Microwave‐assisted YBa 2 Cu 3 O 7 precursors: A fast and reliable method towards chemical precursors for superconducting films
Abstract Highly stable, pure, and anhydrous organometallic YB a 2 Cu 3 O 7‐δ ( YBCO ) precursor solutions were prepared by dissolving commercial YBCO powder in acetone by trifluoroacetic anhydride ( TFAA ) or a mixture of TFAA with propionic acid for low fluorine precursors. It is shown that compare...
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Published in | Journal of the American Ceramic Society Vol. 100; no. 6; pp. 2407 - 2418 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.06.2017
|
Online Access | Get full text |
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Summary: | Abstract
Highly stable, pure, and anhydrous organometallic
YB
a
2
Cu
3
O
7‐δ
(
YBCO
) precursor solutions were prepared by dissolving commercial
YBCO
powder in acetone by trifluoroacetic anhydride (
TFAA
) or a mixture of
TFAA
with propionic acid for low fluorine precursors. It is shown that compared to conventional oil bath heating reported in literature, the reaction to produce
YBCO
precursor occurs 72 times faster by microwave heating. More importantly, the formation of byproducts is suppressed, as shown by nuclear magnetic resonance (
NMR
) and mass spectrometry (
MS
). This approach allows a highly reproducible preparation of superconducting coatings which is of interest for low‐cost manufacturing processes capable of large‐scale production of the coated conductors via chemical solution deposition (
CSD
). This technology requires reliable and stable precursor solutions for continuous deposition. In this work, we obtained
YBCO
thin films on single‐crystal substrates ((100)‐LaAlO
3
) with a high critical current density (
J
c
) of 3‐4 MA/cm² in self‐field at 77 K using
TFA
‐based
YBCO
precursors and
J
c
of 5‐6 MA/cm² using low fluorine
YBCO
precursors. |
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ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.14757 |