Cobalt monoxide

IR spectra, 27 283, 284 magnetic measurements, 27 280 oxidized state, 27 289 Raman spectra, 27 284 reduced state, 27 291 reflectance spectroscopy, 27 279 X-ray diffraction, 27 272, 273 support interactions, 27 290 Cobalt monoxide, field effect, 27 44, 45 Cobalt(nickel)-molybdenum-sulfide catalysts, 42 417... 

The Neel point of cobalt monoxide is 291 K. For obvious reasons this oxide cannot be heated in hydrogen without reduction to the metal. A sample of surface 5.8 m2 g 1 was pretreated in situ by heating it in purified helium at 823 K. The catalyst was then cooled to near room temperature before the admission of hydrogen. Figure 20 shows A k for CoO as a function of extrinsic field up to 18 kOe at 301 K. At this temperature ka was about 7.2 /u.mol m-2 s l. Figure 21 shows results for the same sample at 275 K. Figure 22 shows k0 and AkH at 17.3 kOe over the temperature range 275-300 K. 

Cobalt monoxide is a well-defined chemical entity, but the existence ol monoxides of rhodium and iridium has not as yet been satisfactorily demonstrated. All three metals yield sesquioxides, of the type R203, and dioxides, of the type R02. The last named exhibit weak acidic tendencies in that they can unite with bases to form cobaltites, rhodites, and iridites respectively, analogous to the ferrites, ruthenites, and osmites mentioned in the previous section, and exhibiting an interesting relationship to the chromites and manganites. 

Cobaltous Oxide, Cobalt Monoxide, CoO, may be obtained from cobaltic oxide by reduction in a current of ammonia,1 or of hydrogen at about 350° C. At higher temperatures metallic cobalt is obtained. 

Cobalt monosulphide is also obtained as a black hydrated precipitate on addition of ammonium sulphide to a neutral solution of a cobalt salt. Although the precipitate is soluble only with difficulty in hydrochloric acid it is not obtained when hydrogen sulphide is passed into a solution of a cobalt salt acidified with a mineral acid. The explanation is probably similar to that given for the nickel analogue (q.v.). An Oxysulphide, CoO.CoS, is stated to result on heating cobalt monoxide in a current of hydrogen sulphide.12... 

Cobalt Disulphide, CoS2.—Setterberg3 believed that this sulphide results on heating cobalt monoxide to redness, either in contact with sulphur or in a current of hydrogen sulphide. The mass is treated with dilute hydrochloric acid, leaving an unstable residue of disulphide. Moist air oxidises it to the sulphate, whilst the application of heat expels some of the sulphur. 

By the last of these methods the salt is obtained in stable, purple-red, truncated octahedra, of density 3-65.10 With ammonia it yields the hexammoniate, CoS04.6NH3.11 Heated in a tube open at both ends, anhydrous cobalt sulphate begins to decompose at 718° C., yielding cobalt monoxide.12... 

The nature of the defects is often difficult to ascertain. Nickel and cobalt monoxides are considered to accommodate composition changes by way of a population of vacancies on the normally occupied metal positions, while in the isostructural CdO the metal excess is usually considered to arise from interstitial Cd atoms. 

COBALT BLACK COBALT MONOOXIDE COBALT MONOXIDE COBALTOUS OXIDE COBALT OXIDE COBALT(2+) OXIDE MONOCOB.ALT OXIDE ZAFFRE... 

Cobalt oxide 4250 CoO Asbolite black oxide of cobalt cobalt black cobalt monoxide cobaltouc oxide gray oxide of cobalt oxide of cobalt protoxide of cobalt. 

Fig. 2 Emission-FTIR monitoring of the decomposition of spinel cobalt oxide to cobalt monoxide in air at elevated temperatures.

A similar treatment can be applied to the oxidation of cobalt to CoO. Cobalt monoxide is a metal deficit p-type semiconductor forming cation vacancies and electron holes according to Equation (3.59), where K <) = Cw Ch pX. ... 

Cobalt monooxide Cobalt monoxide. See Cobalt oxide (ous)... 

CAS 1307-96-6 EINECS/ELINCS 215-154-6 Synonyms Cl 77322 Cl pigment black 13 Cobalt black Cobalt monooxide Cobalt monoxide Cobaltous oxide Cobalt oxide Cobalt... 

Reduction of expensive inactive cell components is focused on the positive electrode, including the nickel foam substrate and cobalt metal and cobalt monoxide used to form the conductive network. Several approaches are being studied replacement of the cobalt compounds by metallic nickel fibers use of reduced quantity and less expensive cobalt compounds. An innovative approach being studied is the use of inherently more conductive nickel hydroxide accomplished by multielement modification, and by heterogeneous nickel hydroxide powder particles where filamentary metallic fibers have been embedded into the base nickel hydroxide to make contact with the overall conductive network. To reduce the cost of the foam substrate, development activities include less expensive nickel coating processes and elimination of the foam entirely by enhancing the conductivity of the nickel hydroxide and the conductive network. 

B. Fisher and D. S. Tannhauser, Electrical properties of cobalt monoxide, J. Chem. Phys. 44, 1663-1672(1966). 

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