Zinc arsenide
| Names | |
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| Other names
trizinc diarsenide
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| Identifiers | |
3D model (
JSmol ) |
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| ChemSpider | |
ECHA InfoCard
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100.031.338 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| 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
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| Hazards | |
| GHS labelling: | |
  
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| Danger | |
| H301, H331, H350, H410 | |
| P201, P202, P222, P231+P232, P261, P264, P270, P271, P273, P280, P281, P301+P310+P330, P304+P340, P308+P313, P321, P370+P378, P391, P403+P233, P405, P422, P501 | |
| NFPA 704 (fire diamond) | |
| Safety data sheet (SDS) | [1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Zinc arsenide (Zn3As2) is a
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 of each other.[2]
References
- ^ a b c d "LTS Research Laboratories, Inc. Safety Data Sheet: Zinc Arsenide" (PDF). ltschem.com. Retrieved 2020-10-26.
- ^ doi:10.1063/1.371569.
- S2CID 98798806.
- S2CID 94409384.
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