This document summarizes a student's research project on preparing thin films of rare earth barium copper oxide superconductors. The student describes their laboratory and supervisors, provides background on superconductors and the target materials, and details their experiments preparing Y124 and Yb124 films using metal organic deposition and analyzing the results with X-ray diffraction. Their conclusions are that while Y124 phase was not observed, the Yb124 phase was observed after annealing at 800°C for 24 hours, and that the Yb124 film prepared using MOD had similar quality to one prepared using pulsed laser deposition.

1. Preparation thin film of REBa2Cu4O8(RE=Y,Yb)
by MOD method
Shoma AOYAGI
Supervisor : Kaname MATSUMOTO
Tomoya HORIDE
Masahiro YAMANE
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2. Outline
・ my lab
・ back ground
・ experimental
・ conclusion
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3. My Lab
(Thin Films of Super-conductor Layer)
No
Photo
Prof. Kaname MATSUMOTO
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Photo
at soft-ball match
We were the champion
summer2013!
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Photo
As.Prof. Tomoya HORIDE
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Photo
As.Prof. Masahiro YAMANE
Fig.1 MRI by super-conductor
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http://www.toshiba.co.jp/design/pr/ud/living03.htm

4. Back ground
What is Super-conductor ?
→indicating zero critical resistance
below some temperature(Tc)
→ loss of energy is zero
Fig.2 electricity cable
e-onodera.blog.so-net.ne.jp
For instance, amount lost electricity energy of all
Japan..…5%
France…7%
http://www.fepc.or.jp/library/words/keiei/shihyou/gainen/1225633_4545.html
Typical material
・ Y oxide ・ Bi oxide
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5. Back ground
Y oxide (Y-Ba-Cu-O)
・ RE123 ・ RE124(New)
About RE124 compared to RE123
○…increasing Tc by treatments
×…making RE124 phase is difficult
Phase graph of Y-Ba-Cu-O
RE124
RE123
J. Karpinski et al., Solid State Ionics, 101-103 (1997) 985-990
Table.1 c-axis length of RE123 and RE124
c-axis
length(Å)
ex-site method
Precursor → Phase
RE123
RE124
Y
11.680
27.252
Yb
11.658
27.299
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6. Back ground(PLD method)
Y2O3(Yb2O3)+0.2MCH3COOH
Mix at 60℃
Ba(CH3COO)2 aqua. plus
Mix at 60℃
10 h firing at 780℃
Cu(CH3COO)2 ・ H2O aqua. plus
mix
Mix at 60℃
10 h firing at 780℃
acidum tartaricum aqua. plus
forming
Gel is made
30 h firing at 780℃
Drying at 80℃
A. Baranauskas et al., Vibrational Spectroscopy, 28 (1997) 263
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7. Back ground(MOD method)
Y(diluted by C7H8)
Cu(diluted by C7H8)
Ba(diluted by C7H8)
Mix at room tempertute
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8. Experimantal
making c-axis oriented single 124
How to pruduce
・・・ coating-pyrolysis process (spin-coating)
preanneal
anneal
(RE=Y,Yb)
Analyzing
・・・ XRD
θ-2θ scanning
→find out what is component
aqua
substrate
spin corter
spin
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9. Y124 precursor anneal effect （ XRD ）
STOpeak
Y123peak
Unknown peak
700℃ 時間
700℃ 1 1h
700℃ 24h
700℃ 24 時間
800℃ 1 1h
800℃ 時間
800℃ 24 時間
800℃ 24h
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10. Yb124 precursor anneal effect （ XRD ）
STOpeak
Yb124peak
Y123peak
Unknown peak
700℃ 1 時間
700℃ 1h
700℃ 24h
700℃ 24 時間
800℃ 時間
800℃ 1 1h
800℃ 24h
800℃ 24 時間
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11. Difference by method making precursor (XRD)
PLD
MOD
precursor(PLD)
→800℃ 、 24h
•(00n)Yb124 seen
•c=27.214Å
precursor(MOD)
→800℃ 、 24h
•(00n)Yb124 seen
•c=27.254Å
Same XRD pattern
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12. Conclusion
・ I made precursor of Y124 and Yb124 by MOD method.
・ Y124 has not been seen, however Yb124 has been seen.
・ Annealed at 800℃ for 24hours made Yb124,
both of MOD and PLD method.
・ Yb124 by MOD method seems has same quality
as one by PLD method.
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