Phase Relations in the System Iron Oxide—Cr2O3 in Air

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Abstract
The quenching method has been used to determine approximate phase relations in the system iron oxide‐Cr2O3 in air. Only two crystalline phases, a sesquioxide solid solution (Fe2O3–Cr2O3) with corundum structure and a spinel solid solution (approximately FeO ·Fe2O3–FeO – Cr2O3), occur in this system at conditions of temperature and O2 partial pressure (0.21 atm.) used in this investigation. Liquidus temperatures increase rapidly as Cr2O3 is added to iron oxide, from 1591°C. for the pure iron oxide end member to a maximum of approximately 2265°C. for Cr2O3. Spinel(ss) is the primary crystalline phase in iron oxide‐rich mixtures and sesquioxide (ss) in Cr2O3–rich mixtures. These two crystalline phases are present together in equilibrium with a liquid and gas (po2= 0.21 atm.) at approximately 2075°C.

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