The system CuI-Ag3AsO4, which shows a structure associated with fast ionic transport, has been examined with the hope to investigate the reciprocal role of silver and copper in disordered materials. Ionic and electronic conductivity and transport number were determined. X-ray, differential scanning calorimetry and electrochemical analyses were carried out using standard procedures and equipment. Results reported show that CuI-Ag3AsO4 acts as a silver ionic conductor, even starting with a mixture with a high CuI (50 m/o) content. The observed behaviour is discussed in connection with the structural and chemical features of the material.

The rhombohedral R-phase appearance in NiTi alloys can be induced by thermal cycling between martensite (M) and parent phase (P). This procedure has here been followed to separate P-R and R-M transformations.

Yellow β-PbO (massicot) and β-PbO2 (plattnerite) have been investigated as cathode materials in organic electrolyte lithium cells. The main cha

The electrochemical behaviour in lithium-organic electrolyte cells of amorphous tungsten and molybdenum trioxides, previously characterized by TGA and DSC, has been studied. The discharge curves were strictly similar for both materials (after addition of graphite) while showing a marked difference in discharge characteristics compared to the corresponding crystalline compounds. The observed behaviour is discussed in connection with the structural and morphological features of the host materials.

AbstractIn Li‐Zellen vom Typ Li/LiClO4‐PC/Cu2S wurden α‐Cu2S (Chalkocit), Cu,‐76S (Digenit) und CuS (Covellit) als Kathoden getestet (Röntgenspektrcn, Entladungskurven).

The electrochemical behaviour of various tungsten oxides in lithium-organic electrolyte cells has been studied by voltage-composition curves, micropolarization and cycling tests. The change in structure of the oxides which follows the lithium incorporation has been investigated by X-rays showing marked differences between WO3, the typical crystallographic shear oxide W20O58, and the tunnel structure oxide W18O49.

A preliminary investigation of anatase, TiO2, as a positive electrode material in secondary lithium—organic electrolyte batteries is reported.

AbstractDie Festkörperreak‐ tion zwischen CuO und WO3 zu CuWO4‐.x wird mit Hilfe der Kontaktmethode in Luft und N2 untersucht.

Abstract The solid state reaction of CuWO4-x formation from CuO and WO3 was studied by the contact method in air and nitrogen. The results showed that the reaction is governed by the diffusion of the W6+ and O2- ions and that the rate determining step is the diffusion of oxygen ions in the reaction product. This is in agreement with the defect structure of copper tungstate, an n-type semiconductor with oxygen vacancies through which the diffusion process is possible.

Ag 2 WO 4 wird durch Fällung aus 0.5 M Naz‐ WO4‐Lösung mittels einer AgNO 3 ‐Lösung ähnlicher Konzentration dargestellt.

The epitaxial growth of antimony electrodeposits obtained at 25 and 50° C from chloride and citrate baths on copper single-crystal cathodes orientated along (1 0 0), (1 1 0) and (1 1 1) crystallographic planes has been studied by electron diffraction. Current densities ranging from 10 to 1000 A m−2 and thicknesses between 0.2 and 10μm have been investigated. Amorphous electrodeposits were usually obtained from the chloride bath at a temperature of 25° C. The monocrystalline deposits obtained from both baths on (1 0 0) and (1 1 1) copper planes were oriented with their (1 1 0) and (\(\bar 110\)) planes and with their (1 0 0) plane, respectively, parallel to the substrate. On the (1 1 0) copper substrate, monocrystalline deposits were only obtained from the citrate bath, their (\(\bar 221\)) plane being parallel to the substrate face. For the sake of completeness, some bismuth electrodeposits on the same copper substrate faces were also studied. The results are discussed in terms of work of nucleation, symmetry of the deposit-substrate interface region and mismatch along close packed directions. They are also discussed in connection with the results related to bismuth electrodeposits.

The preparation of two forms of silver monotungstate, two forms of silver ditungstate and of silver tetratungstate is described, together with their characterisation by X-ray powder diffraction and IR spectra. Comparisons are made with structural data.

The characteristics and performances of the Li/CuMoO4 and Li/CuWO4 couples in LiAsF6-γ-butyrolactone are reported in terms of discharge mechanism, polarization and cathode efficiency. On the basis of the energetic properties, these copper oxysalts may be regarded as very promising cathodes for the development of high energy lithium power sources.