Dinickel silicide

Crystal structure
__ Ni      __ Si metal-metal bonds not shown
General
Surname	Dinickel silicide
other names	Nickel silicide (ambiguous)
Ratio formula	Ni 2 Si
Brief description	gray to shiny metallic odorless solid
External identifiers / databases
CAS number 12059-14-2 EC number 235-033-1 ECHA InfoCard 100,031,836 PubChem 14767304 Wikidata Q18212011
properties
Molar mass	145.46 g mol −1
Physical state	firmly
density	7.2 g cm −3
Melting point	1309 ° C
solubility	practically insoluble in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 350i-372-317-410 P: 260-261-280-363-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dinickelsilicide is an inorganic chemical compound of nickel from the group of silicides .

Extraction and presentation

Dinickel silicide can be obtained by reacting nickel with silicon .

${\displaystyle \mathrm {2\ Ni+Si\longrightarrow Ni_{2}Si} }$

properties

Dinickelsilicide is a gray to metallic luster, odorless solid that is practically insoluble in water. It has an orthorhombic crystal structure with the space group Pbnm (space group no. 62, position 3) and the lattice parameters a = 7.06 Å , b = 4.99 Å and c = 3.72 Å. The crystal structure contains two crystallographically different nickel atoms. Both are coordinated by five silicon atoms, one in the shape of a trigonal bipyramid, one in that of a tetragonal pyramid. However, there is still a high-temperature modification with a hexagonal crystal structure. The connection has a resistance of about 24 to 30 µΩ / cm.

use

Nickel silicides have been widely studied as contact materials in microelectronic chips. Nickel silicide / silicon nanowire heterostructures can be used to fabricate field effect transistors .

Related links

In addition to dinickel silicide, at least five other nickel silicides stable at room temperature are known: Ni ₃ Si, Ni ₃₁ Si ₁₂ , Ni ₃ Si ₂ , NiSi and nickel disilicide (NiSi ₂ ). The phase diagram shows a total of eleven nickel silicides.

Individual evidence

1. ↑ ^{a b c d e f g} Data sheet Nickel silicide, 99% (metals basis excluding Co), Co 0.1–1% from AlfaAesar, accessed on July 5, 2016 ( PDF )(JavaScript required) .
2. ↑ ^{a b} Entry on dinickel silicide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
3. ↑ BA Julie, D. Knoesen, R. Pretorius, D. Adams: A study of the NiSi to NiSi2 transition in the NiSi binary system. In: Thin Solid Films. 347, 1999, p. 201, doi : 10.1016 / S0040-6090 (99) 00004-8 .
4. ↑ K. Toman: The structure of Ni ₂ Si. In: Acta Crystallographica , 5, 1952, pp. 329-331, doi: 10.1107 / S0365110X52001003 .
5. ↑ R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 644 ( limited preview in Google Book search).
6. ^ ^{A b} Yoshio Nishi, Robert Doering: Handbook of Semiconductor Manufacturing Technology, Second Edition . CRC Press, 2007, ISBN 978-1-4200-1766-3 , pp. 18 ( limited preview in Google Book search).
7. ^ William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 77 ( limited preview in Google Book search).