of the atoms on the surface of Gd-Zr-O seed layer also plays a critical role, which is normally overlooked. The X-ray photoelectron spectroscopy (XPS) analysis indicates that the carbon residue and intermediate phase result in the poor texture of the IBAD-MgO. This phenomenon is related to the partial decomposition and synthesis reactions due to the lower sintering temperature or reduced surface to volume ratio. We demonstrate the high-quality texture of IBAD-MgO layer, deposited on mono-coated thick Gd-Zr-O film, by using optimal heat-treatment conditions. The cross-sectional TEM images present the dense Gd-Zr-O film with Gd 2 Zr 2 O 7 nanograins. The multifunctionalities, such as planarization, a barrier layer, and seed layer, of Gd-Zr-O layers are realized in full-stacked CeO 2 /LaMnO 3 /IBAD-MgO/SDP-Gd-Zr-O/C276 samples. This work demonstrates a route for simplifying the architecture of 2G-HTS using Gd-Zr-O layer and explores the effect of the surface properties on texture formation in IBAD-MgO layer. K E Y W O R D S chemical environment of the atoms, coated conductors, Gd-Zr-O amorphous films, ion beam-assisted deposition, solution deposition planarization, surface roughness

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Surface engineering of biaxial Gd2Zr2O7 thin films deposited on Ni–5at%W substrates by a chemical solution method

Cited by 9 publications

References 33 publications

Coated conductors for power applications: materials challenges

Coated conductors for power applications: materials challenges

MOD oxide buffer layers on metallic substrates for YBCO coated conductors

Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

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