Low-temperature phase equilibria in the Y-Ba-Cu-O system

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08884.x· OSTI ID:103609

Brosha, E L; Garzon, F H; Raistrick, I D ^[1]; Davies, P K ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

Ultrasonically prepared freeze-dried nitrate precursors and high-precision solution calorimetry were used to investigate the low-temperature thermodynamic stabilities of compounds in the Y-Cu-O, Ba-Cu-O, Y-Ba-O, and Y-Ba-Cu-O pseudobinary and pseudoternary systems at 1 atm of oxygen. Y{sub 2}Cu{sub 2}O{sub 5}, Y{sub 2}BaCuO{sub 5}, and BaCuO{sub 2} were found to be metastable below 682, 728, and 710 {+-} 5C, respectively. The only stable phases in the Y-Ba-Cu-O system at 298 K and 1 atm of oxygen are Ba{sub 2}Cu{sub 3}O{sub 6}, CuO, BaO{sub 2}, and Y{sub 2}O{sub 3}. By compiling the calorimetric and phase equilibria data, a series of Y-Ba-Cu-O isothermal phase diagrams were constructed between 25 and 900 C at 1 atm of oxygen.

• Sponsoring Organization: USDOE
• OSTI ID: 103609
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 278; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALORIMETRY
COPPER OXIDES
METASTABLE STATES
NITRATES
OXYGEN
PHASE DIAGRAMS
PHASE STUDIES
SAMPLE PREPARATION
SUPERCONDUCTIVITY
YTTRIUM OXIDES