Zur Kenntnis des Systems Kupfer–Nickel–Sauerstoff

Abstract

Das System CuNiO wurde im Temperaturbereich von 950 bis 1030°C nach der Methode des isothermen Abbaues untersucht. In diesem Temperaturbereich wird bei den Gleichgewichtsmessungen gefunden, daß im stabilen System keine Verbindung, jedoch eine beträchtliche, temperaturabhängige Löslichkeit von CuO in NiO vorliegt. Löslichkeit von NiO in Cu2O wird nicht festgestellt. Die Löslichkeit von NiO in CuO sollte nach den Gleichgewichtsmessungen gering sein. Der Aktivitätsverlauf des CuO in der CuONiO‐Mischreihe wird für mehrere Temperaturen angegeben. Die Ausdehnung der Phasenfelder im Teilgebiet Cu2OCuNiONi des Phasendreiecks CuNiO wird für 1000°C rechnerisch abgeschätzt.

Growth, Structure and Optical Properties of CuNi-Oxide Films for Nanophotonics and Photovoltaics

“…For the immiscibility of CuO and NiO, see also Ref. [14]. For annealing temperatures similar to ours, some times the separation of NiO and CuO results in the formation of a double layer [15].…”

X‐Ray Photoelectron Spectroscopic Study of the Aqueous Oxidation of Monel‐400

“…9(a), indicated that NiO and Cu20 were present on the outer No attempt was made to determine whether the cuprous oxide .and nickel oxide formed by gaseous corrosion of Monel-400 are in solid solution or are present as separate oxides, i.e., NiO and Cu20. According to Schnal and Muller (31) these oxides are mutually insoluble, and hence one would expect a mixture to form. However, XPS spectra show only one prominent O(ls) line.…”

Determination of the activities in the mixture {xCuO + (1−x)NiO} by solid-electrolyte galvanic cells in the temperature range 1170 K to 1370 K

“…To check whether the solutions CuO in NiO are regular, plots of RT ·ln {f(CuO)} against (1−x) 2 and RT ·ln{ f(NiO)} against x 2 were drawn. They are presented in figures 2 and 3 for T=1270 K. The plots are straight lines passing through the origin and having the same slope: (13526285) J·mol −1 .…”

“…From X-ray investigations (1) the maximum mole fraction solubility of CuO in NiO is 0.34 and that of NiO in CuO is 0.04 at the temperature T=1270 K. There is little literature available on the thermodynamic properties of the solutions. From thermogravimetric measurements Schmahl et al (2) inferred that the solutions exhibited strongly positive deviations from ideality. This fact could be expected in view of the cationic-size disparity leading to positive strain energy in the crystal structure of the solution.…”