Barium nitride

Magnesium reacts slowly at lower temperatures to give the amide, as do all active metals this reaction is catalyzed by transition metal ions. Aluminum nitride [24304-00-5] AIN, barium nitride [12047-79-9] Ba2N2, calcium nitride [12013-82-0] Ca2N2, strontium nitride [12033-82-8], Sr2N2, and titanium nitride [25583-20-4], TiN, may be formed by heating the corresponding amides. 

The material is impact-sensitive when dry and is supplied and stored damp with ethanol. It is used as a saturated solution and it is important to prevent total evaporation, or the slow growth of large crystals which may become dried and shock-sensitive. Lead drains must not be used, to avoid formation of the detonator, lead azide. Exposure to acid conditions may generate explosive hydrazoic acid [1], It has been stated that barium azide is relatively insensitive to impact but highly sensitive to friction [2], Strontium, and particularly calcium azides show much more marked explosive properties than barium azide. The explosive properties appear to be closely associated with the method of formation of the azide [3], Factors which affect the sensitivity of the azide include surface area, solvent used and ageing. Presence of barium metal, sodium or iron ions as impurities increases the sensitivity [4], Though not an endothermic compound (AH°f —22.17 kJ/mol, 0.1 kj/g), it may thermally decompose to barium nitride, rather than to the elements, when a considerable exotherm is produced (98.74 kJ/mol, 0.45 kJ/g of azide) [5]. 

Barium nitride, 0219 Barium nitridoosmate, 0213 Barium perchlorylamide, 0203 Barium /V-perchlorylbenzylamidc, 3649... 

Ammonium nitridoosmate, 4523 Antimony(III) nitride, 4729 Barium nitride, 0219... 

Barium ions carry a 2+ charge, and nitrogen ions carry a 3— charge. What would be the chemical formula for the ionic compound barium nitride ... 

Barium Nitride, Hexa. Same as Barium Diazide... 

Amminebarium bis(nitrophenylide), 3512 Amminepentahydroxyplatinum, 4566 Ammonium nitridoosmate, 4518 Antimony (III) nitride, 4724 Barium nitride, 0219 Barium nitridoosmate, 0213 Barium V-perchlorylbenzylamide, 3642 Barium perchlorylamide, 0203... 

These are usually reactions of anhydrous transition and B metal halides with dry alkali metal salts such as the sulphides, nitrides, phosphides, arsenides etc. to give exchange of anions. They tend to be very exothermic with higher valence halides and are frequently initiated by mild warming or grinding. Metathesis is described as a controlled explosion. Mixtures considered in the specific reference above include lithium nitride with tantalum pentachloride, titanium tetrachloride and vanadium tetrachloride, also barium nitride with manganese II iodide, the last reaction photographically illustrated. 

Barium nitride vaporizes slightly at high temperature as it undergoes the dissociation... 

CaClj calcium chloride Ba3N2 barium nitride... 

In many of the studies it is assumed that the particles are nuclei of Ba metal, although barium nitrides are also found. Studies have been made of the rate of particle formation and the rate of particle growth during thermal decomposition [184,186]. The particles are initially round, but after a certain size is reached, they become diamond shaped [184,186]. The formation is structure sensitive. Torkar et al, reported that particle formation starts at the surface but that the particles or nuclei which are found are oblique pyramids, oriented relative to the crystal axes [187]. By X-ray diffraction and other techniques approximately 75% of thermally decomposed Ba(Na)2 has been identified as BaaN2 with the remaining 25% being Ba, presumably in metallic form. 

As noted, evidence has been reported for the formation of barium nitride as a result of thermal decomposition. X-rays have been reported to permanently color Ba(N3)2, and the results were interpreted in terms of nitride formation... 

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