Materials Literature
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Water vapour atmospheres are known to raise the temperature of the endothermic reaction of clay minerals in differential thermal analyses. In isothermal kinetic studies of dehydroxylation, it is shown that a stationary state is attained depending on the operating temperature. The rate of dehydroxylation is a function…
A nearly linear relationship has been found to exist between the optical density and the thickness of evaporated carbon films. The determination of film thickness by density measurements is shown to have a number of advantages over measurement by interferometry, particularly for very thin films.
Adsorption–desorption cycles of water vapour on ‘stabilized’ standard cellulose from dryness to saturation have been determined at 20°C, 30°C and 40°C. The 4O°C and 30°C adsorption isotherms are closer together than the 30°C and 20°C ones. The hysteresis loop at low relative humidity is considerably wider at 40°C than…
A new type of scanning electrometer is described which is capable of measuring the charge on areas as small as 0.3 cm2 at a rate fast enough to show changes in charge distribution on a dielectric surface within intervals of the order of 30 msec. The minimum charge density which can be measured is about 0.6×10−9 coulom…
An account is given of what the author believes to occur when static charges are generated on polymeric insulating surfaces by contact with other surfaces. The subject is approached by trying to predict what will happen, for subsequent comparison with experiment, rather than by taking existing data and trying to expla…
An investigation of some substitution reactions of 1-methylpyrrole has indicated that the α-directing effect of the hetero nitrogen during nitration is even less than it is in pyrrole. 3-Nitro-1-methylpyrrole has been prepared together with the 2-isomer by direct nitration of 1-methylpyrrole as well as indirectly. The…
The Curie point of polycrystalline barium titanate is found to increase proportionally to the square of an applied planar (two-dimensionally isotropic) compressive stress.Received 29 June 1956DOI:https://doi.org/10.1103/PhysRev.105.57©1957 American Physical Society
Photolytic darkening and electron range were investigated for a series of silver chloride crystals cut from a single boule which was grown in vacuum by the Bridgman technique. The effect of annealing atmosphere on both the initial darkening rate and electron range is discussed. Darkening produced by absorption of ligh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Accommodation Coefficients on Gas-covered Tungsten, Nickel and Platinum1I. Amdur and L. A. GuildnerCite this: J. Am. Chem. Soc. 1957, 79, 2, 311–315Publication Date (Print):January 1, 1957Publication History Published online1 May 2002Published inissue 1 January 1957h…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Chloroform. II. Kinetics1aGeorge P. Semeluk and Richard B. BernsteinCite this: J. Am. Chem. Soc. 1957, 79, 1, 46–49Publication Date (Print):January 1, 1957Publication History Published online1 May 2002Published inissue 1 January 1957https://pubs.…
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This report discusses the application of electron magnetic resonance techniques to defect and impurity sites in solids, conduction electrons in metals, ferromagnetic, ferrimagnetic and antiferromagnetic materials. It also reviews the recent experiments on cyclotron resonance in semiconductors together with a brief acc…
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Certain of the criteria used for distinguishing vermiculites in clays from smectites are critically examined, and attention is drawn to the urgent need for further esearch in this field. Difficulties inherent in the differ-entiation are heightened by the common occurrence of interlayer con-tamination in the naturally…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Thermal Dissociation of Organic Compounds. XI. The Effects of the Substituents on the Thermal Dissociation of Urethans in Amine SolventTeruaki Mukaiyama and Masaru IwanamiCite this: J. Am. Chem. Soc. 1957, 79, 1, 73–76Publication Date (Print):January 1, 1957Publicatio…
The infrared spectra of finely powdered samples in pressed disks of KBr have been obtained for sulfamic acid, sodium and potassium sulfamates, and the corresponding deutero-compounds in the region from 4000 to 500 cm—1 at several temperatures. Satisfactory vibrational assignments could be made for the zwitterion model…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStress Activated Luminescence in X-Irradiated Alkali Halide CrystalsF. I. Metz, R. N. Schweiger, H. R. Leidler, and L. A. GirifalcoCite this: J. Phys. Chem. 1957, 61, 1, 86–89Publication Date (Print):January 1, 1957Publication History Published online1 May 2002Published inis…
Glasses have been made in the systems and with contents ranging between 50 and 87 mole%. The glasses were found to be semiconductors, those with the highest contents having a specific conductivity of the order of 10 −5 ohm −1 cm −1 at room temperature. The relationship between the specific conductivity, σ, and the tem…