Thermodynamic and nonstoichiometric behavior of the lead-doped and lead-free Bi-2212 systems

Conference · Fri Jan 31 23:00:00 EST 1997

OSTI ID:437758

Tetenbaum, M; Hash, M; Tani, B S; Luo, J S; Maroni, V A

EMF measurements of oxygen fugacities as a function of stoichiometry were made on pb-doped and Pb-free superconducting ceramics at 700-815 C using oxygen titration. Equations of oxygen partial pressure vs composition and temperature were derived from the EMF measurements. Thermodynamic assessments of the partial molar quantities {Delta}{bar H}(O{sub 2}) and {Delta}{bar S}(O{sub 2}) for Pb-doped Bi- 2212 and Pb-free Bi-2212 indicate that the solid-state decomposition of these Bi cuprates at low oxygen partial pressure can be represented by the diphasic CuO-Cu{sub 2}O system. Comparison of these results with Pb-doped Bi-2223 in powder and silver sheath form is presented.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 437758
• Report Number(s): ANL/CMT/CP--90988; CONF-970235--1; ON: DE97003220
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
COPPER OXIDES
CUPRATES
DOPED MATERIALS
HIGH-TC SUPERCONDUCTORS