Thermal Treatment of Chromium(III) Oxide with Carbonates Analyzed by Far-Infrared Spectroscopy | Zendy

Christian Vogel | Zendy; Jan Stemann | Zendy; K. Holldack | Zendy; Ryo Sekine | Zendy; Ewelina Lipiec | Zendy; Christian Adam | Zendy

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Thermal Treatment of Chromium(III) Oxide with Carbonates Analyzed by Far-Infrared Spectroscopy

Author(s) -

Christian Vogel,

Jan Stemann,

K. Holldack,

Ryo Sekine,

Ewelina Lipiec,

Christian Adam

Publication year - 2015

Publication title -

applied spectroscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.415

H-Index - 110

eISSN - 1943-3530

pISSN - 0003-7028

DOI - 10.1366/15-07878

Subject(s) - chromium , chemistry , infrared spectroscopy , magnesium , inorganic chemistry , potassium , carbonate , spectroscopy , oxide , potassium carbonate , sodium carbonate , infrared , sodium , nuclear chemistry , organic chemistry , optics , physics , quantum mechanics

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.

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