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Equilibrium phase relations in the Bi–Ca–Sr–Cu–O system at 850 and 900°Ca)

Published online by Cambridge University Press:  31 January 2011

C-L. Lee ,
J-J. Chen ,
W-J. Wen ,
T-P. Perng ,
J-M. Wu ,
T-B. Wu ,
T-S. Chin ,
R-S. Liu  and
P-T. Wu
C-L. Lee
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
J-J. Chen
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
W-J. Wen
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
T-P. Perng
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
J-M. Wu
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
T-B. Wu
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
T-S. Chin
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
R-S. Liu
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan, Republic of China
P-T. Wu
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan, Republic of China
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Abstract

The phase relations of equilibrium compounds in the pseudoternary system Bi2O3–(Ca,Sr)O–CuO at 850 and 900°C were studied. The ratio of Ca : Sr was fixed at 1:2. Starting materials of Bi2O3, CaCO3, SrCO3, and CuO with various ratios were mixed, pressed into pellets, and heated at or above and then brought back to 850 or 900°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°C, only the superconducting phase, Bi2CaSr2Cu2Ox (2122), was observed inside the triangle. The other stable phases were all positioned on the boundary lines, and included CuO·⅗MO, CuO·MO, CuO·2MO, 1.½Bi2O3·0.9MO, Bi2O3·4MO, Bi2O3·9MO, and a solid solution, Bi2O3·xMO, where 0.16  x  0.82 and MO represents ⅓(CaO·2SrO). At 900°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.

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1403 - 1408
Copyright
Copyright © Materials Research Society 1990

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