The thicknesses of oxide films formed in aqueous borate solutions were obtained by the spectrophotometric method after developing the interference colors by evaporating a verv thin film of gold or bismuth onto the oxide. The refractive index of the-stripped films was determined by the Becke immersion method as 1.57 to 1.58 a t 5 900 -4 wavelength. T h e dielectric constant was estimated as 9.8 f 0.5. Experimental data on the steady state ionic current density, I , through the oxide a s a function of the field strength, E, in the oxide could be represented by I = I D exp --(W -q a E ) / k T where I D = 2.24 X 107.1 cmr2, I.V = 1.3 f 0.15 eV, q = 3 e , a = 2.95 f 0.15 A.

The conductances of a number of tetra-n-alkylarn~no~~ium bromides and iodides have been measured in acetonitrile. Limiting equivalent conductances and dissociatio~l constants have been evaluated by two methods. Limiting equivalent ionic conductances have been evaluated from these results. Correlatioi~s have been made of the effect of ion size on the ionic conductances and on the relative order of magnitude of the dissociation constants. In an appendix the limiting ionic conductances of a number of other ions have been collected from the existing literature.

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