It has been shown that anodic oxidation of copper in alkaline solutions leads to a true passivation due to the formation of a protective layer. The properties of this layer depend on various factors such as current density, structure of the metal, electrolyte concentration and temperature.In all cases investigated in this paper, the primary product of anodic oxidation was cuprous oxide. But this cuprous compound is rapidly oxidised to cupric oxide or hydroxide which are the main constituents of the final film. The formation of cupric oxide is favored by decreasing the current density and raising the temperature. (*) These de doctorat : Bruxelles 1956. (**) Titulaire d'une bourse de spkcialisation de 1'l.R.S.I.A. (1) L. de BROUCKPRE, F. BOUILLON et Y .
Magnetic properties of NpBr4 were studied from 4.2 to 20.0 °K with the Mössbauer resonance of the 59.54-keV γ ray in 237Np. Magnetic susceptibility was measured from 2.2 to 70.5 °K using a vibrating sample magnetometer at an applied field of 10 KOe. An antiferromagnetic transition was found at 12.5±0.5 °K. Above the Néel temperature, NpBr4 obeys the Curie–Weiss law, χ=C/(T+ϑ), with ϑ equal to 16.2 °K and an effective moment of 2.60 μB. The Mössbauer spectra exhibited magnetic hyperfine splitting over the temperature range 4.2 to 20 °K with g0μnHeff=10.4 cm/sec at 4.2 °K. A small decline in g0μnHeff was observed for temperatures above 12 °K.
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