Editorial Feature

Chromium Oxide (Cr2O3) Nanoparticles – Properties, Applications

Nanoparticles are the altered form of basic elements with different atomic and molecular properties. Applications of nanoparticles vary from cosmetics to biomedicine, from electronics to optics. This article will look into the properties and applications of chromium oxide nanoparticles.

Chromium oxide (Cr2O3) occurs in nature as a rare mineral called eskolaite. These nanoparticles are predominantly used as dyes. Some of the synonyms of chromium oxide nanoparticles are chromsaeureanhydrid, trioxochromium, monochromium trioxide, chromia, green cinnabar, chrome ochre and chromtrioxid. Chromium belongs to Block D, Period 4 while oxygen belongs to Block P, Period 2 of the periodic table.

Chemical Properties

The following tables list the chemical properties of chromium oxide.

Chemical Data
Chemical symbol Cr2O3
CAS No 1308-38-9
Group Chromium 6
Oxygen 16
Electronic configuration Chromium [Ar] 3d54s1
Oxygen [He] 2s2 2p4
Chemical Composition
Element Content (%)
Chromium 68.46
Oxygen 31.58

Physical Properties

Chromium oxide nanoparticles appear in the form of green crystals with a nearly spherical morphology. The table below provides the physical properties of these nanoparticles.

Properties Metric Imperial
Density 5.22 g/cm3 0.188 lb/in3
Molar Mass 151.86 g/mol -

Thermal Properties

The thermal properties of chromium oxide nanoparticles are given in the table below:-

Properties Metric Imperial
Melting Point 2435°C 4415°F
Boling Point 4000°C 7232°F


The following are the chief applications of chromium oxide:

  • In glasses, inks and paints
  • As the colorant in ‘chrome green’ and ‘institutional green’
  • Precursor to the magnetic pigment (chromium dioxide)
  • In the process of stropping knives.


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