Oxygen potentials and phase equilibria in the system Ca-Co-O and thermodynamic properties of Ca3Co2O6 and Ca3Co4O9.163

Oxygen potentials established by the equilibrium between three condensed phases, CaOss+CoOss+ Ca3Co2O6 and CoOss+Ca3Co2O6+Ca3CO3.93+O-alpha(9.36-delta), are measured as a function of temperature using solid-state electrochemical cells incorporating yttria-stabilized zirconia as the electrolyte and pure oxygen as the reference electrode. Cation non-stoichiometry and oxygen non-stoichiometry in Ca3Co3.93+alpha O9.36-delta are determined using different techniques under defined conditions. Decomposition temperatures and thermodynamic properties of Ca3Co2O6 and Ca3Co4O9.163 are calculated from the results. The standard entropy and enthalpy of formation of Ca3Co2O6 at 298.15 K are evaluated. Using thermodynamic data from this study and auxiliary information from the literature, phase diagram for the ternary system Ca-Co-O is computed. Isothermal sections at representative temperatures are displayed to demonstrate the evolution of phase relations with temperature. (C) 2014 Elsevier Inc. All rights reserved.

Sapientia, 1987, Vol. XLII, nº 163 (número completo)

Contenido: Dios en la filosofía / Octavio N. Derisi -- Trascendencia y trascendentalidad / Octavio N. Derisi -- El hombre en el mundo desde una perspectiva aristotélica / Silvana Filippi -- El evolucionismo materialista y la doctrina hilemórfica / Jorge Martínez Barrera -- Notas y comentarios -- Bibliografía

Dados estatísticos : eleições federais, estaduais, realizadas no Brasil em 1962 e em confronto com anteriores. Referendum 6.163

Apresenta dados estatísticos e quadros sinópticos das eleiçõs federais e estaduais no Brasil em 1962.

Final Supplemental Environmental Document Pacific herring commercial fishing regulations (Sections 163, 163.1, and 164, Title 14, California Code of Regulations)

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