Experimental Determination of SmBa2Cu3O7−δ Stability Diagram at Low Oxygen Pressures

Jung Woo Lee, Joo Hyun Song, Insung Park, Wooyoung Lee, Sang Im Yoo

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Abstract

We experimentally determined the stability diagram of SmBa2Cu3O7−δ (SmBCO) under a low oxygen pressure (PO2) regime of 1-100 mTorr. Sm-Ba-Cu-O amorphous films were used as precursors instead of SmBCO powder in order to avoid oxygen release problem during decomposition of SmBCO. The precursor films were annealed at 780-932 °C at a given PO2 region and then quenched. Under a PO2 of 20-100 mTorr, the stability line of SmBCO on the log PO2 versus 1/T (K-1) diagram is expressed as log (PO2 (Torr)) = 19.22-24292/T (K), with a reaction of SmBCO ↔ Sm2BaO4 + liquid (L1). Under the PO2 regime of 1-10 mTorr, the stability line of SmBCO is expressed as log (PO2 (Torr)) = 17.73-22582/T (K), with a reaction of SmBCO ↔ Sm2BaO4 + Sm2O3 + L2. At the phase boundary between SmBCO ↔ Sm2BaO4 + L1 and SmBCO ↔ Sm2BaO4 + Sm2O3 + L2, the reaction of L1 ↔ L2 + Sm2O3 occurs. Based on the above relationship, the stability diagram of SmBCO, including the solid-liquid phase equilibria above its stability line, is accurately constructed, which is crucial for understanding the fundamental mechanism involved in the fabrication of SmBCO-based high-temperature superconducting coated conductors.

Original languageEnglish
Pages (from-to)1527-1535
Number of pages9
JournalJournal of Physical Chemistry C
Volume127
Issue number3
DOIs
Publication statusPublished - 2023 Jan 26

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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