Abstract
The chemical state of thermochemically treated chromium(III) oxide
(Cr2O3) with various carbonates was analyzed by
far-infrared (far-IR) spectroscopy (spectral region 700-25 cm−1).
Non-toxic Cr2O3 was oxidized with potassium, sodium, and
calcium carbonate, respectively, to toxic Cr(VI) and Cr(V) compounds during thermal
treatment at 1000 °C. In reverse, thermochemical treatment of
Cr2O3 with magnesium carbonate lead to the formation of
the Cr(III) compound MgCr2O4. Higher temperatures (>1200
°C) or reducing atmospheric conditions prevent the formation of Cr(VI)/Cr(V)
compounds, too. Additionally, it was found that polyethylene powder with a low
particle size (<70 μm) is favorable for the collection of good far-IR spectra of
inorganic powders.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription