2312.     MOORE, W. J.  Parabolic Oxidation Rates of Metals.  Jour. Chem. Phys., vol. 18, 1950, p. 231; Chem. Abs., vol. 44, 1950, p. 5686.

        Constants, ∆H, ∆S, ∆F, of the transition-state theory (abs. 1283) for the oxidation of Al, Fe, Zr, Ti, Ni, Cu, Co, Zn, and Be are compared.  Except for Be, there is little variation in the ∆F values; hence reactions with high ∆H also have high ∆S.  A schematic diagram of the potential-energy barriers for vacancy formation and diffusion shows that, for equal diffusion barriers, the higher the heat of adsorption, the lower the effective ∆H.  Since a high heat of adsorption implies an immobile adsorbed film, it may also be associated with a large negative ∆S of adsorption; this may help explain the approximate constancy of ∆F.

        MORCOM, A. R.  See abs. 1629.

        MOREAU, J.  See abs. 190.