Phosphide silicide

Phosphide silicides or silicide phosphides or silicophosphides are compounds containing anions composed of silicide (Si⁴⁻) and phosphide (P³⁻). They can be considered as mixed anion compounds. They are distinct from the phosphidosilicates, which have the phosphorus bonded to the silicon. Related compounds include the phosphide carbides, germanide phosphides, nitride silicides, and antimonide silicides.

One preparation method is to heat a metal phosphide with silicon in a silica tube. Phosphorus must be prevented from evaporating. Another method is to use a liquid tin flux.

Phosphide silicides may be present as minerals. They are under investigation as photovoltaic materials.^[1]

List

formula	system	space group	unit cell Å	volume	density	comment	ref
Li10.68Si5P	orthorhombic	Pnma	a = 10.2434, b = 4.2788, c = 23.9767 Z=4	1050.89	1.52	grey metallic; Si5 rings	[2]
Fe5PSi	hexagonal	P63cm	a=6.766 c=12.456 Z=6	493.83	6.82		[3]
Fe5(P,Si)3							[4]
Fe7(P,Si)3							[5]
(Fe,Ni)8(P,Si)3						Perryite	[6]
Ni2PSi	orthorhombic	Pbca	a=4.985 b=5.871 c=13.667	399.95	5.86		[7]
ZrCuSiP		P4/nmm	a=3.5671 c=9.4460			metallic	[8]
La4(P1−xSix)3-z	cubic	I43d					[9]
Ce4(P1−xSix)3-z	cubic	I43d					[9]
Ce4P1.77Si1.23	cubic	I43d	a=8.9359 Z=4	713.53	6.0474	black	[9]
Pr4(P1−xSix)3-z	cubic	I43d					[9]
Nd4(P1−xSix)3-z	cubic	I43d					[9]
Gd4Co13(Si, P)9		P6m2	a = 10.419, c = 37.27				[10]
Sm4Co13(Si, P)9		P6m2					[10]
Tb4Co13(Si, P)9		P6m2					[10]
Dy4Co13(Si, P)9		P6m2					[10]
Ho4Co13(Si, P)9		P6m2					[10]
Er4Co13(Si, P)9		P6m2					[10]
Hf27Si6P10		Immm	a = 3.5739, b = 18.623, c = 23.081, Z = 2		11.443	P2 groups	[11]