[논문]Solid-liquid phase equilibria on the GdBa2Cu3O7-δ stability phase diagram in low oxygen pressures (1 - 100 mTorr)

Lee, J.W.; Lee, J.H.; Moon, S.H.; Yoo, S.I.

doi:10.9714/sac.2012.14.4.028

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

한국초전도·저온공학회논문지 = Superconductivity and cryogenics, v.14 no.4, 2012년, pp.28 - 31

Lee, J.W. (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University) , Lee, J.H. (Superconductor, Nano & Advanced Materials Corporation (SuNAM Co.) Ltd.) , Moon, S.H. (Superconductor, Nano & Advanced Materials Corporation (SuNAM Co.) Ltd.) , Yoo, S.I. (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)

Abstract ▼ AI-Helper

We report the solid-liquid phase equilibria on the $GdBa_2Cu_3O_{7-{\delta}}$ (GdBCO) stability phase diagram in low oxygen pressures ($PO_2$) ranging from 1 to 100 mTorr. On the basis of the GdBCO stability phase diagram experimentally determined in low oxygen pressures, the isothermal sections of three different phase fields on log $PO_2$ vs. 1/T diagram were schematically constructed within the $Gd_2O_3-Ba_2CuO_y-Cu_2O$ ternary system, and the solid-liquid phase equilibria in each phase field were described. The invariant points on the phase boundaries include the following three reactions; a pseudobinary peritectic reaction of $GdBCO{\leftrightarrow}Gd_2O_3$ + liquid ($L_1$), a ternary peritectic reaction of $GdBCO{\leftrightarrow}Gd_2O_3+GdBa_6Cu_3O_y$ + liquid ($L_2$), and a monotectic reaction of $L_1{\leftrightarrow}GdBa_6Cu_3O_y+L_2$. A conspicuous feature of the solid-liquid phase equilibria in low $PO_2$ regime (1 - 100 mTorr) is that the GdBCO phase is decomposed into $Gd_2O_3+L_1$ or $Gd_2O_3+GdBa_6Cu_3O_y+L_2$ rather than $Gd_2BaCuO_5+L$ well-known in high $PO_2$ like air.

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Although several papers on the equilibrium solid-liquid phase relations for the RE-Ba-Cu-O systems (RE = Y and rare earth elements) [6-9] have been reported, the solid-liquid phase equilibria around the GdBCO phase has never been reported in low PO₂ regime yet, which is the motivation of this study. In this report, on the basis of the GdBCO stability phase diagram experimentally determined in low oxygen pressures [10], we schematically constructed the isothermal sections of three different phase fields on log PO₂ vs. 1/T diagram in the Gd₂O₃-Ba₂CuO_y-Cu₂O ternary system, and discussed the solid-liquid phase equilibria around the GdBCO phase.

참고문헌 (13)

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J.W. Lee, S. M. Choi, J. H. Lee, S. H. Moon, and S. I. Yoo, to be submitted.
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J. K. R. Weber, P. C. Nordine, K. C. Goretta, and R. B. Poeppel, "Effects of oxygen-pressure on the structure of Y-Ba-Cu-O materials formed by containerless melting and solidification," Journal of Materials Research, vol. 9, pp. 1657-1660, Jul. 1994.

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

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

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