Solid-liquid phase equilibria on the GdBa2Cu3O7-δstability phase diagram in low oxygen pressures (1 - 100 mTorr)

Lee, J.W.; Lee, J. H.; Moon, Seung‐Hyun; Yoo, Sang‐Im

doi:10.9714/sac.2012.14.4.028

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…The monotectic reaction, L 1 ↔ L 2 + secondary phase, occurred in the GdBCO and SmBCO systems, whereas a complicated reaction Y 2 O 3 + YBa 3 Cu 2 O 6.5 (Y132) + L 1 ↔ Y211 + Y132 + L 2 occurred in the YBCO system. This result may be related to the stability of each secondary phase, namely, Y132, GdBa 6 Cu 3 O y (Gd163), and Sm 2 BaO 4 , and the solid− liquid phase equilibria 34 beyond the stability limit of REBCO. This hypothesis needs to be further investigated to determine the origin of the different types of decomposition reactions that occur under low PO 2 regimes.…”

Section: Smbcomentioning

confidence: 99%

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures

et al. 2023

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We experimentally determined the stability diagram of SmBa 2 Cu 3 O 7−δ (SmBCO) under a low oxygen pressure (PO 2 ) 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 PO 2 region and then quenched. Under a PO 2 of 20−100 mTorr, the stability line of SmBCO on the log PO 2 versus 1/T (K −1 ) diagram is expressed as log (PO 2 (Torr)) = 19.22− 24292/T (K), with a reaction of SmBCO ↔ Sm 2 BaO 4 + liquid (L 1 ). Under the PO 2 regime of 1−10 mTorr, the stability line of SmBCO is expressed as log (PO 2 (Torr)) = 17.73−22582/T (K), with a reaction of SmBCO ↔ Sm 2 BaO 4 + Sm 2 O 3 + L 2 . At the phase boundary between SmBCO ↔ Sm 2 BaO 4 + L 1 and SmBCO ↔ Sm 2 BaO 4 + Sm 2 O 3 + L 2 , the reaction of L 1 ↔ L 2 + Sm 2 O 3 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.

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Section: Smbcomentioning

confidence: 99%

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures

et al. 2023

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Strong pinning in very fast grown reactive co-evaporated GdBa2Cu3O7 coated conductors

et al. 2014

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We report on compositional tuning to create excellent field-performance of Jc in “self-doped,” GdBa2Cu3O7−y (GdBCO) coated conductors grown by ultrafast reactive co-evaporation. In order to give excess liquid and Gd2O3, the overall compositions were all Ba-poor and Cu-rich compared to GdBCO. The precise composition was found to be critical to the current carrying performance. The most copper-rich composition had an optimum self-field Jc of 3.2 MA cm−2. A more Gd-rich composition had the best in-field performance because of the formation of low coherence, splayed Gd2O3 nanoparticles, giving Jc (77 K, 1 T) of over 1 MA cm−2 and Jc (77 K, 5 T) of over 0.1 MA cm−2.

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New approaches for achieving more perfect transition metal oxide thin films

et al. 2020

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This perspective considers the enormous promise of epitaxial functional transition metal oxide thin films for future applications in low power electronic and energy applications since they offer wide-ranging and highly tunable functionalities and multifunctionalities, unrivaled among other classes of materials. It also considers the great challenges that must be overcome for transition metal oxide thin films to meet what is needed in the application domain. These challenges arise from the presence of intrinsic defects and strain effects, which lead to extrinsic defects. Current conventional thin film deposition routes often cannot deliver the required perfection and performance. Since there is a strong link between the physical properties, defects and strain, routes to achieving more perfect materials need to be studied. Several emerging methods and modifications of current methods are presented and discussed. The reasons these methods better address the perfection challenge are considered and evaluated.

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Solid-liquid phase equilibria on the GdBa₂Cu₃O_7-_δstability phase diagram in low oxygen pressures (1 - 100 mTorr)

Cited by 3 publications

References 10 publications

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures

Strong pinning in very fast grown reactive co-evaporated GdBa2Cu3O7 coated conductors

New approaches for achieving more perfect transition metal oxide thin films

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Solid-liquid phase equilibria on the GdBa2Cu3O7-δstability phase diagram in low oxygen pressures (1 - 100 mTorr)

Cited by 3 publications

References 10 publications

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

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

Strong pinning in very fast grown reactive co-evaporated GdBa2Cu3O7 coated conductors

New approaches for achieving more perfect transition metal oxide thin films

Contact Info

Product

Resources

About

Solid-liquid phase equilibria on the GdBa₂Cu₃O_7-_δstability phase diagram in low oxygen pressures (1 - 100 mTorr)

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures

Experimental Determination of SmBa₂Cu₃O_7−δ Stability Diagram at Low Oxygen Pressures