Computer Science
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..781m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.781-802
Computer Science
3
Scientific paper
The role of chromium in oxide and silicate systems is examined by reviewing typical features of phase diagrams involving this component. Liquidus, solidus and sub-solidus phase relations are discussed for a number of binary, ternary, quaternary and multicomponent systems having a bearing on the behavior of chromium in minerals and rocks. The most dominant features of the liquidus surface of Cr 2 O 3 -containing silicate systems are the large liquid miscibility gaps and the dominance of the spinel (chromite) stability field. Subsolidus relations of especial interest are those involving spinel phases (chromites). The oxygen pressure of the gas phase is an important parameter in chromium oxide-containing systems, partly because iron oxide is a common constituent of such systems, partly because chromium itself may occur in different states of oxidation. At the lowest oxygen pressures considered, a significant proportion of the chromium may be present as Cr 2+ , and at the highest oxygen pressures as Cr 6+ .
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