Materials Literature
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Verbindung des Cyclopentandion-dicarbonsure-dithylesters (V) umgesetzt. Das wahrscheinlich zuerst entstandene Reaktionsprodukt VI wurde nicht isoliert. Dagegen konnte der thylester VII (C18H18Oh, Schmp. 134-135, korr.) erhalten werden. Die Tatsache, da hierbei der Lactonring geschlossen worden ist, beweist, da die ter…
The permittivity and power factor of ceramic barium titanate and barium titanate solid solutions have been measured as a function of time, starting from the time of cooling the material through the Curie point. Both parameters decrease linearly with log t over periods extending to several years. A theory is proposed w…
Effusion measurements have been carried out with uranium dioxide over a temperature range from 1600° to 2800°K and a pressure range from 10—8 to 6 mm. Four different isotopic compositions, three different effusion cells and two different apparatuses were used. The results are concordant and demonstrate that the oxide…
The phenomenological theory of the thermoelectric effects in a cubic or isotropic electronic conductor is developed. It is shown that, as a consequence of the appropriate Onsager relation, the "gauge" adopted here for the thermoelectric coefficients of a single substance is such that the second Kelvin relation takes a…
The theory of Stevens for covalent XY 6 complexes is developed for the cases of d 3 and d 5 with low symmetry, and compared with the magnetic resonance results of the preceding paper. The effect of the coupling to the doublet states on the spin Hamiltonian constants for the d 3 complexes is found to be small compared…
ADVERTISEMENT RETURN TO ISSUEPREVBook and Media Revie...Book and Media ReviewNEXTThe chemistry and reactivity of collagenArthur W. Thomas Cite this: J. Chem. Educ. 1956, 33, 12, 652Publication Date (Print):December 1, 1956Publication History Received3 August 2009Published online1 December 1956Published inissue 1 Decem…
Abstract The effect of chain branching on the dynamic mechanical properties of polyethylene within the temperature region 80 to 380°K. has been studied using an apparatus which drives rod‐like specimens in their transverse modes. The results for three types of polyethylene having 3.2, 1.6, and less than 0.1 branches p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of Sodium Metaborate from 5 to 350°K.George Grenier and Edgar F. Westrum Jr.Cite this: J. Am. Chem. Soc. 1956, 78, 24, 6226–6227Publication Date (Print):December 1, 1956Publication History Published online1 May 2002Published inis…
Abstract The gross dispersion of carbon black (or of other particulate fillers) in rubber can be measured quantitatively by cutting thin sections and examining them under the light microscope. The method is very suitable for control of mixing processes either in the factory or the compounding laboratory.
When graphite is bombarded in a nuclear reac tor ' there is a s teady deteriorat ion of the structure with product ion of interstit ial atoms, giving an increase of c dimension and decrease of a. Over a wide range of irradiation the parameter changes are linear wi th the dose. The amount of damage decreases wi th incr…
The effect of speed of evaporation, pressure, thickness, and age on the reflectance of evaporated Al films was investigated in the extreme ultraviolet from 900 A to 2200 A. High speed of evaporation was found to be the most important factor in producing Al films of highest ultraviolet reflectance. By changing the evap…
Abstract Long spacing order in the fiber axis direction is found for the majority of viscose rayon yarns, varying in repeat spacing from about 170 to 220 A. This order is interpreted as a regularity of crystallite placement such that the crystallites themselves act as diffracting centers to form a line lattice with lo…
Abstract The intensities of crystalline and amorphous infrared bands of 66 and 610 nylon films were plotted against density. The curves were extrapolated to zero intensity to give revised values for the amorphous and crystalline densities which are probably more accurate than those previously used. The amorphous densi…
Thermal‐expansion data from room temperature to 1500°C. are given for a number of ceramic materials. Determinations were made with telemicroscopes on bars or rods 7 in. long
The infrared absorption spectra of LaBO3, InBO3, and ScBO3 have been observed as crystalline powders in the wavelength range from 7 to 20 microns. The borates had a B10/B11 ratio varying from the natural abundance (18/82) up to about 96/4. The four fundamental frequencies for B10 fell within the ranges, ω1 = 939, ω2 =…
The fictive temperature formalism, in which the structural state of the glass is characterized by the fictive temperature T , is very useful in the qualitative description of the effects of thermal treatment in the transformation range. Experimental data are presented which show, however, that such a one‐parameter des…
The resistivity, thermoelectric power, and magnetic susceptibility of metallic solid solutions at room temperature are reviewed, and their relation with their electronic structure emphasized. The special properties of transitional impurities are related to the emptying of their d shells.
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