Chromium nitride

Chromium nitride
IUPAC name

Chromium nitride
Other names

Chromium(III) nitride
Identifiers
CAS number 24094-93-7 Y
ChemSpider 81581 Y
Jmol-3D images Image 1
Properties
Molecular formula CrN
Molar mass 66.003 g/mol
Appearance Black powder
Density 5.9 g/cm3 [1]
Melting point

1770 ˚C (decomp.)[2]
Solubility in water Insoluble[3]
Thermochemistry
Std enthalpy of
formation ΔfHo298		 −117.15 kJ/mol [4]
Standard molar
entropy So298		 37.75 J K−1 mol−1 [4]
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Related compounds Dichromium nitride
 Y (verify) (what is: Y/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chromium nitride is a chemical compound of chromium and nitrogen with the formula CrN. It is very hard, and is extremely resistant to corrosion. It is an interstitial compound, with nitrogen atoms occupying the octahedral holes in the chromium lattice:[2] as such, it is not strictly a chromium(III) compound nor does it contain nitride ions (N3−). Chromium forms a second interstitial nitride, dichromium nitride, Cr2N.

Contents

Synthesis

Chromium(III) nitride can be prepared by direct combination of chromium and nitrogen at 800 °C:

2 Cr + N2 → 2 CrN

It can also synthesize by Physical Vapour Deposition technique such as Cathodic arc deposition.

Applications

CrN is used as a coating material for corrosion resistance and in metal forming and plastic moulding applications[5]. CrN is often used on medical implants and tools. CrN is also a valuable component in advanced multicomponent coating systems, such as CrAlN, for hard, wear-resistant applications on cutting tools[6].

Magnetism

The fundamental materials physics of CrN, giving rise to its favorable properties, has been debated recently in high-profile scientific journals such as Nature Materials[7] [8]. In particular, the importance of magnetism in both the low temperature and the high temperature phases has been demonstrated by means of quantum mechanical calculations of the electronic structure of the compound[9] [10] [11].

References

  1. ^ Chromium(III) nitride at webelements.com
  2. ^ a b Greenwood, Norman N.; Earnshaw, A. (1984). Chemistry of the Elements. Oxford: Pergamon. p. 480. ISBN 0-08-022057-6. 
  3. ^ http://www.alfa-chemcat.com/daten_msds/D/12149_-_D.pdf
  4. ^ a b NIST Chemistry Webbook
  5. ^ J. Vetter, Surf. Coat. Technol. 76, 719 (2005)
  6. ^ A. E. Reiter, V. H. Derflinger, B. Hanselmann, T. Bachmann, and B. Sartory, Surf. Coat. Technol. 200, 2114 (2005).
  7. ^ F. Rivadulla et al., Nature Mater. 8, 947 (2009)
  8. ^ B. Alling, T. Marten, and I. A. Abrikosov, Nature Materials 9, 283, (2010)
  9. ^ A. Filippetti and N. A. Hill, Phys. Rev. Lett. 85, 5166 (2000).
  10. ^ A. Herwadkar and W. R. L. Lambrecht, Phys. Rev. B 79, 035125 (2009)
  11. ^ B. Alling, T. Marten, and I. A. Abrikosov, Physical Review B, 82, 184430 (2010)