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Zinc arsenide

Topic: Chemistry

 From HandWiki - Reading time: 2 min
Short description: Chemical compound of zinc and arsenic
Zinc arsenide
Names
Other names
trizinc diarsenide
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 234-486-2
Properties
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)
Insoluble[1]
Structure
Tetragonal
Hazards
Safety data sheet [1]
GHS pictograms GHS05: CorrosiveGHS06: ToxicGHS08: Health hazard
GHS Signal word Danger
H301, H331, H350, H410
P201, P202, P222, P231+232, P261, P264, P270, P271, P273, P280, P281, P301+310+330Script error: No such module "Preview warning".Category:GHS errors, P304+340, P308+313, P321, P370+378, P391, P403+233, P405, P422, P501
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored 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

  1. ↑ 1.0 1.1 1.2 1.3 "LTS Research Laboratories, Inc. Safety Data Sheet: Zinc Arsenide". https://www.ltschem.com/msds/Zn3As2.pdf. 
  2. ↑ 2.0 2.1 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. Bibcode: 1999JAP....86.5614B. 
  3. ↑ Okamoto, H. (1992). "The As-Zn (arsenic-zinc) system". Journal of Phase Equilibria 13 (2): 155–161. doi:10.1007/BF02667479. 
  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. 




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