Zinc arsenide

Zinc arsenide
Names
	Other names trizinc diarsenide
Identifiers
CAS Number	12006-40-5;
3D model (JSmol)	Interactive image;
ChemSpider	21242020 ;
ECHA InfoCard	100.031.338
EC Number	234-486-2;
PubChem CID	25147458;
CompTox Dashboard (EPA)	DTXSID00893156 ;
	InChI InChI=1S/2As.3Zn Key: RHKSESDHCKYTHI-UHFFFAOYSA-N;
	SMILES [Zn].[Zn]=[As].[Zn]=[As];
Properties
Chemical formula	Zn3As2
Molar mass	345.984 g/mol
Appearance	Silver grey[1]
Density	5.53 g/cm3[1]
Melting point	1,015 °C (1,859 °F; 1,288 K)
Solubility in water	Insoluble[1]
Structure
Crystal structure	Tetragonal
Hazards
Safety data sheet	[1]
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H331, H350, H410
GHS precautionary statements	P201, P202, P222, P231+232, P261, P264, P270, P271, P273, P280, P281, P301+310+330, P304+340, P308+313, P321, P370+378, P391, P403+233, P405, P422, P501
NFPA 704 (fire diamond)	0 4 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Zinc arsenide (Zn₃As₂) is a binary compound of zinc with arsenic which forms gray tetragonal crystals. It is an inorganic semiconductor with a band gap of 1.0 eV.[2]

Synthesis and reactions

Zinc arsenide can be prepared by the reaction of zinc with arsenic

3 Zn + 2 As → Zn₃As₂

Structure

Zn₃As₂ has a room-temperature tetragonal form that converts to a different tetragonal phase at 190°C and to a third phase at 651°C.[3] In the room-temperature form, the zinc atoms are tetrahedrally coordinated and the arsenic atoms are surrounded by six zinc atoms at the vertices of a distorted cube. The crystalline structure of zinc arsenide is very similar to that of cadmium arsenide (Cd₃As₂), zinc phosphide (Zn₃P₂) and cadmium phosphide (Cd₃P₂). These compounds of the Zn-Cd-P-As quaternary system exhibit full continuous solid-solution.[4]

Electronic structure

Its lowest direct and indirect bandgaps are within 30 meV or each other.[2]

References

"LTS Research Laboratories, Inc. Safety Data Sheet: Zinc Arsenide" (PDF). ltschem.com. Retrieved 2020-10-26.
Botha, J. R.; Scriven, G. J.; Engelbrecht, J. A. A.; Leitch, A. W. R. (1999). "Photoluminescence properties of metalorganic vapor phase epitaxial Zn3As2". Journal of Applied Physics. 86 (10): 5614–5618. doi:10.1063/1.371569.
Okamoto, H. (1992). "The As-Zn (arsenic-zinc) system". Journal of Phase Equilibria. 13 (2): 155–161.
Trukhan, V. M.; Izotov, A. D.; Shoukavaya, T. V. (2014). "Compounds and solid solutions of the Zn-Cd-P-As system in semiconductor electronics". Inorganic Materials. 50 (9): 868–873. doi:10.1134/S0020168514090143.

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[LTS-MSDS-1] "LTS Research Laboratories, Inc. Safety Data Sheet: Zinc Arsenide" (PDF). ltschem.com. Retrieved 2020-10-26.

[PL-Zn3As2-2] Botha, J. R.; Scriven, G. J.; Engelbrecht, J. A. A.; Leitch, A. W. R. (1999). "Photoluminescence properties of metalorganic vapor phase epitaxial Zn3As2". Journal of Applied Physics. 86 (10): 5614–5618. doi:10.1063/1.371569.

[3] Okamoto, H. (1992). "The As-Zn (arsenic-zinc) system". Journal of Phase Equilibria. 13 (2): 155–161.

[Trukhan-4] Trukhan, V. M.; Izotov, A. D.; Shoukavaya, T. V. (2014). "Compounds and solid solutions of the Zn-Cd-P-As system in semiconductor electronics". Inorganic Materials. 50 (9): 868–873. doi:10.1134/S0020168514090143.