Microstructural studies of the effect of heat-treatment on Bi,Pb-2223 films prepared by RF sputtering

Yusuke Shimada, Takato Kajihara, Satoshi Hata, Ken Ichi Ikeda, Hideharu Nakashima, Akiyoshi Matsumoto, Hitoshi Kitaguchi, Toshiya Doi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The uniform single phase Bi,Pb-2223 films are needed in order to acquire fundamental superconductivity data for the development of Bi,Pb-2223 wires. However, Bi,Pb-2223 films that we previously reported had the non-uniform microstructure containing several other phases. In this study we investigated the microstructural evolution during the heat treatment and processing route to fabricate uniform Bi,Pb-2223 films elucidated. An as-grown film had a small amount of Bi-2223 phase and a large amount of Ca-Sr-Cu-O phase. C-axes of some Bi-2223 crystals are not aligned along the normal direction of the STO substrate. In the primary stage of heat treatment, the formation of Bi,Pb-2223 phase proceeds. In the second stage of heat treatment, although the flat Cu-O layers in the Bi,Pb-2223 phase are formed by liquid-phase reactions, the grain coarsening of Ca-Sr-Cu-O phase also occurs. From the observation results, the fabrication process should be optimized based on the following points: uniform dispersion of penetration (diffusion) paths of Pb atoms into the film; short duration of heat treatment to avoid phase separation of Bi,Pb-2223 and coarsening of Ca-Sr-Cu-O phase.

Original languageEnglish
Article number6990598
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - Jun 1 2015

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Sputtering
heat treatment
sputtering
Heat treatment
Coarsening
Microstructural evolution
Superconductivity
Phase separation
liquid phases
superconductivity
penetration
routes
wire
Wire
Fabrication
Atoms
Crystals
microstructure
Microstructure
fabrication

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructural studies of the effect of heat-treatment on Bi,Pb-2223 films prepared by RF sputtering. / Shimada, Yusuke; Kajihara, Takato; Hata, Satoshi; Ikeda, Ken Ichi; Nakashima, Hideharu; Matsumoto, Akiyoshi; Kitaguchi, Hitoshi; Doi, Toshiya.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6990598, 01.06.2015.

Research output: Contribution to journalArticle

Shimada, Yusuke ; Kajihara, Takato ; Hata, Satoshi ; Ikeda, Ken Ichi ; Nakashima, Hideharu ; Matsumoto, Akiyoshi ; Kitaguchi, Hitoshi ; Doi, Toshiya. / Microstructural studies of the effect of heat-treatment on Bi,Pb-2223 films prepared by RF sputtering. In: IEEE Transactions on Applied Superconductivity. 2015 ; Vol. 25, No. 3.
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