Vanadium nitride

Vanadin-saure, /. vanadic acid, -saurean-hydrid, n. vanadic anhydride, vanadium pentoxide, vanadium(V) oxide, V2O6. -stahl, m. vanadium steel, -stickstoff, m. vanadium nitride, -sulfat, n. vanadium sulfate, -ver-bindung, /. vanadium compoimd. 

A new method of preparation from vanadium nitride and chlorine [1] is free of the explosion hazards of chlorine azide and vanadium azide tetrachloride present in an earlier method [2],... 

Titanium and vanadium nitrides may be prepared by a metathesis reaction of their tetrachlorides with the nitride, initiated by heat or friction. The reaction is potentially explosive. Other transition metal halides may cause ampules to explode after thermal initiation when anhydrous and were invariably found to do so when the hydrates were used. 

Numerous studies involving similar amido derivatives of metals such as Ti (e.g. heterometallic cross-coupling of benzonitrile with carbon dioxide, pyridine, and benzophenone with mixed [Ti N(Bu )Ar 3] and [Mo N(Bu )Ar 3] systems), V (e.g. denitrogenation of a vanadium nitride by carbon disulfide and dioxide), Nb (e.g. the... 

Hexammino-vanadium Trichloride, [V(NH3)6]C13.—The similarity between the trichlorides of iron and vanadium is further shown in their behaviour towards ammonia. At ordinary temperatures ammonia reacts with vanadium trichloride to produce vanadium nitride, VN, and ammonium chloride, but if liquid ammonia is poured over vanadium trichloride, a quantitative yield of a reddish-brown salt, [V(NH3)6]C13, is obtained, which recalls the hexammines of cobalt and chromium. The ammonia molecules are not, however, very firmly held, and the compound is, therefore, more comparable with the corresponding hexammine of ferric chloride, [Fe(NH3)6]Cl3. 

It has been reported that vanadium nitride films can be obtained by OMCVD at 473 K and normal pressure from the decomposition of V(NMe2)4, and that pure product can only be obtained if the gas phase is enriched with ammonia.19 Otherwise, the deposits contain large amounts of carbon. 

W. Muthmann and co-workers also reported that finely divided vanadium reacts with nitrogen at a red-heat. The reaction is so slow that 20-24 hrs. are needed for the increase in weight to become constant nitrogen is also absorbed at dull redness, but the action is still slower. In contradistinction to H. E. Roscoe, the composition of the product approximated vanadium heminitride, V2N. R. E. Slade and G. I. Higson found that vanadium nitride dissociates at 1203° and 02 mm. press. According to N. Whitehouse, at a white-heat vanadium forms the mononitride. The velvety-black powder is unchanged in air when heated in air, however, it forms vanadium pentoxide water, and dil. hydrochloric acid, hot or cold, have no action, but it dissolves in cold dil. nitric acid. G. Gore found that vanadium nitride is insoluble in liquid ammonia. It is not affected by alkali-lye, but with fused potassium hydroxide, ammonia is evolved. 

Hartl (26) treated vanadium, chromium, and titanium nitrides in argon-5% acetylene RF plasmas. The nitrides were dropped as powders into a vertical plasma torch in which the gas stream was flowing upwards. Product was collected both as wall deposits and as loose powder at the lower end of the torch (i.e., the plasma gas inlet). In the case of vanadium, the products collected were identified by X-ray analysis to be a mixture of vanadium nitride and carbide (VC-VN) with... 

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