A method for improving nucleation of thick YBCO films in the ex-situ process

Vyacheslav F. Solovyov; Harold J. Wiesmann; Li Jun Wu; Yimei Zhu; Masaki Suenaga; D. Norton; K. R. Marken

doi:10.1109/TASC.2003.811824

A method for improving nucleation of thick YBCO films in the ex-situ process

Vyacheslav F. Solovyov
, Harold J. Wiesmann
, Li Jun Wu
, Yimei Zhu
, Masaki Suenaga
, D. Norton
, K. R. Marken

Center for Advanced Technology in Integrated Electrical Energy Systems

Brookhaven National Laboratory
University of Florida
Oxford Instruments Group Plc

Research output: Contribution to journal › Conference article › peer-review

7 Scopus citations

Abstract

Some coated conductor applications require a YBCO layer at least 5 μm thick with high J_c. The growth of thick c-axis oriented epitaxial layers using the barium fluoride ex-situ technology is not always possible. Films over 3 μm thick have more undesirable a-oriented and random grains than thinner ones. We present an analysis of thick film nucleation and conclude that thick precursor layers impede out-diffusion of the ex-situ reaction product, H F. High impedance for H F diffusion results in large variations of the chemical potential of the growth reaction and disruption of the nucleation process. We conclude that a solution for c-axis growth is control of the precursor permeability. A method is described for controlling the permeability of precursor layers. Using this technique we were able to grow c-axis oriented 5-μm thick films on oxide-buffered Ni tape with J_c(0 T) = 4 × 10⁵ A/cm² and J _c(1 T) = 8 × 10⁴ A/cm².

Original language	English
Pages (from-to)	2474-2476
Number of pages	3
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2 III
DOIs	https://doi.org/10.1109/TASC.2003.811824
State	Published - Jun 2003
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: Aug 4 2002 → Aug 9 2002

Keywords

Barium fluoride process
Coated conductors
YBCO

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10.1109/TASC.2003.811824

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@article{994eda301137436e828a07bd4d5de641,

title = "A method for improving nucleation of thick YBCO films in the ex-situ process",

abstract = "Some coated conductor applications require a YBCO layer at least 5 μm thick with high Jc. The growth of thick c-axis oriented epitaxial layers using the barium fluoride ex-situ technology is not always possible. Films over 3 μm thick have more undesirable a-oriented and random grains than thinner ones. We present an analysis of thick film nucleation and conclude that thick precursor layers impede out-diffusion of the ex-situ reaction product, H F. High impedance for H F diffusion results in large variations of the chemical potential of the growth reaction and disruption of the nucleation process. We conclude that a solution for c-axis growth is control of the precursor permeability. A method is described for controlling the permeability of precursor layers. Using this technique we were able to grow c-axis oriented 5-μm thick films on oxide-buffered Ni tape with Jc(0 T) = 4 × 105 A/cm2 and J c(1 T) = 8 × 104 A/cm2.",

keywords = "Barium fluoride process, Coated conductors, YBCO",

author = "Solovyov, \{Vyacheslav F.\} and Wiesmann, \{Harold J.\} and Wu, \{Li Jun\} and Yimei Zhu and Masaki Suenaga and D. Norton and Marken, \{K. R.\}",

year = "2003",

month = jun,

doi = "10.1109/TASC.2003.811824",

language = "English",

volume = "13",

pages = "2474--2476",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

number = "2 III",

note = "2002 Applied Superconductivity Conference ; Conference date: 04-08-2002 Through 09-08-2002",

}

TY - JOUR

T1 - A method for improving nucleation of thick YBCO films in the ex-situ process

AU - Solovyov, Vyacheslav F.

AU - Wiesmann, Harold J.

AU - Wu, Li Jun

AU - Zhu, Yimei

AU - Suenaga, Masaki

AU - Norton, D.

AU - Marken, K. R.

PY - 2003/6

Y1 - 2003/6

N2 - Some coated conductor applications require a YBCO layer at least 5 μm thick with high Jc. The growth of thick c-axis oriented epitaxial layers using the barium fluoride ex-situ technology is not always possible. Films over 3 μm thick have more undesirable a-oriented and random grains than thinner ones. We present an analysis of thick film nucleation and conclude that thick precursor layers impede out-diffusion of the ex-situ reaction product, H F. High impedance for H F diffusion results in large variations of the chemical potential of the growth reaction and disruption of the nucleation process. We conclude that a solution for c-axis growth is control of the precursor permeability. A method is described for controlling the permeability of precursor layers. Using this technique we were able to grow c-axis oriented 5-μm thick films on oxide-buffered Ni tape with Jc(0 T) = 4 × 105 A/cm2 and J c(1 T) = 8 × 104 A/cm2.

AB - Some coated conductor applications require a YBCO layer at least 5 μm thick with high Jc. The growth of thick c-axis oriented epitaxial layers using the barium fluoride ex-situ technology is not always possible. Films over 3 μm thick have more undesirable a-oriented and random grains than thinner ones. We present an analysis of thick film nucleation and conclude that thick precursor layers impede out-diffusion of the ex-situ reaction product, H F. High impedance for H F diffusion results in large variations of the chemical potential of the growth reaction and disruption of the nucleation process. We conclude that a solution for c-axis growth is control of the precursor permeability. A method is described for controlling the permeability of precursor layers. Using this technique we were able to grow c-axis oriented 5-μm thick films on oxide-buffered Ni tape with Jc(0 T) = 4 × 105 A/cm2 and J c(1 T) = 8 × 104 A/cm2.

KW - Barium fluoride process

KW - Coated conductors

KW - YBCO

UR - https://www.scopus.com/pages/publications/0042476481

U2 - 10.1109/TASC.2003.811824

DO - 10.1109/TASC.2003.811824

M3 - Conference article

AN - SCOPUS:0042476481

SN - 1051-8223

VL - 13

SP - 2474

EP - 2476

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2 III

T2 - 2002 Applied Superconductivity Conference

Y2 - 4 August 2002 through 9 August 2002

ER -

A method for improving nucleation of thick YBCO films in the ex-situ process

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Keywords

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