System Sr−Pb−O: Phase Equilibria and Thermodynamics Using Solid-State Cells with Buffer Electrodes

Autor:	K. T. Jacob, K. P. Jayadevan
Rok vydání:	2000
Předmět:	Ternary numeral system Chemistry General Chemical Engineering Thermodynamics General Chemistry Electrolyte Reference electrode Gibbs free energy chemistry.chemical_compound symbols.namesake Ternary compound Phase (matter) Materials Chemistry symbols Polarization (electrochemistry) Ternary operation
Zdroj:	Chemistry of Materials. 12:1779-1786
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm990728i
Popis:	The isothermal section of the phase diagram for the system Sr−Pb−O at 1100 K is established by equilibrating 18 compositions in the ternary and analyzing quenched samples using optical and scanning electron microscopy, EDX and XRD. Two ternary oxides, Sr2PbO4 and SrPbO3, containing lead in the tetravalent state, are found to be stable. They coexist with PbO. Alloys and intermetallics are in equilibrium with SrO. The high-temperature thermodynamic properties of the ternary oxides are measured for the first time with a novel apparatus. Yttria-stabilized zirconia is used as the solid electrolyte and pure diatomic oxygen gas as the reference electrode. The new feature is the buffer electrode, which is introduced between the reference and measuring electrodes to absorb the electrochemical flux of oxygen through the solid electrolyte. This prevents the polarization of the measuring electrode and ensures accurate data. Measurements are made in the temperature range 860−1090 K. The standard Gibbs energies of form...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d68641c10da66ae972d9ae97a4fa2199 https://doi.org/10.1021/cm990728i Zobrazit plný text záznamu