Phase equilibria and crystal chemistry in portions of the system SrO-CaO-Bi2O3-CuO, part 2 - the system SrO-Bi2O3-CuO
New data are presented on the phase equilibria and crystal chemistry of the binary systems SrO-Bi2O3 and SrO-CuO and the ternary system SrO-Bi2O3-CuO. Symmetry data and unit cell dimensions based on single crystal and powder x-ray diffraction measurement are reported for all the binary SrO-Bi2O3 phases, including a new phase identified as Sr6Bi2O9. The ternary system contains at least four ternary phases which can be formed in air at about 900 C. These are identified as Sr2Bi2CuO6, Sr8Bi4Cu5O(19 + x) Sr3Bi2Cu2O8 and a solid solution (the Raveau phase) which, For equilibrium conditions at about 900 C, corresponds approximately to the formula Sr(1.8-x)Bi(22+x)Cu(1 + or - x/2)Oz(0.0 = or < about 0.15). Superconductivity in the phase apparently occurs only in compositions that correspond to negative values of x. Compositions that lie outside the equilibrium Raveau-phase field often form nearly homogenous Raveau-phase products. Typically this occurs after relatively brief heat treatments, or in crystallization of a quenched melt.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (USA)
- OSTI ID:
- 6387562
- Report Number(s):
- PB-90-256835/XAB
- Resource Relation:
- Other Information: Included in Jnl. of Research of the National Institute of Standards and Technology, Vol. 95, No. 3, 291-334(May-June 1990)
- Country of Publication:
- United States
- Language:
- English
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