1056.    FORRESTIER, H., AND KIEHL, J. P.  [Effect of Gaseous Adsorption on the Velocity of Reaction of Metallic Oxides.]  Compt. Rend., vol. 229, 1949, pp. 47-49; Chem. Abs., vol. 44, 1950, p. 403.

       Yields of ferrite from powdered Fe₂O₃ and NiO heated in atmospheres of H₂O, CO₂, O₂, air, N₂, Ne, A, and He at 600°, 650°, and 700° plotted as isotherms against absolute temperature of liquefaction of the gases give smooth curves except for N₂, which gives a low yield.  Yields decrease with particle size.  The explanation advanced is that the gases are most readily adsorbed in the order named, and adsorption swells the particles till they shatter.