Experimental Determination of SmBa2Cu3O7−δ Stability Diagram at Low Oxygen Pressures
- Authors
- Lee, J.-W.; Song, J.-H.; Park, I.; Lee, W.; Yoo, S.-I.
- Issue Date
- 26-Jan-2023
- Publisher
- American Chemical Society
- Citation
- Journal of Physical Chemistry C, v.127, no.3, pp 1527 - 1535
- Pages
- 9
- Journal Title
- Journal of Physical Chemistry C
- Volume
- 127
- Number
- 3
- Start Page
- 1527
- End Page
- 1535
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/32679
- DOI
- 10.1021/acs.jpcc.2c03070
- ISSN
- 1932-7447
1932-7455
- 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. © 2023 American Chemical Society.
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