http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Shin, Geo-Myung,Lee, Jung-Woo,Choi, Soon-Mi,Moon, Seung-Hyun,Yoo, Sang-Im Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>We report the effects of barium-based perovskite particle inclusions of BaCeO<SUB>3</SUB> (BCO), BaZrO<SUB>3</SUB> (BZO), and YBa<SUB>2</SUB>SnO<SUB>5.5</SUB> (YBSO) on the thickness dependence of critical current density <inline-formula> <TEX-math notation='LaTeX'>$(J_c)$</tex-math></inline-formula> in metal organic deposition (MOD) -processed <inline-formula> <TEX-math notation='LaTeX'><TEX>$\mbox{YBa}_2\mbox{Cu}_3\mbox{O}_{7-\delta} $</TEX></tex-math></inline-formula> (YBCO) films on the SrTiO<SUB>3</SUB> (STO) single-crystal substrate. With increasing film thickness, while BZO-doped YBCO films show a serious degradation in <inline-formula> <TEX-math notation='LaTeX'><TEX>$J_\mathrm{c} $</TEX></tex-math></inline-formula>, caused by the interlayer at the boundaries of multicoated layers, BCO- and YBSO- doped films exhibit a significant enhancement of <inline-formula> <TEX-math notation='LaTeX'>$J_c$</tex-math></inline-formula> (77 K, self-field) over ∼1 μm thickness even though BCO- or YBSO-doped YBCO films have degraded <I>in-plane</I> textures compared with undoped films, implying that these perovskite dopants affect not only the pinning properties but also the growth of multicoated layers. The highest critical current <inline-formula> <TEX-math notation='LaTeX'><TEX>$(I_\mathrm{c} )$</TEX></tex-math></inline-formula> value over 440 A/cm-width, corresponding to <inline-formula> <TEX-math notation='LaTeX'><TEX>$J_\mathrm{c} $</TEX></tex-math></inline-formula> value of 1.8 MA/cm<SUP>2</SUP>, was obtained from the 2.4-<inline-formula> <TEX-math notation='LaTeX'><TEX>$\mu\mathrm{m}$</TEX></tex-math></inline-formula>-thick YBSO-doped film.</P>
MOD-Processed SmBCO Films on <tex> ${\rm LaAlO}_{3}$</tex> (100) Substrates
Geo-Myung Shin,Duck-Jin Kim,Kyu-Jeong Song,Chan Park,Seung-Hyun Moon,Sang-Im Yoo Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>SmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-delta</SUB>(SmBCO) thin films were successfully prepared on the LaAlO<SUB>3</SUB>(100) substrate by the TFA-MOD method in an extremely reduced oxygen atmosphere. The precursor solution was prepared dissolving SmBCO powder into the trifluoroacetic acid solution. The precursor solution was spin-coated on the LaAlO<SUB>3</SUB>(100) single crystalline substrates, calcined at the temperature up to 400degC, and fired at various high temperatures for 2 h in reduced oxygen atmospheres. Optimally processed SmBCO thin film exhibited T<SUB>C,zero</SUB> value of 90.2 K and J<SUB>C</SUB> value of 0.8 MA/cm<SUP>2</SUP> at 77 K, respectively. Relatively lower J<SUB>C</SUB> values in SmBCO films compared with MOD-processed YBCO films are attributed to the existence of a-axis oriented grains.</P>
MOD-processed YBCO coated conductor on the IBAD-MgO template
Shin, Geo-Myung,Ko, Rock-Kil,Song, Kyu-Jeong,Yoo, Jai-Moo,Oh, Sang-Soo,Moon, Seung-Hyun,Yoo, Sang-Im The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
We report the results of MOD-processed YBCO coated conductors on the IBAD-MgO template. The precursor solution was coated on the $CeO_2-buffered$ IBAD-MgO template using a slot-die coating method, calcined at a temperature of $550^{\circ}C$, and fired at high temperatures for 2.5 h in a reduced oxygen atmosphere. The $J_C$ value of YBCO coated conductors was found to be very sensitive to the microstructure, and thus higher $J_C$ value could be achieved when the in-plane texture was higher and the difference in $T_{C,zero}$. was negligible. Optimally processed YBCO coated conductor exhibited $J_C$ value of $0.75MA/cm^2$ at 77 K in self-field, which might be due to somewhat depressed $T_{C,zero}$ of 87.3 K caused by possible $Sm^{3+}$ substitution on the $Ba^{2+}$ site.
Phase and microstructure evolution during the TFA-MOD process of YBCO films
Wee, Sung-Hun,Shin, Geo-Myung,Hong, Gye-Won,Yoo, Sang-Im The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.2
We report the phase and microstructure evolutions of metal trifluoroacetate (TFA) precursor films in the TFA-MOD process of YBCO films on the LAO (100) substrates. It was confirmed that the precursor films were decomposed into $Y_2O_3$, $BaF_2$, and CuO nanoparticles after the initial heat treatment up to 400$^{\circ}C$. After a subsequent heat treatment at higher temperatures ranging from 700 to 850$^{\circ}C$ for 2 h, these nano-sized phases are converted into YBCO films. High Jc(77K, sf)-YBCO thin films (over 2 MA/$cm^2$) were successfully fabricated with firing temperatures ranging from 775 to 850$^{\circ}C$ for 2 h, where films were composed of dense microstructures with large grains.
Fabrication of YBCO films on metal tapes by the TFA-MOD process
신거명,송규정,박찬,문승현,유상임,Shin Geo-Myung,Song Kyu-Jung,Park Chan,Moon Seung-Hyun,Yoo Sang-Im The Korean Superconductivity Society 2005 Progress in superconductivity Vol.7 No.1
YBCO thin films on metal substrates were prepared by the metal-organic deposition using trifluoroacetates (TFA-MOD). To compensate the loss of Ba element from the precursor films due to the reaction with $CeO_2$ cap layer, we have employed Ba-excessive precursor solutions of $YBa_{2+x}Cu_{3}O_{7-{\delta}}$ ($0{\le}x{\le}0.1$). The precursor solutions were dip-coated on the metal substrates with $CeO_2$ cap layer, initially heated up to $400^{\circ}C$, and finally fired at the various high temperatures for 2 h in a reduced oxygen atmosphere. With this approach, YBCO films possessing critical temperature over 85 K could be successfully prepared on the metal substrates. The highest $T_{c,zero}$ value of 86 K was obtained from the Ba-excessive YBCO film of x=0.005 in $YBa_{2+x}Cu_{3}O_{7-{\delta}}$ fired at $750^{\circ}C$ for 2 h. However, unexpected $T_c$ suppression even in Ba-excessive YBCO samples requires further identification.