The growth of YBCO films with high critical current at reduced pressures using the BaF2 ex situ process

J. Yoo; K. J. Leonard; H. S. Hsu; L. Heatherly; F. A. List; D. F. Lee; A. A. Gapud; P. M. Martin; S. Cook; M. Paranthaman; A. Goyal; D. M. Kroeger

doi:10.1088/0953-2048/17/10/023

The growth of YBCO films with high critical current at reduced pressures using the BaF₂ ex situ process

J. Yoo, K. J. Leonard, H. S. Hsu, L. Heatherly, F. A. List, D. F. Lee, A. A. Gapud, P. M. Martin, S. Cook, M. Paranthaman, A. Goyal, D. M. Kroeger

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7 Scopus citations

Abstract

The growth of 0.9-1.0 μm thick YBa₂Cu₃O _7-δ (YBCO) films on biaxially textured Ni-3 at.% W (NiW) substrates using the BaF₂ ex situ process was investigated at reduced pressures. By varying the water vapour pressure (P_H2O), Y-BaF ₂-Cu-O (YBFCO) precursor films deposited by e-beam co-evaporation were converted at a reduced total pressure (P_total) of 50-55 Torr and conversion temperature (T_S) of 740°C for a wet conversion time (t_W) of 60 min. Critical current density (J_C) values greater than 1 MA cm^-2 for the thick YBCO films were obtained under the condition of varying P_H2O from low pressure to 10 Torr. The transition temperatures (T_C) of the samples were over 90 K with ΔT_C = 1.8-2.5 K. Pre-heat treatment of the precursor films on CeO₂/YSZ/Y₂O₃/Ni/NiW substrates under an O ₂ atmosphere condition before the conversion resulted in smooth surfaces without large secondary phase particles embedded in the films.

Original language	English
Pages (from-to)	1209-1214
Number of pages	6
Journal	Superconductor Science and Technology
Volume	17
Issue number	10
DOIs	https://doi.org/10.1088/0953-2048/17/10/023
State	Published - Oct 2004

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Yoo, J., Leonard, K. J., Hsu, H. S., Heatherly, L., List, F. A., Lee, D. F., Gapud, A. A., Martin, P. M., Cook, S., Paranthaman, M., Goyal, A., & Kroeger, D. M. (2004). The growth of YBCO films with high critical current at reduced pressures using the BaF₂ ex situ process. Superconductor Science and Technology, 17(10), 1209-1214. https://doi.org/10.1088/0953-2048/17/10/023

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title = "The growth of YBCO films with high critical current at reduced pressures using the BaF2 ex situ process",

abstract = "The growth of 0.9-1.0 μm thick YBa2Cu3O 7-δ (YBCO) films on biaxially textured Ni-3 at.% W (NiW) substrates using the BaF2 ex situ process was investigated at reduced pressures. By varying the water vapour pressure (PH2O), Y-BaF 2-Cu-O (YBFCO) precursor films deposited by e-beam co-evaporation were converted at a reduced total pressure (Ptotal) of 50-55 Torr and conversion temperature (TS) of 740°C for a wet conversion time (tW) of 60 min. Critical current density (JC) values greater than 1 MA cm-2 for the thick YBCO films were obtained under the condition of varying PH2O from low pressure to 10 Torr. The transition temperatures (TC) of the samples were over 90 K with ΔTC = 1.8-2.5 K. Pre-heat treatment of the precursor films on CeO2/YSZ/Y2O3/Ni/NiW substrates under an O 2 atmosphere condition before the conversion resulted in smooth surfaces without large secondary phase particles embedded in the films.",

author = "J. Yoo and Leonard, {K. J.} and Hsu, {H. S.} and L. Heatherly and List, {F. A.} and Lee, {D. F.} and Gapud, {A. A.} and Martin, {P. M.} and S. Cook and M. Paranthaman and A. Goyal and Kroeger, {D. M.}",

year = "2004",

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doi = "10.1088/0953-2048/17/10/023",

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T1 - The growth of YBCO films with high critical current at reduced pressures using the BaF2 ex situ process

AU - Yoo, J.

AU - Leonard, K. J.

AU - Hsu, H. S.

AU - Heatherly, L.

AU - List, F. A.

AU - Lee, D. F.

AU - Gapud, A. A.

AU - Martin, P. M.

AU - Cook, S.

AU - Paranthaman, M.

AU - Goyal, A.

AU - Kroeger, D. M.

PY - 2004/10

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N2 - The growth of 0.9-1.0 μm thick YBa2Cu3O 7-δ (YBCO) films on biaxially textured Ni-3 at.% W (NiW) substrates using the BaF2 ex situ process was investigated at reduced pressures. By varying the water vapour pressure (PH2O), Y-BaF 2-Cu-O (YBFCO) precursor films deposited by e-beam co-evaporation were converted at a reduced total pressure (Ptotal) of 50-55 Torr and conversion temperature (TS) of 740°C for a wet conversion time (tW) of 60 min. Critical current density (JC) values greater than 1 MA cm-2 for the thick YBCO films were obtained under the condition of varying PH2O from low pressure to 10 Torr. The transition temperatures (TC) of the samples were over 90 K with ΔTC = 1.8-2.5 K. Pre-heat treatment of the precursor films on CeO2/YSZ/Y2O3/Ni/NiW substrates under an O 2 atmosphere condition before the conversion resulted in smooth surfaces without large secondary phase particles embedded in the films.

AB - The growth of 0.9-1.0 μm thick YBa2Cu3O 7-δ (YBCO) films on biaxially textured Ni-3 at.% W (NiW) substrates using the BaF2 ex situ process was investigated at reduced pressures. By varying the water vapour pressure (PH2O), Y-BaF 2-Cu-O (YBFCO) precursor films deposited by e-beam co-evaporation were converted at a reduced total pressure (Ptotal) of 50-55 Torr and conversion temperature (TS) of 740°C for a wet conversion time (tW) of 60 min. Critical current density (JC) values greater than 1 MA cm-2 for the thick YBCO films were obtained under the condition of varying PH2O from low pressure to 10 Torr. The transition temperatures (TC) of the samples were over 90 K with ΔTC = 1.8-2.5 K. Pre-heat treatment of the precursor films on CeO2/YSZ/Y2O3/Ni/NiW substrates under an O 2 atmosphere condition before the conversion resulted in smooth surfaces without large secondary phase particles embedded in the films.

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U2 - 10.1088/0953-2048/17/10/023

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SN - 0953-2048

VL - 17

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EP - 1214

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

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ER -

The growth of YBCO films with high critical current at reduced pressures using the BaF₂ ex situ process

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