Copper silicide

Copper silicide
Identifiers
CAS Number	12159-07-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	29356049;
EC Number	235-286-8;
PubChem CID	6336988;
	InChI InChI=1S/5Cu.Si Key: JUZTWRXHHZRLED-UHFFFAOYSA-N;
	SMILES [Si].[Cu].[Cu].[Cu].[Cu].[Cu];
Properties
Chemical formula	Cu5Si
Molar mass	345.8155 g/mol
Appearance	silver powder
Melting point	825 °C (1,517 °F; 1,098 K)
Hazards
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	verify (what is ?)
	Infobox references

Copper silicide can refer to either Cu
4Si^[2] or pentacopper silicide, Cu
5Si.

Pentacopper silicide is a binary compound of silicon with copper. It is an intermetallic compound, meaning that it has properties intermediate between an ionic compound and an alloy. This solid crystalline material is a silvery solid that is insoluble in water. It forms upon heating mixtures of copper and silicon.

Applications

Copper silicide thin film is used for passivation of copper interconnects, where it serves to suppress diffusion and electromigration and serves as a diffusion barrier.^[3]^{[better source needed]}

Copper silicides are invoked in the Direct process, the industrial route to organosilicon compounds. In this process, copper, in the form of its silicide, catalyses the addition of methyl chloride to silicon. An illustrative reaction affords the industrially useful dimethyldichlorosilane:^[4]

2 CH₃Cl + Si → (CH₃)₂SiCl₂

References

↑ ^1.0 ^1.1 ^1.2 NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0150.html.
↑ CRC Handbook of Chemistry and Physics, 49th edition, "Physical constants of inorganic compounds" (p. B-198).
↑ "Copper silicide passivation for improved reliability - US Patent 6869873". Archived from the original on 2007-09-29. https://web.archive.org/web/20070929082943/http://www.patentstorm.us/patents/6869873.html. Retrieved 2007-02-10.
↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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Original source: https://en.wikipedia.org/wiki/Copper silicide. Read more

[PGCH-1] 1.0 ^1.1 ^1.2 NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0150.html.

[2] CRC Handbook of Chemistry and Physics, 49th edition, "Physical constants of inorganic compounds" (p. B-198).

[3] "Copper silicide passivation for improved reliability - US Patent 6869873". Archived from the original on 2007-09-29. https://web.archive.org/web/20070929082943/http://www.patentstorm.us/patents/6869873.html. Retrieved 2007-02-10.

[4] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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[3]

[4]

v t e Copper compounds
Cu(0,I)	Cu₅Si
Cu(I)	CuBr CuCN CuCl CuF CuH CuI Cu₂C₂ Cu₂Cr₂O₅ Cu₂O CuOH CuNO₃ Cu₃P Cu₂S CuSCN
Cu(I,II)	Cu₃H₄O₈S₂
Cu(II)	Cu(BF₄)₂ CuBr₂ CuC₂ CuCO₃ Cu(CN)₂ Cu(ClO₃)₂ CuCl₂ CuF₂ Cu(NO₃)₂ Cu₃(PO₄)₂ Cu(N₃)₂ CuO CuO₂ Cu(OH)₂ CuI₂ CuS CuSO₄ Cu₃(AsO₄)₂
Cu(III)	K₃CuF₆ Cu₂O₃
Cu(IV)	Cs₂CuF₆ Rb₂CuF₆

Identifiers
CAS Number	12159-07-8^Y
3D model (JSmol)	Interactive image
ChemSpider	29356049
EC Number	235-286-8
PubChem CID	6336988
InChI InChI=1S/5Cu.Si Key: JUZTWRXHHZRLED-UHFFFAOYSA-N
SMILES [Si].[Cu].[Cu].[Cu].[Cu].[Cu]
Properties
Chemical formula	Cu₅Si
Molar mass	345.8155 g/mol
Appearance	silver powder
Melting point	825 °C (1,517 °F; 1,098 K)
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m³ (as Cu)^[1]
REL (Recommended)	TWA 1 mg/m³ (as Cu)^[1]
IDLH (Immediate danger)	TWA 100 mg/m³ (as Cu)^[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is ^YN ?)
Infobox references

Copper silicide

Topic: Chemistry

Applications

References