Oxygen stoichiometry, phase stability, and thermodynamic behavior of the lead-doped and lead-free Bi-2212 systems.
Electromotive-force (EMF) measurements of oxygen fugacities as a function of stoichiometry have been made on lead-doped and lead-free Bi{sub 2-z}Pb{sub z}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub x} superconducting ceramics in the temperature range {approx} 700-815 C by means of an oxygen-titration technique that employs an yttria-stabilized zirconia electrolyte. Equations for the variation of oxygen partial pressure with composition and temperature have been derived from our EMF measurements. Thermodynamic assessments of the partial molar quantities {Delta}{bar H} (O{sub 2}) and {Delta}{bar S}(O{sub 2}) for lead-doped Bi-2212 and lead-free Bi-2212 indicate that the solid-state decomposition of these bismuth cuprates at low oxygen partial pressure can be represented by the diphasic CuO---Cu{sub 2}O system.
- Research Organization:
- Argonne National Laboratory (ANL)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937872
- Report Number(s):
- ANL/CMT/JA-22496
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: 1996 Vol. 270; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
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