Materials Literature
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ABSTRACT Available records indicate that the formation of glauconite requires marine water near normal salinity, reducing conditions, and appropriate source materials. It is favored by high organic content of the bottom sediments in which it forms, and by slow or negative sedimentation. It may form under a fairly wide…
Experimental measurements of the kinetics of thermal decomposition of ammonium nitrate have been made in the temperature range from 443 to 553°K. The results indicate that the degradation of ammonium nitrate is an autocatalytic liquid-phase reaction, the rate of which is proportional to the product of the mass of salt…
The splitting of the methylene deformation frequencies in crystals of n-paraffins is described in terms of interaction between nearest-neighbor molecules On the basis of a simplified model, the order of magnitude of the splitting may be accounted for Polarization behavior and changes occurring upon heating, cooling, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Equilibria in the System K2CO3-Nb2O5 by the Method of Differential Thermal AnalysisArnold Reisman and Frederic HoltzbergCite this: J. Am. Chem. Soc. 1955, 77, 8, 2115–2119Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Resolution and Racemization of Potassium Ethylenediaminetetra-acetatocobaltate(III)F. P. Dwyer, E. C. Gyarfas, and D. P. MellorCite this: J. Phys. Chem. 1955, 59, 4, 296–297Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability of Iron(III)-Phenol Complexes1Ronald M. MilburnCite this: J. Am. Chem. Soc. 1955, 77, 8, 2064–2067Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ja01613a009https…
In a nuclear reactor, quartz alters gradually to an amorphous form. Some of the property changes observed are ( a ) decreases in density, refractive indices, rotatory power, and birefringence, ( b ) disappearance of the α‐β transition, and ( c ) changes in the absorption spectrum. The properties of vitreous silica als…
Abstract A previous analysis of the polymerization of liquid sulfur has been revised to take account of specific heat data now available and some new experimental evidence presented here. It is confirmed that liquid sulfur is essentially an equilibrium mixture of S 8 rings and long free radical chains. The heat of pol…
Abstract The viscosity slope constant k ′, i.e. , \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\lim }\limits_{c \to 0} \frac{{d\left( {{{\eta _{sp} } \mathord{\left/ {\vphantom {{\eta _{sp} } c}} \right. \kern-\nulldelimiterspace} c}} \right)}}{{dc}}\frac{1}{{[\eta ]^2 }} $\end{document} , is sho…
The absorption of high‐frequency (60 kc. to 20 me. per second) sound waves in fused silica shows a large peak at low temperatures (30° to 50°K.). This absorption appears to result from some property of the glassy state since the absorption does not occur in crystalline silica. Data are presented showing the variation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose and Cellulose Derivatives.Ward PigmanCite this: J. Am. Chem. Soc. 1955, 77, 8, 2349Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ja01613a114https://doi.org/10.1021/…
Las experiencias realizadas en Anchor Concrete Products, Inc., Buffalo, N.Y., y otras instalaciones construidas recientemente, ponen de manifiesto las ventajas de los autoclaves cilíndricos de gran diámetro.
Una nueva fábrica de piezas prefabricadas de hormigón dedica sus actividades a la preparación de tejas de hormigón, en el futuro alcanzará una producción diaria de 36.000. En este artículo se den las características de la instalación, proceso de fabricación y piezas fabricadas. Las ventajas son considerables.
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Como consecuencia del empleo; cada día creciente, de los azulejos en la construcción, se revisan continuamente los viejos métodos de producción de aquéllos. En este artículo se resumen las principales características de la producción de azulejos en una de las fábricas más modernas, de la Stylon Southern Corporation, e…
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The 5 elastic constants of hexagonal cobalt have been determined using pulse modulated ultrasonic waves which are reflected back and forth within the crystal. Frequencies between 10 and 30 Mc/sec were used. Values of the constants were derived from 11 measurements of wave velocities for longitudinal and shear modes in…
The system BaTiO 3 –CaTiO 3 was investigated from room temperature to 1900°C. by several different techniques. The system is characterized by extensive solid solution with a minimum at 18 wt.% CaTiO 3 . The extent of solid solution decreases rapidly with temperature from a maximum of approximately 30 wt.% in each end…
Abstract The molecular characteristics which determine the melting points of high polymer crystals are considered, and it is shown that the properties of monomeric crystals often throw light on those of the polymers. The principal factors controlling melting points appear to be molar cohesion energy (of the whole mole…
A theoretical analysis of the cubic to orthorhombic transformation is presented which predicts for a partly transformed crystal, the interface plane, orientation relationships, and macroscopic distortions from a knowledge only of the lattice parameters of the initial and final phases. Arguments are advanced to show th…