Materials Literature
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The oxidation of purified green silicon carbide in controlled atmospheres was studied by weight‐gain measurement and by observation of the surface reaction products, including optical measurement of the thickness of the oxide surface film. The rate of oxidation was much greater for silicon carbide in contact with flui…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structures of Some of the Rare Earth CarbidesF. H. Spedding, K. Gschneidner Jr., and A. H. DaaneCite this: J. Am. Chem. Soc. 1958, 80, 17, 4499–4503Publication Date (Print):September 1, 1958Publication History Published online1 May 2002Published inissue 1 Septemb…
Abstract A general method for describing the crystal orientation in a uniaxially oriented crystalline polymer is presented. It is shown that two orientation functions may be quantitatively evaluated from x‐ray diffraction data. The variation of these during mechanical and thermal treatment may be studied. These functi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Transitions in Collagen and Gelatin Systems1Paul J. Flory and Robert R. GarrettCite this: J. Am. Chem. Soc. 1958, 80, 18, 4836–4845Publication Date (Print):September 1, 1958Publication History Published online1 May 2002Published inissue 1 September 1958https://pubs.acs…
The refractive index of a sample of As2S3 was determined at three temperatures near 19°, 25°, and 31°C for selected wavelengths in the range 0.57 μ to 11.8 μ. A five term Sellmeier type dispersion equation was fitted to the averaged data reduced to 25°C; four of the constants were chosen to approximate an absorption c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon Paste ElectrodesRalph N. AdamsCite this: Anal. Chem. 1958, 30, 9, 1576Publication Date (Print):September 1, 1958Publication History Published online8 April 2003Published inissue 1 September 1958https://pubs.acs.org/doi/10.1021/ac60141a600https://doi.org/10.1021/ac6014…
Measurements of the absorption spectrum of Si, made with high resolution, near the main absorption edge, at various temperatures between 4.2\ifmmode^\circ\else\textdegree\fi{}K and 415\ifmmode^\circ\else\textdegree\fi{}K, have revealed fine structure in the absorption on the long-wavelength side of this edge. This str…
Abstract From quantitative data reported by various investigators, it is concluded that the primary passive film on iron has the following properties: (1) 25–100 Å thick, (2) equivalent to 0.01 coulomb/cm 2 , (3) can oxidize CrO − 2 to CrO −− 4 , (4) follows the (Flade) potential relation —0.58 + .058 p H (volts). All…
The internal friction of BaTiO 3 ceramics has been studied under various conditions. It depends on temperature, biasing field and vibration amplitude, but is nearly independent of frequency and porosity. It is concluded that its main part is not caused by the ceramic and domain structures but is the property of the si…
Abstract Die Korrosionsvorgänge und Passivitätserscheinungen der metallischen Werkstoffe sind elektrochemischer Natur. Auf Grund dieses Zusammenhanges werden an Hand potentiostatischer Stromspannungs‐diagramme die charakteristischsten Erscheinungsformen der Metallpassivität erläutert. Es wird gezeigt, daß der passive…
1. Brilliant cresyl blue accumulates in the vacuoles of Desmarestia munda and D. herbacea and the accumulated dye appears purple, indicating that the pH of the vacuolar sap is less than 1.0 or greater than 7.5. However, the expressed saps of these two brown algae have pH 1.0 or less and about 2.0, respectively. The ou…
Abstract Polyethylene containing large quantities of carbon black can be crosslinked by a chemical free radical mechanism utilizing the thermal decomposition of dicumyl peroxide as the source of free radicals. Crosslinking in the presence of different types of blacks was studied in a liquid paraffin model system. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrialkyl- and Triaryl(iso)cyanosilanes1T. A. Bither, W. H. Knoth, R. V. Lindsey Jr., and W. H. SharkeyCite this: J. Am. Chem. Soc. 1958, 80, 16, 4151–4153Publication Date (Print):August 1, 1958Publication History Published online1 May 2002Published inissue 1 August 1958https…
An idealized theoretical model of a yarn is assumed, and, after considering the stresses acting on a small element of the yarn, the conditions for radial equilibrium in the yarn are worked out. This leads to expressions for the tensile and transverse stresses in the fibres as functions of (i) the position in the yarn,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Addition of Silicon Hydrides to Olefinic Double Bonds. Part III. The Addition to Non-terminal Olefins in the Presence of Chloroplatinic AcidJohn C. Saam and John L. SpeierCite this: J. Am. Chem. Soc. 1958, 80, 15, 4104–4106Publication Date (Print):August 1, 1958Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman Spectra of Amino Acids and Related Compounds. VIII. Raman and Infrared Spectra of Imidazole, 4-Methylimidazole and Histidine1-3David Garfinkel and John T. EdsallCite this: J. Am. Chem. Soc. 1958, 80, 15, 3807–3812Publication Date (Print):August 1, 1958Publication Histo…
The infrared spectra of 17 amine hydrohalides have been measured in the solid state, in aqueous solutions, and in their conjugate amine. Their NH + stretching and scissoring bands are discussed.The stretching bands of hydrogen-bonded aliphatic and aromatic amine hydrohalides fall into the same part of the spectrum. In…
Neutron diffraction intensities have been computed for antiferromagnetic spin arrangements in the rock-salt-type structure. If the spin directions in the unit cell occur at relative angles other than 0\ifmmode^\circ\else\textdegree\fi{} or 180\ifmmode^\circ\else\textdegree\fi{}, the neutron scattering from powder spec…
Abstract Passivity in the transition metal alloys occurs at specific critical compositions which appear to be related to d ‐electron vacancies in the component metals and their tendency to fill with electrons. The d vacancies, measured in part by the magnetic saturation moment, favor formation of strongly chemisorbed…
Calcium aluminate glasses containing alkali oxides and iron oxide will transmit infrared radiation to about 6 μ and still have satisfactory working properties. Their refractive index, density, expansion, Young's modulus, modulus of rupture, fracture velocity, Knoop hardness, and some electrical and chemical properties…