3054.     SCHENCK, R.  [Equilibrium in the Reduction, Oxidation, and Carburization of Iron.  V.]  Ztschr. anorg. Chem., vol. 167, 1927, pp. 315-328; Chem. Abs., vol. 22, 1928, p. 2132.

        Summary of the previous papers in this series.  The 3-dimensional equilibrium model of the system Fe-C-O₂ is discussed, the system being under an atmosphere of CO and CO₂ and at various temperatures 500°-1,000°.  An isobar at 1 atm. shows the concentrations of CO and CO₂ and the temperatures at which the following will be stable:  Fe₃C, Fe₃O₄, wüstite, oxoferrite, and oxoaustenite.  Isotherms at 50° intervals 542°-1,000° show the range of stability of the above-mentioned substances when under pressures ranging from 0-1,200 mm.  The remarkable influence that impurities have upon the equilibrium is stressed again.  The effect of MgO is given in detail.  Problems for future solutions are:  (1) The systematic investigations of the influences of impurities; and (2) the determination of the composition of the solid solutions oxoferrite and oxoaustenite as they exist under various gas pressures and compositions.