Equilibrium phase relations in the Bi-Ca-Sr-Cu-O system at 850 and 900 degree C

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1990.1403· OSTI ID:6826900

Lee, C; Chen, J; Wen, W; Perng, T; Wu, J; Wu, T; Chin, T ^[1]; Liu, R; Wu, P ^[2]

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1. Department of Materials Science Engineering, National Tsing Hua University, Hsinchu, Taiwan (Republic of China)
2. Industrial Technology Research Institute, Hsinchu, Taiwan (Republic of China)

The phase relations of equilibrium compounds in the pseudoternary system Bi{sub 2}O{sub 3}-(Ca,Sr)O-CuO at 850 and 900 {degree}C were studied. The ratio of Ca:Sr was fixed at 1:2. Starting materials of Bi{sub 2}O{sub 3}, CaCO{sub 3}, SrCo{sub 3} and CuO with various ratios were mixed, pressed into pellets, and heated at or above and then brought back to 850 or 900 {degree}C for different durations to ensure that equilibrium had been reached. The products were cooled in air or quenched in liquid nitrogen and then identified by x-ray powder diffraction. At 850 {degree}C, only the superconducting phase, Bi{sub 2}CaSr{sub 2}Cu{sub 2}O{sub {ital x}}(2122), was observed inside the triangle. The other stable phases were all positioned on the boundary lines, and included CuO{center dot}3/5MO, CuO{center dot}MO, CuO{center dot}2MO, 1.1/2Bi{sub 2}O{sub 3}{center dot}0.9MO, Bi{sub 2}O{sub 3}{center dot}4MO, Bi{sub 2}O{sub 3}{center dot}9MO, and a solid solution, Bi{sub 2}O{sub 3}{center dot}xMO, where 0.16 {le} x {le} 0.82 and MO represents 1/3(CaO{center dot}2SrO). At 900 {degree}C, the above boundary line phases remained stable but the 2122 phase was not observed. The tie lines among the stable phases in the two isotherms were established.

• OSTI ID: 6826900
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 5:7; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
DISPERSIONS
ELEMENTS
FLUIDS
HIGH-TC SUPERCONDUCTORS
LIQUIDS
MIXTURES
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POWDERS
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION