Materials Literature
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Abstract Deformation processes in polymers are reviewed within the framework of rubber elasticity theory. The effect of hindered rotation on imposed and spontaneous length changes of polymeric fibers is discussed, leading to a new definition of crystallinity as a localized region of hindered rotation. This concept, to…
A hard-sphere model analogue of undirectional crystal growth has been devised and used to measure quantitatively the rates of growth normal to (111) and (100) planes in a face-centred cubic crystal structure. It has been found that 〈111〉 growth is much faster than 〈100〉 growth, and the result is interpreted in terms o…
Methods have been developed for growing thin polycrystalline films, and oriented polycrystalline films. Experiments with the thin films allow measurement of the absorption spectra of the N-salicylideneanilines well into the ultraviolet, and thus permit comparison of the effects of temperature change on the “thermochro…
Abstract Calculations of characteristic energy losses of electrons in thin dielectric foils are given for a) electrons with inclined incidence to the foil, b) electrons travelling parallel to the foil surface. Retardation is taken into account for case b) in the limit of very thick foils. For the special case in which…
The kinetics of the formation of zinc ferrite from zinc oxide and iron(III) oxide powders have been studied. Below about 1000°C Jander's equation is obeyed. Vaporization of the more mobile reactant (ZnO) occurs to form a coating on the particles of the other reactant with subsequent diffusion into it. An activation fr…
The isolation of complexes of stoicheiometry [Fe2B4O]X2Y2·xH2O (where B = 1,10-phenanthroline, X = Y = Cl, ClO4, NO3, or ½SO4, or X = Cl, Y = ClO4, or B = bipyridyl, X = Cl, Y = ClO4) is reported. For the chloride complex co-ordination of chlorine to iron appears to occur. The magnetic properties of the complexes over…
Abstract This study delineates the complex morphological‐deformation processes that occur during the spinning, fabrication, and testing of a series of drawn yarns as an integrated picture of mass movement on all morphological levels. The study involved the use of nine different experimental techniques, including small…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of metal cyanide coordination. VI. Copper(I)- and silver(I)-cyanide systemsReed M. Izatt, Harlin Dee Johnston, Gerald D. Watt, and James J. ChristensenCite this: Inorg. Chem. 1967, 6, 1, 132–135Publication Date (Print):January 1, 1967Publication History Publis…
Passive films of γ ‐ Al 2 O 3 formed on aluminum by chromate solutions exhibit lower ionic resistance and higher electronic resistance than amorphous thermal films of the same thickness. The low ionic resistance is attributed to the formation of some crystalline γ ‐ Al 2 O 3 of very low ionic resistance at the oxide s…
Abstract A comparison is made of the properties of magnesium oxides prepared from basic magnesium carbonates and Indian and Greek rock magnesites. the density increased with burning temperature and the reactivity decreased. the effect of this on the properties of oxychloride cements is shown. Iodine number is shown to…
The effect of a hydrated oxide on the kinetics of anodic oxidation of aluminum has been studied and the properties of the resulting composite oxides compared with those of purely anodic oxides. The presence of a hydrate layer reduced the amount of anodic oxide needed to support a given voltage and increased the curren…
An absolute precision determination of lattice constants by electron diffraction is made with thin monocrystalline films of germanium and aluminium, having a thickness between 1000 and 5000 A. The films are prepared from the bulk material by mechanical polishing and subsequent chemical polishing or etching. The obtain…
Abstract Studies of single‐crystal deformation explain the small‐ and wide‐angle x‐ray observations of the cold drawing of PE, particularly the effects in the necking zone where the original spherulitic structure is transformed into a highly aligned fiber structure. Whole blocks of folded chains are broken out of the…
Solid solutions of BiFeO3 and PbZrO3 were investigated for crystallographic and dielectric properties. A new pseudocubic perovskite phase was found, which has been tentatively indexed as orthorhombic with the same unit cell as PbZrO3 but with dielectric properties characteristic of a ferroelectric substance. The Curie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy, heat capacity, and heat of fusion of aluminum from 366.degree. to 1647.degree.KRichard Addison McDonaldCite this: J. Chem. Eng. Data 1967, 12, 1, 115–118Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 Januar…
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Solid‐state electrochemical cells have been devised using a variety of metals as anodes and electronically conducting charge‐transfer complexes as cathodes. The product of the electrochemical reaction, the electrolyte, was formed in situ . Data are reported for halogen complexes as well as for complexes containing nit…
Abstract The droplet technique was utilized to obtain estimates of the isothermal rate of homogeneous crystal nucleation in highly supercooled melts of unfractionated linear polyethylene. In a typical experiment a cell containing a suspension of several hundred micron‐size spherical droplets of the polymer was placed…
Abstract Electron microscopy techniques are used to study the domain structure and the mechanism of deformation of the ordered CuAu alloy. Investigations are made into the factors impeding the passage of dislocations across the boundary between domains with differently orientated c ‐axes. Experiments indicate that the…
Abstract The structure and properties of boron nitride fibers were examined. The fibers are polycrystalline consisting of a major phase of turbostratic boron nitride and a three‐dimensional ordered phase which is not hexagonal. The density of the fibers is determined by the amount of internal microporosity and crystal…