Arsenide hydride

An arsenide hydride or hydride arsenide is a chemical compound containing hydride and arsenide ions in a single phase. They are in the class of mixed anion compounds.

Preparation

Arsenide hydride compounds may be produced by heating metal hydride and metal arsenide mixtures under pressure.

Properties

Arsenide hydrides are under investigation as unconventional superconductors.
The hydride ions can be replaced by fluoride or oxide ions to yield variations in composition.

Reactions

when heated to 800° CaFeAsH forms three phases.
2CaFeAsH → Ca + CaFe₂As₂ + H₂

name	formula	form	space group	unit cell	volume	density	appearance	properties	reference
	LiCa₃As₂H	orthorhombic	Pnma	a = 11.4064 Å, b = 4.2702 Å, c = 11.8762 Z=4			red	band gap 1.4 eV
	Ca₁₄As₆C_0.5,NH₅	tetragonal	P4''/mbm	a'' = 15.749, c = 9.1062, Z = 4			red	band gap 1.6 eV
	CaFeAsH	tetragonal	P4/nmm	a = 0.3878 c = 0.8260				superconductor
	CaFeAsF_1−xH_x							non superconductor
	CaFe_1−xCo_xAsH	tetragonal	P4/nmm	a increases and c decreases with x				superconducting 23 K at x= 0.09
	K₂Cr₃As₃H
	K_1−δCr₃As₃H_x x<0.45							Superconductor Tc=5.8 K
Lithium tristrontium diarsenide hydride	Sr₃LiAs₂H	orthorhombic	Pnma	a = 12.034, b = 4.4698, c = 12.5907; V = 677.2 Å³				Zintl phase; semiconductor; diamagnetic
	LaFeAsO_1−xH_x							superconductor T_c=36 K with x=0.3
	La₂Ti₂As₂H_2.3	tetragonal	I4/mmm	a=3.9595 c=18.0986	283.742
	La₂V₂As₂H_x	tetragonal	I4/mmm	a=3.9561 c=17.909	280.030
	La₂Cr₂As₂H_x	tetragonal	I4/mmm	a=3.9934 c=17.380	277.17
	La₂Mn₂As₂H_x	tetragonal	I4/mmm	a=4.0556 c=17.46	287.2
	LaMnAsO1−xHx							ferromagnetic
	CoLaAsH_0.78x	orthorhombic	I4₁md	a=4.1739 c=14.64	254.8			black
	NiLaAsH_0.69	orthorhombic	I4₁md	a=4.1660 c=14.5993	253.37			black
	CuLaAsH_0.78	orthorhombic	I4₁md	a=4.2302 c=14.5780	260.86	7.08		black
	LaZn_0.5AsH_x	hexagonal	P6/mmm	a=4.200 c=4.244	64.81			black
	CeFeAsO_1−xH_x	tetragonal	P4/nmm	a=3.95386 c=8.5926 at x=0.4				superconducting 0.1 < x < 0.4; T_c=47 K with x=0.25
	NdFeAs							superconductor Tc=40K
	SmFeAsO_1−xH_x							superconductor Tc=55 K at x = 0.2.
	Sm₂Mn₂As₂H_x	tetragonal	I4/mmm	a=3.9251 c=16.67	256.7
	GdFeAsO_1−xH_x