Journal Article10.1111/J.1151-2916.1994.TB05361.X
Stability Diagram for the System Yba2Cu3O7–x
Jung-Sik Kim,David R. Gaskell +1 more
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TL;DR: The dependence of the degree of nonstoichiometry of YBa2Cu307x (123) on temperature and oxygen pressure has been determined by thermogravimetric analysis (TGA) in the temperature range 400° to 950°C and the oxygen pressure range 10−6 to 1 atm (1 atm = 105 Pa) as mentioned in this paper.
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Abstract: The dependence of the degree of nonstoichiometry of YBa2Cu307–x (123) on temperature and oxygen pressure has been determined by thermogravimetric analysis (TGA) in the temperature range 400° to 950°C and the oxygen pressure range 10–6 to 1 atm (1 atm = 105 Pa). The nature of the decomposition of 123 in the temperature range 750° to 950°C and the oxygen pressure range 10–6 to 10–2 atm has been determined by TGA and X-ray diffractometry (XRD). As the oxygen pressure decreases, the decomposition of 123 follows the sequence 123→ Y2BaCuo5 (211) + BaCuO2° Cu2O→ 211 ° BaCuO2° BaCu2O2→ 211 ° YBa3Cu2Ox (132) ° BaCu2O2→ 211 ° BaCu2O2°BaO. The incongruent melting temperatures have been determined in the oxygen pressure range 10–6 to 1 atm by differential thermal analysis, and the phases formed on solidification have been identified by XRD. The stability diagram for the composition 123 has been constructed.
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Citations
Materials chemistry and thermodynamics of REBa2Cu3O7−x
TL;DR: In this paper, the authors focus on the materials chemistry and thermodynamics of the rare earth series of superconductors and discuss the importance of this basic information for predicting and controlling structure and microstructure of single crystals, thin films, and bulk materials.
71
Phase equilibria in the YBCuO system and melt processing of Ag clad Y1Ba2Cu3O7−x tapes at reduced oxygen partial pressures
TL;DR: In this article, phase-stability studies of Y1Ba2Cu3O7−x(+Ag) and BaCu2O2 (+Ag) over the temperature range 780°C-950°C and oxygen partial pressure range 1.0 × 10 −6 −2.0× 10 −1 atm.
61
Origin of the y2ba1cu1o5 free region in melt-textured y-ba-cu-o oxides
TL;DR: In this article, microstructures concerning incongraent mehing and peritectic reaction were studied in melt-textured Y-Ba-Cu-O oxides, and it was concluded that formation of spherical pores during incongruent melting of YBa2Cu3O7−y is responsible for the formation of the Y2BaCuO5 free regions.
34
Liquidus Diagram of the Ba-Y-Cu-O System in the Vicinity of the Ba2YCu3O6+x Phase Field.
Winnie Wong-Ng,Lawrence P. Cook +1 more
TL;DR: The melting equilibria in the vicinity of the high Tc phase Ba2YCu3O6+x are described, including evidence for two Ba-Y-Cu-O immiscible liquids, and Implications for the growth of Ba 2YCu 3O 6+x crystals are discussed.
High temperature thermodynamic properties, orthorhombic/tetragonal transition and phase stability of GdBa2Cu3Oy and related R123 compounds
TL;DR: In this paper, thermogravimetric measurements of the equilibrium oxygen partial pressure (p(O 2 )) as a function of temperature and oxygen content have been made on GdBa 2 Cu 3 O y (Gd123) within the range 3×10 −4 atm≤ p (O 2 )≤ 1 atm and 450°C≤ T ≤ 800°C.
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References
Determination of Oxygen Nonstoichiometry in a High-Tc Superconductor Ba2YCu3O7-δ
TL;DR: In this paper, thermogravimetric measurement and chemical analysis of oxygen nonstoichiometry were made at a temperature range of 350 to 1000°C and under the oxygen partial pressure of 10-4 to 1 atm.
350
Phase equilibria and crystal chemistry in the system Ba-Y-Cu-O
R.S. Roth,K.L. Davis,J.R. Dennis +2 more
TL;DR: In this paper, preliminary phase equilibria diagrams are constructed for the binary systems BaO-{1/2}Y{sub 2}O{sub 3}, BaO -CuO-sub 7-x, and the ternary system BaO
328
Correlation between the in situ growth conditions of YBCO thin films and the thermodynamic stability criteria
Robert Hammond,R. Bormann +1 more
TL;DR: In this paper, the authors compared data from the literature on the successful in situ growth of YBCO thin films in terms of the growth temperature and the oxygen pressure with the thermodynamic stability as determined by an electrochemical method.
292
Liquidus relations in Y–Ba–Cu oxides
Terry L. Aselage,K. D. Keefer +1 more
TL;DR: The liquidus relations in the system YO1.5-BaO-CuOx in air in the compositional region near the superconducting oxide YBa2Cu3Ox were studied by differential thermal analysis, x-ray diffraction, electron microprobe analysis, and visual observation as discussed by the authors.
280
Effect of oxygen pressure on the synthesis of YBa2Cu3O7-x thin films by post-deposition annealing
TL;DR: In this paper, the effect of ambient oxygen pressure on the synthesis of epitaxial YBa2Cu3O7−x films on (100) SrTiO3 substrates by post-deposition annealing of amorphous precursor films was studied for oxygen partial pressures pO2 between 1.0 and 8.0×10−5 atm.
280