Materials Literature
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Abstract Several montniorillonites and a nontronite were digested in hydrochloric acid at constant temperature for various periods of time. Soluble iron, aluminum, magnesium, and in two samples titanium, were determined for each digestion period. Rate of solution curves were obtained by plotting the logarithm of the p…
Experiments suggest that dislocations in germanium act as rows of closely spaced acceptor centres. In n-type material a dislocation accepts electrons and becomes a line of negative charge surrounded by a cylindrical region of fixed positive space charge. An array of parallel dislocations will have relatively little ef…
Data on some of the physical properties of plutonium metal are given, including allotropic modifications, crystal structures, transformation temperatures, melting point, densities, expansion coefficients, electrical resistance, and magnetic susceptibility.
The paramagnetic resonance absorptions in several trichelate complexes of Cr+3 have been investigated at room temperature and at 1.2- and 3.0-cm wavelengths. From single crystal measurements on chromic acetylacetonate the orientations of the electric axes were determined and the parameters in the spin-Hamiltonian foun…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. E. Farnsworth, R. E. Schlier, T. H. George, R. M. Burger; Ion Bombardment‐Cleaning of Germaniu…
Following an earlier paper based on the Morse potential, the analysis of the thermal properties of a linear chain is now extended to cover an interatomic potential of arbitrary form. The Lennard-Jones potential is taken as an example and the results for the thermal expansion coefficient are compared with experimental…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Crystallization in High Polymers: Natural Rubber1,2Donald E. Roberts and Leo MandelkernCite this: J. Am. Chem. Soc. 1955, 77, 3, 781–786Publication Date (Print):February 1, 1955Publication History Published online1 May 2002Published inissue 1 February 1955h…
Abstract The hydrated Mg-vermiculite lattice contains double sheets of water molecules interleaved with silicate layers. In the fully hydrated condition, each water sheet is arranged in a regular hexagonal pattern and the interlayer cations are located midway between water sheets in octahedral coordination. Release of…
Data are presented on the changes in the room‐temperature refractive index and density of a borosilicate crown glass produced by different heat‐treatments. Measurements on a large number of samples with widely varying thermal history show that the refractive index is a single‐valued function of the density. The increa…
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Las piezas aligeradas presentan una serie de propiedades: densidad, aislamiento térmico, etc. Que determina siempre, siempre que no se precisen, simultáneamente, grandes resistencias. Su preparación, tal como se indica en este artículo, carece de dificultades.
En un secadero túnel, con aire introducido por presión y con circulación cíclica, se consiguen las mayores ventajas prácticas. Se reduce el peligro de la condensación de humedad, evitándose, por consiguiente, el reblandecimiento de los ladrillos y la formación de grietas durante el secado.
Se discute, en este artículo, la construcción de un secadero, unido directamente a un horno túnel, sin puertas intermedias. Se presta atención al problema de la recuperación de calor y a la dificultad de controlar el flujo de gases desde el horno al secadero.
El tratamiento al autoclave ofrece interesantes oportunidades para la preparación de productos de hormigón, a partir de una gran variedad de materias primas.
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Abstract On the basis of simple assumptions, equations are derived for predicting the specific volume‐temperature‐molecular weight ( v ‐ T ‐ M ) relationships for a homologous series of polymers from the v ‐ T curves for the monomer and the polymer of infinite molecular weight. Analogous v ‐ T ‐ρ relationships (where…
Using the method of generating function, we have discussed the shape of the absorption band and the probability for non-radiative transition of a trapped electron in insulating or semiconducting crystal, especially their temperature dependence. We have thereby chosen a model for the vibrational motion of the lattice a…
Abstract A group-theoretical treatment of the spatial symmetry of two-dimensional graphite leads to a classification of the one-electron eigenstates. The method of idempotent operators is used to derive Bloch orbitals for the crystal valence bands as linear combinations of the atomic orbitals 2px, 2py and 2s. The func…
Abstract Isobars for the adsorption of O2, H2 and CO on evaporated films of Rh, Mo, W and Fe, of Ch and CO on Ta, Pt and Pd, and of O2 on Cu, Al and Zn have been obtained. On Rh, Mo and W the rapid adsorption of O2 and H2 at -183° C results in formation of monolayers with one atom per surface atom. On Ta, Pt, Pd, Cu,…