Details

Autor(en) / Beteiligte

• Zhang, Huiliang
• Huang, Daxing
• Zhang, Chunyuan
• Ding, Fazhu
• Gu, Hongwei

Titel

High homogeneity 10 cm long BaTiO3-doped YBa2Cu3O7-δ films by the trifluoroacetate metal-organic deposition process

Ist Teil von

• Journal of sol-gel science and technology, 2020-11, Vol.96 (2), p.297-303

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The trifluoroacetate metal-organic deposition (TFA-MOD) is one of the most appealing routes for the growth of high-quality YBa 2 Cu 3 O 7-δ (YBCO) coated conductors (CCs) due to its advantages of low cost and high efficiency. However, the puzzle of the inhomogeneities in microstructures and superconducting properties of YBCO CCs prepared based on the TFA-MOD route remain still a challenge. In this paper, 10 cm long YBCO films were prepared under different low-pressure conditions. These YBCO films were deposited on buffered Hastelloy C276 tapes using a dip coater. The effect of different ambient pressures on the microstructure and critical current density of YBCO films was investigated. High critical current density ( J C ) YBCO coated conductors with good homogeneity were obtained. The J C values (77 K, self-field) at different positions along the length direction of YBCO coated conductor were around 3.5–4 MA/cm 2 . The results showed that only under a suitable pressure the homogeneities of the microstructure and critical current density along the length direction of coated conductor can be greatly improved. The improvement was mainly ascribed to good texture and the absence of impurity phases BaF 2 and Ba 4 Y 2 O 7 in the films. Highlights Solution-deposited long YBa 2 Cu 3 O 7-δ CCs with high homogeneity were obtained. Excess water vapor causes formation of Ba 4 Y 2 O 7 in the YBCO films. Excess water vapor converts orientations of needle-shaped grains from order to disorder.