Phosphides physical properties

Clark, P.W. and Mulraney, B.J., Synthesis and physical properties of chlo-rodi(o-tolyl)phosphine, lithium di(o-tolyl)phosphide and the diphosphine series (o-tolyl)2P(CH2)nP(o-tolyl) (n = 1-4,6,8), /. Organomet. Chem., 217,51,1981. 

Ca, Sr, and Ba Amide and Phosphide Compounds and Their Physical Properties... 

The diversity in structure and bonding possible for phosphides is effectively demonstrated by the monophosphides. Monophosphides MP of the group 1 and 2 elements (El, E2) are polyphosphides with i(P ) chains and P2" dumbbells, respectively. Ell and E12 monophosphides are not known. The E3 and E13 monophosphides are the so-called normal compounds with 3x = (M) (see Section 2). With El3, they form the zinc blende structure with tetrahedral heteroatomic bonds. Ternary derivatives such as MgGeP2 and CuSi2P3 have a random distribution of the M atoms, whereas CdGeP2, crystallizes in the ordered chalcopyrite type with a TO[GeP4/2] tetrahedral net (see Section 6.4). The E3 monophosphides form the NaCl structure. CeP is remarkable because of its physical properties (metal-semiconductor transition heavy-fermion behavior). The E14 monophosphides show the break usually observed when passing the Zintl border. Binary lead phosphides are not known SiP and GeP... 

As an illustration of the effect sample history can have upon chemical and physical properties, the rate of thermal decomposition of Ph(H)PP(H)Ph, which forms PhPHj, catena-H2(PhP) and cyclo-(PhP)5, is strongly influenced by light, phosphides and traces of strong acids or bases. ... 

Details for synthesizing PH3 from duminium phosphide have been given, and the chemistry and physical properties of phosphine have been reviewed. Short sections on the higher phosphines are also included. 

Small quantities of pnictide elements, when introduced into pure metals, may profoundly affect their properties. In some cases, the formation of definite metal pnictide componnds snch as phosphides (Chapter 8) is involved. Some physical properties of the pnictide elements are compared in Table 4.9. 

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 chemical purity of phosphides is important since impurities can have drastic effects on their properties, particularly electrical. Many phosphides are high melting point materials which are produced by sintering processes. Specimens can consequently exhibit large variations of porosity— a factor which also affects other physical properties. Densities in particular are liable to be somewhat less than the theoretically possible. 

Important physical properties found amongst metal phosphides include saniconduction, superconduction and ferromagnetism. 

Some metal phosphides, when fabricated on the nanoscale, can exhibit electrical and other physical properties remarkably different from those of the bulk material. Such materials, which include quantum dots , are currently of much interest because of their potential use in microelectronics. 

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