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Influence of morphology and texture of CeO2 on YBa2Cu3O7 (YBCO) growth and BaCeO3 formation in solution-derived synthesis

Nigel Van de Velde UGent, Tom Bruggeman UGent, Lander Stove, Glenn Pollefeyt UGent, Oliver Brunkahl and Isabel Van Driessche UGent (2012) EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. p.1186-1194
abstract
When working with chemical solution deposition techniques, one of the main issues for optimal performance of CeO2 buffer layers in coated conductors is the insufficient chemical stability of the CeO2 layer during YBa2Cu3O7 (YBCO) thermal processing. This work focusses on the morphology and nanostructure in thin CeO2 films prepared by means of a novel aqueous synthesis route and incorporated into a Ni-W/La2Zr2O7/CeO2/YBa2Cu3O7-coated conductor. Optimization of precursor chemistry and thermal processing led to a reduction in barium cerate formation. In a new precursor design, iminodiacetic acid was used as a stabilizing ligand, which resulted in an improved morphology of the buffer layer. A shelf life of more than 6 months was established by using a metal-to-ligand ratio of 1 to 5. During thermal pro-cessing, a combination of a slow calcination ramp with a high sintering ramp, short sintering dwell time and a low oxygen partial pressure during the synthesis resulted in a root mean square roughness below 3 nm for AFM analysis, a [111] to [002] ratio of 1 to 90 in X-ray diffraction and well-defined atterns in reflection high-energy electron diffraction (RHEED) analysis of the CeO2 surface. Trifluoroacetate-YBCO was deposited on top of the CeO2 buffer layer. Cross-section analysis with a focussed ion beam allowed us to correlate the morphology and nanostructure of the CeO2 buffer layer with the formation of BaCeO3 and the appearance of voids and secondary phases throughout the YBa2Cu3O7 layer.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Layered compounds, Superconductors, Cerium dioxide, Nanostructures, Surface morphology, CHEMICAL SOLUTION DEPOSITION, COATED CONDUCTORS, BUFFER LAYERS, THIN-FILMS, ROUTE
journal title
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Eur. J. Inorg. Chem.
issue
8
pages
1186 - 1194
Web of Science type
Article
Web of Science id
000301494000005
JCR category
CHEMISTRY, INORGANIC & NUCLEAR
JCR impact factor
3.12 (2012)
JCR rank
11/43 (2012)
JCR quartile
2 (2012)
ISSN
1434-1948
DOI
10.1002/ejic.201100951
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2010202
handle
http://hdl.handle.net/1854/LU-2010202
date created
2012-01-31 17:01:28
date last changed
2012-05-22 11:13:09
@article{2010202,
  abstract     = {When working with chemical solution deposition techniques, one of the main issues for optimal performance of CeO2 buffer layers in coated conductors is the insufficient chemical stability of the CeO2 layer during YBa2Cu3O7 (YBCO) thermal processing. This work focusses on the morphology and nanostructure in thin CeO2 films prepared by means of a novel aqueous synthesis route and incorporated into a Ni-W/La2Zr2O7/CeO2/YBa2Cu3O7-coated conductor. Optimization of precursor chemistry and thermal processing led to a reduction in barium cerate formation. In a new precursor design, iminodiacetic acid was used as a stabilizing ligand, which resulted in an improved morphology of the buffer layer. A shelf life of more than 6 months was established by using a metal-to-ligand ratio of 1 to 5. During thermal pro-cessing, a combination of a slow calcination ramp with a high sintering ramp, short sintering dwell time and a low oxygen partial pressure during the synthesis resulted in a root mean square roughness below 3 nm for AFM analysis, a [111] to [002] ratio of 1 to 90 in X-ray diffraction and well-defined atterns in reflection high-energy electron diffraction (RHEED) analysis of the CeO2 surface. Trifluoroacetate-YBCO was deposited on top of the CeO2 buffer layer. Cross-section analysis with a focussed ion beam allowed us to correlate the morphology and nanostructure of the CeO2 buffer layer with the formation of BaCeO3 and the appearance of voids and secondary phases throughout the YBa2Cu3O7 layer.},
  author       = {Van de Velde, Nigel and Bruggeman, Tom and Stove, Lander and Pollefeyt, Glenn and Brunkahl, Oliver and Van Driessche, Isabel},
  issn         = {1434-1948},
  journal      = {EUROPEAN JOURNAL OF INORGANIC CHEMISTRY},
  keyword      = {Layered compounds,Superconductors,Cerium dioxide,Nanostructures,Surface morphology,CHEMICAL SOLUTION DEPOSITION,COATED CONDUCTORS,BUFFER LAYERS,THIN-FILMS,ROUTE},
  language     = {eng},
  number       = {8},
  pages        = {1186--1194},
  title        = {Influence of morphology and texture of CeO2 on YBa2Cu3O7 (YBCO) growth and BaCeO3 formation in solution-derived synthesis},
  url          = {http://dx.doi.org/10.1002/ejic.201100951},
  year         = {2012},
}

Chicago
Van de Velde, Nigel, Tom Bruggeman, Lander Stove, Glenn Pollefeyt, Oliver Brunkahl, and Isabel Van Driessche. 2012. “Influence of Morphology and Texture of CeO2 on YBa2Cu3O7 (YBCO) Growth and BaCeO3 Formation in Solution-derived Synthesis.” European Journal of Inorganic Chemistry (8): 1186–1194.
APA
Van de Velde, N., Bruggeman, T., Stove, L., Pollefeyt, G., Brunkahl, O., & Van Driessche, I. (2012). Influence of morphology and texture of CeO2 on YBa2Cu3O7 (YBCO) growth and BaCeO3 formation in solution-derived synthesis. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, (8), 1186–1194.
Vancouver
1.
Van de Velde N, Bruggeman T, Stove L, Pollefeyt G, Brunkahl O, Van Driessche I. Influence of morphology and texture of CeO2 on YBa2Cu3O7 (YBCO) growth and BaCeO3 formation in solution-derived synthesis. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2012;(8):1186–94.
MLA
Van de Velde, Nigel, Tom Bruggeman, Lander Stove, et al. “Influence of Morphology and Texture of CeO2 on YBa2Cu3O7 (YBCO) Growth and BaCeO3 Formation in Solution-derived Synthesis.” EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 8 (2012): 1186–1194. Print.