Zinc arsenide

Crystal structure
__ Zn 2+      __ As 3−
General
Surname	Zinc arsenide
other names	Trizinc diarsenide
Ratio formula	Zn 3 As 2
Brief description	gray odorless solid
External identifiers / databases
CAS number 12006-40-5 EC number 234-486-2 ECHA InfoCard 100,031,338 PubChem 25147458 Wikidata Q8072291
properties
Molar mass	346.01 g mol −1
Physical state	firmly
density	5.53 g cm −3 (25 ° C)
Melting point	1015 ° C
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-331-410 P: 261-273-301 + 310-311-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Zinc arsenide is an inorganic chemical compound of zinc from the group of arsenides .

Extraction and presentation

Zinc arsenide can be obtained by reacting zinc with arsenic under nitrogen at 700 ° C.

${\displaystyle \mathrm {3\ Zn+2\ As\longrightarrow Zn_{3}As_{2}} }$

properties

Zinc arsenide is a gray solid with metallic conductivity. Acids cause decomposition with evolution of arsine .

${\displaystyle \mathrm {Zn_{3}As_{2}+H_{2}SO_{4}\longrightarrow 3\ ZnSO_{4}+2\ AsH_{3}} }$

The compound has a tetragonal body- centered crystal structure (a = 1178 pm, c = 2364 pm) with the space group I 4 ₁ cd (space group no. 110) . It contains three crystallographically different zinc atoms, but they are all tetrahedrally coordinated by arsenic atoms. At elevated temperature, conversion into other structures takes place. The compound is a II-V semiconductor .

The black-gray zinc diarsenide ZnAs ₂ , which is formed with an excess of arsenic under otherwise identical conditions, melts at 768 ° C. and has a monoclinic crystal structure with the space group P 2 ₁ / c (No. 14) .

use

Zinc arsenide is used for doping and for the production of arsine in the semiconductor industry.

Individual evidence

1. ↑ ^{a b c d e} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1033.
2. ↑ ^{a b c d e} data sheet Zinc arsenide, pieces, 99.995% trace metals basis from Sigma-Aldrich , accessed on April 20, 2014 ( PDF ).
3. ↑ espimetals: Zinc Arsenide Zn3As2 - Zinc Arsenide Zn3As2 , accessed on Sunday, April 20, 2014
4. ^ Edward D. Palik: Handbook of Optical Constants of Solids . Academic Press, 1998, ISBN 0-12-544423-0 , pp. 595 ( limited preview in Google Book search).
5. ^ Jeanne Mager Stellman: Encyclopaedia of Occupational Health and Safety: Chemical, industries and occupations . International Labor Organization, 1998, ISBN 92-2109816-8 , pp. 83.24 ( limited preview in Google Book search).
6. ^ Anthony C. Jones, Michael L. Hitchman: Chemical Vapor Deposition: Precursors, Processes and Applications . Royal Society of Chemistry, 2009, ISBN 0-85404-465-5 , pp. 546 ( limited preview in Google Book search).