Investigation of the melt-growth process of YbBa 2 Cu 3 O 7-: δ powder in Ag-sheathed tapes

  • Zili Zhang
  • , Jianyi Jiang
  • , Hui Tian
  • , Qiuliang Wang
  • , David C. Larbalestier
  • , Eric E. Hellstrom

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We investigated the melt-growth behavior of YbBa 2 Cu 3 O 7-δ (Yb123) powder under different atmospheres for potential application in Ag-sheathed Yb123 wires. We chose Yb123 because it has the lowest melting temperature of the RE123 (RE = rare earth) phases. Yb123 needs to be melted under low oxygen partial pressure (pO 2 ) to depress its melt temperature below that of Ag. Here we report that adding Ag powder to Yb123 powder or encasing Yb123 powder in a Ag-sheath further decreases the melting temperature of Yb123. We designed a heat treatment process in which we varied the pO 2 during the heat treatment to melt the Yb123 in a Ag-sheathed powder-in-tube (PIT) wire and then regrow Yb123 on cooling. Based on these studies, we have developed a model for Yb123 melting and growth.

Original languageEnglish
Pages (from-to)1369-1377
Number of pages9
JournalCrystEngComm
Volume21
Issue number9
DOIs
StatePublished - 2019

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