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Arsenidogermanates are chemical compounds that contain anions with arsenic bonded to germanium. They are in the category of tetrelarsenides, pnictidogermanates, or tetrelpnictides.

Germanium forms two arsenides: GeAs and GeAs₂.^[1]

List

formula	formula weight	crystal system	space group	unit cell	volume	density	comments	ref
LiGe₃As₃		orthorhombic	Pbam	a=10.0862 b=15.7612 c=3.7403 Z=4	594.60	5.01		^[2]
Li₅GeAs₃							black	^[3]
NaGe₆As₆	908.05	monoclinic	C2/m	a = 22.063, b = 3.8032, c = 7.2020, β = 92.744°, Z = 2	603.64	5.00	needles	^[4]
Na₁₀Ge₂As₆		monoclinic	P12₁/n1	a=13.531 b=7.544 c=8.298 β = 90.2° Z=2	847.0			^[5]
K₂GeAs₂		orthorhombic	Ibam	a = 13.292, b = 7.028, c = 6.548 Z = 4			moisture sensitive needles	^[6]
KGe₃As₃	481.53	orthorhombic	Pnma	a=9.993, b=3.7664, c=18.607 Z=4	700.34	4.568		^[7]
K₂Ge₃As₃	520.73	orthorhombic	Pnnm	a=14.1466 b=16.300 c=3.7489 Z=4	864.47	4.001	fibrous metallic	^[8]
K₂NaGaAs₂			Ibam	a=6.733 b=14.809 c=6.574 Z=4	655.5	3.250		^[9]
KCdGeAs₂		triclinic	P1	a = 8.004, b = 8.402, c = 8.703, α = 71.019°, β = 75.257°, γ = 73.746°, Z=4			band gap 0.8 eV; Ge₂As₆ units	^[10]
RbCdGeAs₂		triclinic	P1	a = 8.269, b = 8.452, c = 8.735, α = 71.163°, β = 75.601°, γ = 73.673°, Z=4			Ge₂As₆ units	^[10]
Sr₃Ge₂As₄							red metallic; 1D As₃GeGeAs₃ units	^[11]
K₅In₅Ge₅As₁₄		monoclinic	C2/m	a=40.00,b=3.925,c=10.299, β=99.97°, Z=8	1592	4.55	air sensitive; layered	^[12]
K₈In₈Ge₅As₁₇		monoclinic	P2₁/c	a=18.394,b=19.087,c=25.360, β=105.71°, Z=4	8571	4.45	air sensitive; layered	^[12]
RbGe₃As₃	528	orthorhombic	Pnma	a=10.166 b=3.7595 c=19.028 Z=4	727.2	4.823		^[7]
Rb(Ge_1.5In_0.5)As₂(As_1.5Ge_0.5)		orthorhombic	Cmc2₁	a = 3.799, b = 16.50, c = 12.24, Z = 4	767	4.589		^[13]
Rb_XGe_2−XIn_XAs₄								^[13]
I₈As₂₁Ge₂₅	4403	cubic	Pm3n	a=10.5963 Z=1	1189.8	6.1431	colourless	^[14]
Cs₅GeAs₃							metallic; unstable in air; GeAs₃ units	^[15]
BaGe₂As₂		tetragonal	P4₂mc	a=7,786 c=8.664 Z=4	525.2	5.47	metallic	^[16]
Ba₄GeAs₄							dark metallic; GeAs₄ units	^[17]
Re₃Ge_0.6As_6.4								^[18]
Re₃GeAs₆	1080.75	cubic	Im3m	a = 8.73202 Z=4	665.75	10.78	n-type semiconductor	^[18]
AuGeAs		monoclinic	Cc	a 7.2729, b 6.2953, c 6.3067, β 119.209°				^[19]
K_XGe_2−XTl_XAs₄								^[13]

References

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