High Performance Coated Conductors Fabricated by UTOC-MOD Process

Teruo Izumi, Koichi Nakaoka, Michio Sato, Takato MacHi, Akira Ibi, Ryuji Yoshida, Takeharu Kato, Masashi Miura, Takanobu Kiss, Masayoshi Inoue

Research output: Contribution to journalArticle

Abstract

A new metal organic deposition (MOD) process using precursor solution containing metal trifluoroacetates was developed to improve in-field performance. In this process, the pinning centers of BaMO3 (M: metal elements such as Zr and Hf) materials could be made to be finer by reducing the once coating thickness in the coating and calcination step. This is referred to as the ultra-thin once coating (UTOC)-MOD process. This process improves the in-field performance. The UTOC-MOD process also has the advantage of uniformity of 2-dimensional Jc-distribution, which was determined using a scanning hall-probe microscopy analysis. Improvement of the Jc uniformity was also confirmed based on scribed tapes. A smaller dispersion of the filament-critical current values in the UTOC-MOD tape was determined based on a comparison with the results for obtained by a conventional process. With respect to the mechanical strength, it was established that the dispersion of the delamination strength, which was evaluated using stud-pull equipment, was suppressed. Microstructural analysis revealed that, the UTOC films were pore-free, although large pores are present in the films when conventional MOD is utilized. This difference in the microstructure can be attributed to the aforementioned improvement in the uniformity of the UTOC-MOD films.

Original languageEnglish
Article number8710275
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - Aug 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Izumi, T., Nakaoka, K., Sato, M., MacHi, T., Ibi, A., Yoshida, R., Kato, T., Miura, M., Kiss, T., & Inoue, M. (2019). High Performance Coated Conductors Fabricated by UTOC-MOD Process. IEEE Transactions on Applied Superconductivity, 29(5), [8710275]. https://doi.org/10.1109/TASC.2019.2908241