Pellet-buffered film seed to grow single grain bulk YBCO

Chia Ming Yang, Chia Hao Liu, Bo Xiani Chen, Chin Wei Chang, In Gann Chen

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Epitaxial thin film seeds, exhibit a higher peritectic temperature than the bulk, have been recognized as a possible way to obtain large-sized single-grain REBCO bulks. Recently, use of a pellet as a buffer layer inserted between the film-seed and the main pellet has been reported. This approach can prevent Mg diffusion from the MgO substrate to the film seed, and enable the thin film to tolerate a higher maximum temperature in the TSMG (Top Seed Melt Growth) method. However, we found that the liquid phase decomposed from YBa2Cu3O7−x(YBCO) contacted the MgO substrate, due to surface tension, and caused undesirable grain nucleation. To resolve this problem, this study used a mini-pellet, smaller than the seed, as a buffer layer. This new technique can avoid the liquid phase contacting the MgO substrate, thereby allowing the YBCO single-grain bulk to be grown more easily. Moreover, the thin film seed can be re-used by removing the buffer layer after the crystal growing process.

Original languageEnglish
Pages (from-to)5038-5043
Number of pages6
JournalJournal of the American Ceramic Society
Volume100
Issue number11
DOIs
Publication statusPublished - 2017 Nov

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Pellet-buffered film seed to grow single grain bulk YBCO'. Together they form a unique fingerprint.

Cite this