Arsenic nitride

Arsenic Nitride, AsN, has been described as an orange-red powder obtained by heating at 250° C., preferably in a vacuum, the imide described below.1 Attempts to prepare it by heating arsenious oxide in ammonia or with a cyanide were not successful.2... 

I. A. Bachman 20 found that no signs of arsenic nitride, AsN, were obtained by heating arsenic trioxide to 300°-350° in an atm. of ammonia but if a sealed... 

Orthorhombic black phosphorus will take up arsenic in solid solution and it forms a definite compound AsP. The latter can also be made by reaction (4.37). An analogous reaction (4.38) may occur with antimony hydride. Arsenic phosphide, (AsP) , resembles orthorhombic black phosphorus in physical properties and has a similar puckered layer structure. Arsenic nitride (AsN) also appears to have a structure of this kind and a similar layer structure might be expected for (PN) (see Chapter 7). 

The preparation of similar precursors suitable for the deposition of metal nitrides is analogous to the preparations of phosphorus and arsenic compounds. The initial reaction of metal trialkyls MR3 (M = A1, Ga, In) with amines (NHR 2) results in the formation of oligomeric amido compounds [R2MNR 2] (n = 2 or 3) which eliminate alkanes on thermolysis. The incorporation of a proton as a substituent on the pnictide bridging ligand has been examined, and many compounds of the type [R2MNHR ]2 have been synthesized. The presence of this proton may facilitate /3-elimination, allowing lower deposition temperatures to be used. 

Reduction to arsenic also results on heating with boron nitride.2... 

Arsenic Imide, As2(NH)3, is obtained by heating to 60° C. the amide described below. It is a pale yellow amorphous powder, stable in air up to 100° C., but above that temperature it decomposes forming the nitride. It is slowly decomposed by water into arsenious oxide and ammonia.3... 

Arsenic Amide, As(NH2)3, is formed by the action of ammonia on arsenic trichloride, tribromide or triiodide at -35° to —40° C., the ammonium halide being removed from the residue by washing with liquid ammonia, in which the amide is insoluble.3 It is a greyish-white powder, stable in dry air below 0° C., but above this temperature it begins to decompose, yielding the imide and, at higher temperatures, the nitride. It may be kept at ordinary temperatures in an atmosphere of ammonia without decomposition. Water readily converts it into arsenious oxide and ammonia. 

Light-emitting diodes -arsenic m [ARSENIC AND ARSENIC ALLOYS] (Vol 3) -gallium and indium nitrides in [NITRIDES] (Vol 17) -germaniumm [GERMANIUM AND GERMANIUMCOMPOUNDS] (Vol 12) -phosphorus compounds m [PHOSPHORUS COMPOUNDS] (Vol 18) -use m biosensors [BIOSENSORS] (Vol 4)... 

Figure 8.5 Structure of Ca3AsN. An example of a calcium containing ternary nitride in the anti-perovskite structure. White spheres = Arsenic, White prisms = Ca6N octahedra.

For example, during oxidation, enhanced diffusion of phosphorus, boron, and arsenic are observed, as well as retarded diffusion of antimony. However, if direct nitridization of the silicon surface occurs, then the inverse effects are observed, that is, enhanced antimony diffusion and retarded phosphorus diffusion. Also, oxidation-enhanced diffusion is significantly affected by doping. As either p- or n-type doping concentration increases above nh oxidation-enhanced diffusion diminishes. If chlorine is introduced into the oxidizing ambient, oxidation-enhanced diffusion is likewise diminished. 

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