Sm-doped YBCO Coated Conductor on the IBAD MgO Template Fabricated by MOD Process
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1001-M05-06
Sm-doped YBCO Coated Conductor on the IBAD MgO Template fabricated by MOD process Geo-Myung Shin1, Rock-Kil Ko2, Kyu-Jung Song2, Jae-Moo Yoo3, Chan Park1, Seung-Hyun Moon4, and Sang-Im Yoo1 1 Department of Materials Science & Engineering, Seoul National University, San 56-1, Shillimdong, Gwanak-gu, Seoul, 151-744, Korea, Republic of 2 Superconducting Material Research Group, Korea Electrotechnology Research Institute, Changwon, 641-120, Korea, Republic of 3 High Temperature Superconducting Wire Laboratory, Korea Institute of Machinery & Materials, Changwon, 641-010, Korea, Republic of 4 SuNAM Co.,Ltd, Anyang, 430-018, Korea, Republic of ABSTRACT Metal organic deposition (MOD) is one of the attractive processes for coated conductor applications because it is a non-vacuum cost-effective process. Many research groups have successfully fabricated high-JC YBCO coated conductor on the RABiTS and IBAD-YSZ or GZO template with the MOD process. Reports on MOD-processed YBCO coated conductors prepared on the IBAD-MgO template, however, are hardly found. The precursor solution was coated on the CeO2 capped IBAD-MgO template using the slot-die coating method, calcined at a temperature of 550oC, and fired at high temperatures for 2 h 30 min in a reduced oxygen atmosphere. Optimal processing resulted in YBCO coated conductors exhibiting JC value of 0.75 MA/cm2 at 77 K in self-field. The JC values of YBCO coated conductors were found very sensitive to their microstructure, critical temperature, and in-plane texture. INTRODUCTION Many research groups process YBCO coated conductors by metal-organic deposition using trifluoroacetates (TFA-MOD). TFA-MOD process is basically non-vacuum and costeffective process for real applications compared with physical vapor deposition, such as pulsed laser deposition, e-beam co-evaporation, sputtering, and metal-organic chemical vapor deposition. In this respect, non-vacuum processes, including MOD and sol-gel, have drawn great attention as the promising alternatives [1,2]. Recently, by combining the TFA-MOD process with RABiTS and IBAD-GZO template, uniform YBCO coated conductors with IC > 150 A/cmwidth have been demonstrated over 50-m length [3,4]. Meanwhile, the use of MgO as an IBAD template has made great progress and decreased the time to produce the template compared with YSZ and GZO template [5]. With LaMnO3 as a buffer layer, high performance YBCO coated conductors have been reported over 100-m length by metal-organic chemical vapor deposition [6]. However, only a few reports for YBCO coated conductor on the IBAD-MgO template by the TFA-MOD process can be found [7]. In this study, we applied TFA-MOD process for YBCO coated conductor on the IBADMgO template, processing parameters were optimized to obtain high-JC YBCO film.
EXPERIMENT DETAILS Pulsed laser deposition was used to deposit 100 nm thick LaMnO3 buffer layer and 200 nm thick CeO2 cap layers on IBAD-MgO templates resulting in templates with a final architecture of CeO2/LaMnO3/IBAD-MgO/Hastelloy. The YBCO films on the
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