The chemical state of fluorine and the effect of fluorine addition on the degree of polymerization of sili-cate network have been investigated for the CaO-SiO 2-CaF 2 and CaO-SiO 2-CaF 2-FeO x glasses using the X-ray photoelectron spectroscopy (XPS) and Mössbauer spectroscopy measurements. The F1s XPS spectra indicate that the fluorine is dominantly coordinated with calcium rather than silicon. The O1s XPS spectra for the CaO-SiO 2-CaF 2 glasses and the values of Fe 2 /Fe 3 obtained by Mössbauer spectra for the CaO-SiO 2-CaF 2-FeO x glasses indicate that CaF 2 addition does not depolymerize the silicate network for both systems. KEY WORDS: chemical state of fluorine; polymerization; silicate network; X-ray photoelectron spectroscopy; Mössbauer spectroscopy.
the recorded preparations, as pertinent references will be given below. Special mention should, however, be made of three papers embodying a1 tempts to deal with the problem according to the phase rule. Cameron and Robinson2 prepared a number of samples by saturating ferric sulfate solutions of various strengths with freshly precipitated ferric hydroxide, and shaking them a t 25' for 4 months. At the end of this time they found that the specific gravities of the solutions had become Certain special problems, to which time could not well be given, still need to be worked out. 2 See Dammer, "Handbuch der nnorganischen Chemie," 111, 332. Cameron and
The e. m. f. measurements of Hutchison and Chandlee on the activitycoefficient of sulfuric acid in glacial acetic acid can be accounted for on the basis of the Gronwall, La Mer and Sandved extension of the Debye-Hiickel theory on the assumption that sulfuric acid behaves as a binary electrolyte in this solvent with an "a" value equal to 11 A., for the concentration range m = 0.0025 to 0.038.
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