Deposition of potential Y2−xBixO3 buffer layers for YBCO coated conductor

Li, G.; Pu, M.H.; Du, Xiao Hua; Sun, Rui; Zhang, Heng; Zhao, Yong

doi:10.1016/j.physc.2007.05.025

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…(1) compensating the lattice misfit between NdBCO and MgO; (2) alleviating the problems related to the interface from the substrate. 10 As we know, the melting always initiates at defect sites (e.g., free surfaces and internal grain boundaries) because of their high free energy, defects of grain boundaries in one film play an important role in the thermal stability. Due to the excellent in-plane alignment, the grain boundaries in the NdBCO/YBCO/MgO thin film are much fewer than those in the NdBCO/MgO thin film, which predominantly takes the responsibility for the enhanced superheating capability in the NdBCO/YBCO/MgO thin film.…”

Section: Resultsmentioning

confidence: 99%

YBCO-buffered NdBCO film with higher thermal stability in seeding REBCO growth

Xu¹,

Chen²,

Cheng³

et al. 2012

Supercond. Sci. Technol.

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In this work, we report a strengthened superheating effect caused by a buffering YBa 2 Cu 3 O y (Y123 or YBCO) layer in the Nd 1+x Ba 2-x Cu 3 O 7-y (Nd123 or NdBCO) thin film with MgO substrate (i.e., NdBCO/YBCO/MgO thin film). In the cold-seeding melt-textured (MT) growth, the NdBCO/YBCO/MgO film presented an even higher superheating level, about 20 °C higher than that of non-buffered NdBCO film (i.e., NdBCO/MgO film). Using this NdBCO/YBCO/MgO film as seeds and undergoing a maximum processing temperature (T max ) up to 1120 °C, we succeeded in growing various RE 1+x Ba 2-x Cu 3 O 7-y (REBCO, RE=rare elements) bulk superconductors, including Gd 1+x Ba 2-x Cu 3 O 7-y (GdBCO), Sm 1+x Ba 2-x Cu 3 O 7-y (SmBCO) and NdBCO that have high peritectic temperatures (T p ). The pole figure (X-Ray Φ-scan) measurement reveals that the NdBCO/YBCO/MgO film has better in-plane 2 alignment than the NdBCO/MgO film, indicating that the induced intermediate layer improves the crystallinity of the NdBCO film, which could be the main origin of the enhanced thermal stability. In short, possessing higher thermal stability and enduring a higher T max in the MT process, the NdBCO/YBCO/MgO film is beneficial to the growth of bulk superconductors in two aspects: (1) broad application for high-T p REBCO materials; (2) effective suppression against heterogeneous nucleation, which is of great assistance in growing large and high-performance REBCO crystals.

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Section: Resultsmentioning

confidence: 99%

YBCO-buffered NdBCO film with higher thermal stability in seeding REBCO growth

Xu¹,

Chen²,

Cheng³

et al. 2012

Supercond. Sci. Technol.

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“…Single crystal LaAlO 3 (LAO) and SrTiO 3 (STO) with a dimension of 10mm×10mm have been used as substrate for SmBiO 3 deposition, while bi-axially textured NiW substrate has been used as metal substrate for SCO. The thermal processing details have been reported elsewhere [10][11][12]. REBCO superconducting layers have then been deposited through our lab developed fluorite-free polymer-assisted MOD route on buffered crystal or metal substrates.…”

Section: Methodsmentioning

confidence: 99%

All Chemical Solution Deposition Route toward REBCO Coated Conductors

Zhao

2009

2009 Fourth International Conference on Innovative Computing, Information and Control (ICICIC)

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This paper summarizes the recent efforts on the fabrication of REBCO (RE=Y and rare earth elements) coated conductor with an all fluorine-free chemical solution deposition (CSD) method in the Superconductivity R&D Center (SRDC) at SWJTU and UNSW. A critical current density, J c , is over 4 MA/cm 2 for YBCO deposited on LaAlO 3 , over 3 MA/cm 2 on SmBiO 3 buffered single crystal substrates, and of 1 MA/cm 2 on Sm-doped CeO 2 buffered metal substrate, demonstrating the feasibility of all CSD route for YBCO coated conductors.

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“…Convincingly, it is the YBCO intermediate layer that plays a role in improving the in-plane alignment of the NdBCO film. Similar to the sandwich structure of REBCO/buffer/substrate in coated conductors, the YBCO buffer layer in NdBCO/YBCO/MgO thin film performs functions in: (1) compensating the lattice misfit between NdBCO and MgO; (2) alleviating the problems related to the interface from the substrate [113]. Due to the excellent in-plane alignment, the grain boundaries in the NdBCO/YBCO/MgO thin film are much fewer than those in the NdBCO/MgO thin film.…”

Section: Ybco-buffered Ndbco Film With Enhanced Thermal Stability Formentioning

confidence: 99%