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An arsenide hydride or hydride arsenide is a chemical compound containing
hydride (H− ) and
arsenide (As3− ) 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.
[1]
Properties
Arsenide hydrides are under investigation as unconventional superconductors.
[2]
The hydride ions can be replaced by fluoride or oxide ions to yield variations in composition.
[3]
Reactions
when heated to 800° CaFeAsH forms three phases.
[4]
2CaFeAsH → Ca + CaFe2 As2 + H2
name
formula
form
space group
unit cell
volume
density
appearance
properties
reference
LiCa3 As2 H
orthorhombic
Pnma
a = 11.4064(7) Å, b = 4.2702(3) Å, c = 11.8762 Z=4
red
band gap 1.4 eV
[5]
Ca14 As6 C0.5 ,NH5
tetragonal
P 4/mbm
a = 15.749, c = 9.1062, Z = 4
red
band gap 1.6 eV
[5]
CaFeAsH
tetragonal
P 4/nmm
a = 0.3878 c = 0.8260
superconductor
[6]
CaFeAsF1-x Hx
non superconductor
[4]
CaFe1−x Cox AsH
tetragonal
P 4/nmm
a increases and c decreases with x
superconducting 23 K at x= 0.09
[7]
K2 Cr3 As3 H
[8]
K1−δ Cr3 As3 Hx x<0.45
Superconductor Tc=5.8 K
[9]
[10]
Lithium tristrontium diarsenide hydride
Sr3 LiAs2 H
orthorhombic
Pnma
a = 12.034, b = 4.4698, c = 12.5907; V = 677.2 Å3
Zintl phase; semiconductor; diamagnetic
[11]
LaFeAsO1−x Hx (x <0.53)
superconductor T c =36 K with x =0.3
[12]
La2 Ti2 As2 H2.3
tetragonal
I 4/mmm
a=3.9595 c=18.0986
283.742
[13]
La2 V2 As2 Hx
tetragonal
I 4/mmm
a=3.9561 c=17.909
280.030
[13]
La2 Cr2 As2 Hx
tetragonal
I 4/mmm
a=3.9934 c=17.380
277.17
[13]
La2 Mn2 As2 Hx
tetragonal
I 4/mmm
a=4.0556 c=17.46
287.2
[13]
LaMnAsO1−xHx (x=0−0.73)
ferromagnetic
[3]
CoLaAsH0.78x
orthorhombic
I41 md
a=4.1739 c=14.64
254.8
black
[14]
NiLaAsH0.69
orthorhombic
I41 md
a=4.1660 c=14.5993
253.37
black
[14]
CuLaAsH0.78
orthorhombic
I41 md
a=4.2302 c=14.5780
260.86
7.08
black
[14]
LaZn0.5 AsHx
hexagonal
P6/mmm
a=4.200 c=4.244
64.81
black
[14]
CeFeAsO1−x Hx (x<0.5)
tetragonal
P 4/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
[12]
[1]
NdFeAs(O,H)
superconductor Tc=40K
[15]
SmFeAsO1−x Hx (x<0.5)
superconductor Tc=55 K at x = 0.2.
[4]
Sm2 Mn2 As2 Hx
tetragonal
I 4/mmm
a=3.9251 c=16.67
256.7
[13]
GdFeAsO1−x Hx
[12]
References
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