Arsenic phosphides

Most of these compounds were originally prepared by liquid-phase epitaxy. That process is now largely replaced by MOCVD, particularly in the case of gallium arsenide, gallium arsenic phosphide, and gallium aluminum phosphide. 

LED materials include gallium arsenic phosphide, gallium aluminum arsenide, gallium phosphide, gallium indium phosphide, and gallium aluminum phosphide. The preferred deposition process is MOCVD, which permits very exacting control of the epitaxial growth and purity. Typical applications of LED s are watches, clocks, scales, calculators, computers, optical transmission devices, and many others. 

Photodetectors operate by carrier transport across a semiconductor junction. A wide variety of these photodiodes are available, such as Schottky diodes, phototransistors, and avalanche photodetectors. Typical photodetector materials are gallium arsenic phosphide and gallium phosphide, which are produced by MOCVD or MBE. 

Phosphorus, when heated to redness with arsenic, combines to form arsenic phosphide (see p. 286). When phosphorus pentoxide and arsenic are heated together at 290° C. the latter is oxidised to arsenious oxide and phosphorus is liberated.17 Phosphorus trichloride converts arsenic quantitatively into arsenic trichloride when the mixture is... 

Ammonia is slowly absorbed by the triiodide and a voluminous yellow substance is produced8 which, if kept over sulphuric acid, loses ammonia until the composition corresponds with the tetrammino-triiodide, AsIg.ANHg. At 0° C. more ammonia can be absorbed to yield the dodecammino-compound, AsI3.12NH3. If ammonia is passed into a solution of the triiodide in benzene or ether, a voluminous white precipitate, of composition 2AsI3.9NH3, is formed.8 The existence of these ammines as definite compounds has not been established.10 With phosphine, arsenic phosphide is produced ... 

Phosphorus converts arsenious oxide to phosphide 2 (see p. 286). When an aqueous solution is heated with phosphorus to 200° C., a precipitate of arsenic and arsenic phosphide is formed.3 A mixture of the dry oxide with phosphorus trichloride heated to 120° C. in a sealed tube reacts as follows 4... 

Arsenic Phosphides.—Black or brown products of indefinite character, to which have been ascribed the formulae AsaP 4 and AsP,5 have been obtained by various methods, such as (1) by heating the elements together,6 (2) by allowing phosphorus to stand in solutions of arsenious acid,7 and (3) by the action of phosphine on arsenic halides.8 The properties of these substances resemble in general those which would be possessed by mixtures of the two elements thus, they burn in air to give the mixed oxides, decompose on heating with vaporisation of first phosphorus and then arsenic, and are oxidised by nitric acid. 

Arsenic Phosphides, brown substances of indefinite character, were obtained early in the nineteenth century by various methods... 

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). 

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