A.E. Sagua

Lithium intercalation in FeOCl revisited

The reaction of iron oxychloride with n-butyl-lithium has been re-examined, important changes being found in the structure and properties of the lithiated compounds as compared to the pristine material. Lithium intercalation by these means increases several orders of magnitude the electrical conductivity of FeOCl although the intercalate remains semiconductor. From the structural and microstructural point of view the lithiation results in complex changes, including inter alia staging, superstructures, etc., and it seems to be quite an heterogeneous process.

Thermodynamic characterization of the ternary phase pavonite (AgBi3S5)

Abstract From electron magnetic field measurements carried out with a solid-electrolyte galvanic cell Ag¦RbAg4I5¦(AgBi3S5 + Bi2S3 + S) + graphite as a function of temperature, ΔƒGtom, ΔƒHtom and ΔFstom of the ternary phase pavonite (AgBi3S5) in equilibrium with Bi2S3 and S were obtained.

On the phase equilibrium of (Ag2S+S) and (CuS+S) from e.m.f. measurements in solid-state galvanic cells

Abstract By means of the e.m.f. measurement method with solid-state galvanic cells, ΔfG0m, ΔfH0m and ΔfS0m of Ag2S and CuS phases were determined. Some apparent discrepancy on ΔfG0(CuS) was found which is explained on the basis of the presence of a narrow solubility range of a third component according to previous results obtained with the [(1−x−y)Ag+xCu+yS] system.

Study of the interaction between auxiliary electrolytes based on AgI and electrode material of the system [(1−x−y)Ag+xBi+yS] with the addition of graphite

Abstract The interaction between the electrolytes AgI and RbAg4I5 and electrode material from the system [(1−x−y)Ag+xBi+yS], to which different quantities of graphite were added, was studied. A reaction mechanism. is proposed based on the decomposition of the auxiliary electrolyte to elucidate the effect of adding graphite to electrode materials of low electronic conductivity.

Study of the influence of some electrolytes on the e.m.f. measurements in solid-state electrochemical cells with cathodic materials from the ternary system {(1−x−y)Ag + xCu + yS}

Abstract By means of the e.m.f. measurement method with solid-state galvanic cells, the compatibility of the RbCu 3 Cl 4 and 0.5CuI 0.5(Cu 2 O + P 2 O 5 ) fast electrolytes with electrodic materials from the system {(1− x − y ) Ag + xCu + yS } at temperatures below 373 K was studied. Some unexpected results involving the interphase reactions with cathodic materials in the ternary equilibrium zones (Ag 2 S + Ag 1.55 Cu 0.45 S + CuS) and (Ag 2 S + S + CuS) are explained.