3073.     SCHENCK, R., SEMILLER, H., AND FALCKE, V.  [Experimental Studies on the Reduction and Carbide Formation of Iron.]  Ber. deut. chem. Gesell., vol. 40, 1907, pp. 1704-1725; Jour. Soc. Chem. Ind., 1907, p. 692; Chem. Abs., vol. 1, 1907, p. 2772.

        Gas pressures at temperatures 550°-700° were measured in the following systems:  (1) Fe, FeO, C (amorphous), CO, CO₂; (2) Fe, FeO, graphite, CO, CO₂; (3) Fe₃C, FeO, C (amorphous), CO, CO₂; (4) Fe₃O₄; FeO, C (amorphous), CO, CO₂.  Moreover, in order to define the state of these systems completely, the composition of the gas phase was determined.  The data enabled prediction of the proper conditions for the formation of Fe carbide, at any temperature, or for the formation of any of the other phases.  The authors conclude that the equilibrium C+CO₂=2 CO varies with the form of C employed.  Unfortunately the observations could not be carried above 700° on account of complications owing to the formation of mixed crystals between Fe and cementite.  Mn lowers the pressure of the C oxides to a striking degree.

        SCHENCK, R., DINGMANN, T., KIRSCHT, P. H., AND KORTENGRABER, A.  [Equilibrium Investigations of the Reduction, Oxidation, and Carburization Processes of Iron.  X.  (11).  The System:  Iron-Oxygen; Abnormal Oxidation; Activation of Iron Without Additions.]  See abs. 3059.

        SCHENCK, R., DINGMANN, T., KIRSCHT, P. H., AND WESSELKOCK, H.  [Equilibrium Studies of the Reduction, Oxidation, and Carburization Processes of Iron.  VIII.  (9).  System Iron-Oxygen.]  See abs. 3057.

        SCHENCK, R., DINGMANN, T., BÖKMANN, J., EBERT, W., KESTING, W., LEPETIT, G., MÜLLER, J., AND PRATJE, W.  [Equilibrium Relations in the Reduction, Oxidation, and Carburization of Iron.  IV.  (5).  Iron Carbide, Iron Oxides, and Iron Under an Atmosphere of Carbon Monoxide and Carbon Dioxide.]  See abs. 3053.

        ---------.  [Equilibrium Relations in the Reduction, Oxidation, and Carburization of Iron.  III.  (4).  Systematic Investigations of the Oxidation-Reduction Relations Existing in the Systems of the Iron Oxides With Iron, Carbon Monoxide and Carbon Dioxide.]  See abs. 3052.