3059.     SCHENCK, R., DINGMANN, T., KIRSCHT, P. H., AND KORTENGRABER, A.  [Equilibrium Investigations of the Reduction Oxidation, and Carburization Process of Iron.  X.  (11).  The System:  Iron-Oxygen; Abnormal Oxidation; Activation of Iron Without Additions.]  Ztschr. anorg. Chem., vol. 206, 1932, pp. 73-96; Chem. Abs., vol. 26, 1932, p. 4571.

        Constancy of weight of Fe foil in a stream of CO₂-CO (19.15% CO₂) at high temperatures is due to the compensation of 2 effects, oxidation and the loss of small quantities of volatile Fe carbonyl.  In a CO-rich atmosphere Fe powder gives up Fe carbonyl, but its formation is suppressed if the CO₂ content of the atmosphere is above that corresponding tot he stable metal-wüstite limit.  The high absorption of O₂ observed with finely powdered Fe is attributed to the presence of active particles, which are oxidized in a CO₂-CO mixture, the composition of which is below the normal metal-wüstite range.