Oxygen stoichiometry, phase stability, and thermodynamic behavior of the lead-doped and lead-free Bi-2212 systems
| Autor: | Victor A. Maroni, B.S. Tani, M.C. Hash, M. Tetenbaum |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
Energy Engineering and Power Technology chemistry.chemical_element Thermodynamics Partial molar property Partial pressure Electrolyte Atmospheric temperature range Condensed Matter Physics EMF measurement Oxygen Electronic Optical and Magnetic Materials Bismuth chemistry Electrical and Electronic Engineering Stoichiometry |
| Zdroj: | Physica C: Superconductivity. 270:114-128 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(96)00454-6 |
| Popis: | Electromotive-force (EMF) measurements of oxygen fugacities as a function of stoichiometry have been made on lead-doped and lead-free Bi2−zPbzSr2Ca1Cu2Ox superconducting ceramics in the temperature range ≈ 700–815°C by means of an oxygen-titration techique 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 Δ H (O2) and Δ S (O2) 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 CuOCu2O system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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