Pb solubility of the high-temperature superconducting phase Bi2Sr2Ca2Cu3O(10+d)
Conference
·
OSTI ID:135382
For the nominal composition of Bi(2.27-x)Pb(x)Sr2Ca2Cu3O(10+d) lead content was varied from x = 0.05 to 0.45. The compositions were examined between 830 and 890 C which is supposed to be the temperature range over which the so-called 2223 phase (Bi2Sr2Ca2Cu3O(10+d)) is stable. Only compositions between x = 0.18 to 0.36 could be synthesized in a single phase state. For x is greater than 0.36 a lead containing phase with a stoichiometry of Pb4(Sr,Ca)5CuO(d) is formed, for x is less than 0.18 mainly Bi2Sr2CaCu2O(10+d) and cuprates are the equilibrium phases. The temperature range for the 2223 phase was found to be 830 to 890 C but the 2223 phase has extremely varying cation ratios over this temperature range. Former single phase 2223 samples turn to multi phase samples when annealed at slightly higher or lower temperatures. A decrease in the Pb solubility with increasing temperature was found for the 2223 phase.
- Research Organization:
- National Aeronautics and Space Administration, Houston, TX (United States). Lyndon B. Johnson Space Center
- OSTI ID:
- 135382
- Report Number(s):
- N--96-10272; NASA-CP--3290-VOL-2; S--792-VOL-2; NAS--1.55:3290-VOL-2; CONF-940627--
- Country of Publication:
- United States
- Language:
- English
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