Materials Literature
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During the creep of magnesium, cavities form on some grain boundaries, limiting the ductility of the material and causing its density to decrease. It is shown that cavitation is eliminated if a hydrostatic pressure is superimposed which is equal to the creep stress. If the hydrostatic pressure is applied after cavitie…
Evaporated films may have different thermal expansion coefficients from their substrates. When the temperature of such a combination is changed, thermal strains are introduced into the film. Calculations of the thermal strains and strain energies for the differently oriented grains in a polycrystalline sample were mad…
A method was developed for preparing ultra‐ high‐purity submicron powders of refractory oxides from transition metal alkoxides. Compounds of the type M(OR) 3 and M(OR) 4 , where R is an alkyl group such as C 4 H 9 ‐, were thermally decomposed to oxides at 325° to 450°C at atmospheric pressure. Techniques were perfecte…
Abstract A sample of polyisoprene having a narrow molecular weight distribution has been degraded mechanically in several ways and molecular weight distributions of the degradation products have been determined. From these data we conclude that chain scission occurs at a point far removed from the ends, but not necess…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Polymorphic Modifications of PhthalocyaninesJacques M. AssourCite this: J. Phys. Chem. 1965, 69, 7, 2295–2299Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/10.1021/j100891a026htt…
The principal thermomagnetic effects in semiconductors and semimetals are discussed, with emphasis on the physical processes which affect the transport coefficients. The Seebeck, Nernst, Righi-Leduc, Peltier, Ettingshausen and magnetothermal resistance coefficients are defined and the Kelvin-Onsager relations between…
A method is described for measuring the pyroelectric coefficient, dc dielectric constant, and volume resistivity of a polar material over a broad temperature range. The technique is based on the observation of the capacitive charging of a pyroelectric sample by the pyroelectric current generated during a continuous te…
The determination of stacking-fault energy from the dimensions of stacking-fault tetrahedra is critically examined and the results compared with those obtained by other methods. It is concluded that the dimensions of stacking-fault tetrahedra do not provide a reliable measure of stacking-fault energy. New values of th…
\ Vh e n s u bcooled fro m the m elt to any tempera t ure between abou t 90 t o lJ 0 C, polybu te l1!'-l tra nsform s at a r eadily m eas ura ble rate to a cr ys talline phase de noted "form 2," wh ich is t yp ically sphe ruli t ic. The kinetics of this process have bee n m eas ured by op t ical and d ihtometric t ech…
Measurements have been made from 2 to 30 °K and 60 to 90 °K of the thermal expansion of iron, cobalt and nickel, which show that the Grüneisen parameter γ l for the lattice decreases slightly at low temperatures and that the electronic parameter γ e (calculated from the ratio of the electronic contributions to expansi…
Large grained long life push-pull fatigue specimens of 99-999% purity copper have been examined at 10% and 50% of the expected life. Carbon replicas of slip striations were examined, interference microscopy was used to measure the displacement across the striations and dislocation structure was examined by transmissio…
Two types of interstitial loops with Burgers vector b = a/2<111> and b = a<100>, respectively, have been observed experimentally in irradiated b.c.c. metals. The present paper discusses how these loops can form from a common loop nucleus consisting of a single platelet of interstitials on a {110} plane. Such a loop co…
Abstract The dynamics of melt spinning was analyzed by deriving a set of simultaneous partial differential equations. Equation of heat balance: Equation of force balance: Equation of material balance: In the above equations, the distance x from the spinneret and time τ are the independent variables; temperature t , lo…
A method has been developed for calculating characteristic fluorescence corrections in all cases involving K and L lines, based on the formula derived by Castaing for the case of one K line exciting another K line. A modification to the original formula is proposed, which takes into account more recent work on K line…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectra between 100 and 2500 Cm.-1 of Some Complex Metal Cyanates, Thiocyanates, and SelenocyanatesA. Sabatini and I. BertiniCite this: Inorg. Chem. 1965, 4, 7, 959–961Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published iniss…
Abstract Monomolecular layers of methyl methacrylate inserted between the lamellae of montmorillonite clay were polymerized. Finely divided complexes of poly(methyl methacrylate)–montmorillonite were suspended in boiling hydrocarbons and subjected to thermal degradation at 215°C. and above, under air and nitrogen, wit…
J. M. Ziman London: Cambridge University Press. 1964. Pp. 360. Price 45s. This book is essentially an account of the consequences of the lattice periodicity in solids. Much of the ground was well tilled in the author's treatise Electrons and Phonons (Oxford: The Clarendon Press, 1962) but, as a textbook, the new work…
Fabric and mineral analysis of soils , Fabric and mineral analysis of soils , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
A molecular-kinetic theory, which explains the temperature dependence of relaxation behavior in glass-forming liquids in terms of the temperature variation of the size of the cooperatively rearranging region, is presented. The size of this cooperatively rearranging region is shown to be determined by configuration res…
Abstract Copolymerization of phenyl isocyanate with ethylene oxide was investigated under several conditions. The polymers obtained with AlEt 3 alone or the AlEt 3 ‐H 2 O system as catalyst were found to be composed of two types, that is polyethylene oxide and alternate copolymer of phenyl isocyanate with ethylene oxi…