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[en] Process for decontaminating a radioactive effluent containing ruthenium at least. Under this process, in an effluent containing radioactive elements, a certain number of precipitates are formed which exhibit absorbent and/or co-precipitant properties with respect to the radioactive elements contained in the effluent, the precipitates being formed without intermediate phase separation. It is characterised in that a cobalt sulphide precipitate is formed in the effluent to be processed
[fr]Procede de decontamination d'un effluent radioactif contenant au moins du ruthenium, du type selon lequel on forme dans un effluent contenant des elements radioactifs un certain nombre de precipites presentant des proprietes absorbantes et/ou coprecipitantes vis-a-vis des elements radioactifs contenus dans l'effluent, les precipites etant formes sans separation intermediaire, de phases, caracterise en ce que l'on forme dans l'effluent a traiter un precipite de sulfure de cobalt
[en] The hexagonal mixed system Cosub(x)Fesub(1-x)S has been studied by Moessbauer spetroscopy. As the Co concentration increases, there is a progressive crystallographic *a transition from the NiAs structure to a superstructure and the temperature range of coexistence of the two phases widens. The temperature of maximum coexistence decreases with increasing Co content at a rate an order-of-magnitude higher than for the Neel temperature. (Author)
[en] ZSM-5 was obtained in a completely inorganic system. Besides, several experiments were carried out to introduce Co+2 in the Framework of inorganic ZSM-5. The addition of a cobalt source to the precursor gel increased the time to obtain ZSM-5 crystals compared to the gel without a cobalt source. Furthermore, thermal stability over 500 was lower in Co-ZSM-5. Chemical analysis suggests that some cobalt was in the channels, since it was removed by ion exchange
[en] The magnetic entropy change, ΔSM, was measured for Co(S1-xSex)2 with 0=< x=<0.103, which is a system showing the itinerant electron metamagnetism (IEM). It was found that the peak value of -ΔSM shows a maximum at around x=0.08. The origin of this behavior is discussed in terms of the Clausius-Clapeyron relation
[en] We have explored several structure-inheriting solid-state reactions (SISSRs) under hydrothermal conditions for syntheses in the Co-Mo-O system. And we found an interesting hydrothermal SISSR from CoMoO4.3/4H2O to high-pressure (hp-) phase of CoMoO4, which enabled us to considerably reduce the severe conditions for the synthesis of hp-CoMoO4. As similar hydrothermal SISSRs are expected to be useful tools for material syntheses, we also briefly discuss them as a means of developing novel material syntheses and designs
[en] Highlights: • Cobalt ferrite nanoparticles encased in silica matrix. • Cobalt ferrite nanowires obtained by dissolving the silica matrix. • Magnetic behavior depending on the surrounding medium. • Superparamagnetism above room temperature. Cobalt ferrite particles with homogeneous microstructure have been prepared encased in MCM-41 (Mobil Composition Matter) and SBA-15 (Santa Barbara Amorphous) silica mesoporous structures. In addition, it was possible to obtain ferrite nanowires once the silica matrix was dissolved. The variety of samples prepared has allowed to deeply analyze the matrix effect in the magnetic behavior of these particles that behave as superparamagnetic at room temperature. It was found at 5 K, a drastic magnetic hardening of the encased ferrite particles due to the employment of such matrices, while no matrix effect was observed at 250 K.
[en] Co2Z hexaferrite is a planar anisotropic iron oxide which can present high values of permeability at high frequency. In this paper, Cu-modified Co2Z hexaferrites powders were synthesized at a low temperature using a citrate precursor method. The formation of Z-type phases was characterized by X-ray diffraction and magnetization measurements. It is found that phase formation temperature and sintering temperature were influenced directly by the content of copper. The effects of Cu-substitution on the microstructure and high frequency properties of the ceramics have been investigated
[en] Lanx was the first manufacturer of vacuum-deposited rigid disks. The technology was based on a Co-Cr perpendicular magnetic recording medium that was compatible with commercially available ferrite ring heads. Performance data for the Lanx perpendicular disk, a description of the manufacturing equipment and some comments on the times are given. - Research highlights: → Lanx was the first manufacturer of sputtered rigid disks. → Lanx Co-Cr perpendicular magnetic recording media worked with existing ring heads. → Linear densities achieved by Lanx and today are similar when geometrically scaled.