The system chromium-oxygen at high oxygen pressures

Details The system chromium-oxygen at high oxygen pressures The system chromium-oxygen at high oxygen pressures

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..803w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.803-817

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Six intermediate oxides exist between the known CrO 3 and Cr 2 O 3 oxides in the Cr-O system. The stability regions have been mapped by reacting oxide materials with oxygen at pressures to 3 kbar. The tetravalent dioxide stability field terminates at an invariant point at 35 bar and 370°C. CrO 2 is not stable at atmospheric pressure, but its stability field widens at high pressure, and above 70 kbar it is the only stable oxide in the system. The other intermediate oxides are shown by infra-red spectroscopy to be mixed chromium chromates and dichromates. These become less stable at the highest oxygen pressures attained.

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