Materials Literature
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Optical absorption and photoconductivity have been observed in the ultraviolet in single crystals of nominally pure $\ensuremath{\beta}\ensuremath{-}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$. At room temperature a steep absorption edge, characteristic of a band-to-band transition, is observed at 2700 \AA{}. The edge is shift…
Experience with stainless-steel-clad fuel rods irradiated in the Vallecitos Boiling Water Reactor (VBWR) has shown that Type-304 stainless steel is susceptible to stress-assisted intergranular corrosion attack. Failure of over 40 fuel rods clad with this material occurred during irradiation of 950 fuel rods of several…
The relation between the grain size, the density and the sintering conditions for polycrystalline nickel ferrite has been studied for specimens prepared by a conventional ceramic technique. The contribution to the ferrimagnetic resonance linewidth due to the pores within the ferrite is considered and it is shown that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Formation and Polymerization of Carbon SuboxideB. D. Kybett, G. K. Johnson, C. K. Barker, and J. L. MargraveCite this: J. Phys. Chem. 1965, 69, 10, 3603–3606Publication Date (Print):October 1, 1965Publication History Published online1 May 2002Published inissue 1…
Abstract The effect of various environmental conditions, other than chemical, on the mechanical properties of amorphous polymers is considered. The response of such polymers to an applied stress or strain depends on the mobility of polymeric chains which in turn is largely a function of free volume. The free volume va…
In current technology, the edge definition that can be achieved by the photoresist process is approximately ten times sharper than the registration accuracy that can be maintained over a workpiece of any reasonable size. A description is presented of an attempt to improve registration through feedback from the workpie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor-Liquid Equilibria of the System Acrylonitrile-Acetonitrile-Water.D. S. Blackford and Robert YorkCite this: J. Chem. Eng. Data 1965, 10, 4, 313–318Publication Date (Print):October 1, 1965Publication History Published online1 May 2002Published inissue 1 October 1965https…
Stress relaxation in rubber stocks containing various fillers was measured at room temperature, and an empirical equation found for relating decrease in tension, ft, over a period of time from 0.1 sec. to 6 months, namely: where f1.0 is force after 1 min. of relaxation, n is the relaxation rate of material (by definit…
Uniaxial tensile data from tests at different rates of extension over a wide temperature range are considered for butyl, silicone, Viton B, SBR, and natural rubber vulcanizates (series A) and for six Viton A-HV vulcanizates (series B) of differing crosslink densities. For series A and for A-6 in series B, equilibrium…
Measurements of the thermal conductivity of plastically deformed CaF2 and LiF between 1.3° and 80°K indicate the presence of a phonon scattering mechanism which does not display the frequency dependence normally associated with dislocations. Instead of a reciprocal relaxation time τ−1∝ω, which is characteristic of sca…
It is generally assumed, that in solids the diffusion of gas is modified through traps, which capture the gas atoms for a certain length of time. Taking into account this trapping with constant absorption- and emission-probability the diffusion from a sphere was calculated numerically by HURST. In the present paper th…
The theory of the thermal scattering of high energy electrons propagating through crystals is derived starting from the scattering by individual atoms, the electron before scattering being represented by a Bloch wave. The equivalence of this method with the usual quantum mechanical approach is established. Comparison…
It has been found that the current-field characteristic of silver sulphide is non-linear and that switching can occur between a high-resistance and a low-resistance state. It is shown that this behaviour is consistent with the rapid rise of electrical conductivity with temperature in the β-phase and a discontinuous in…
This study is concerned with the establishment of structural properties common to all borides and modifications of boron which contain B 12 polyhedral units. It has been found that all unit-cell dimensions in these structures can be derived from simple arrangements of B 12 units which can be regarded as large metallic…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The deformation of glassy polystyrene under a fixed tensile dead load can take place in three different modes: (a) drawing by formation and propagation of a neck, (b) drawing by proliferation of deformation bands without necking, and (c) homogeneous creep. Which mode is observed depends primarily on stress level and t…
A comparison between infrared absorption and neutron inelastic-scattering measurements indicates the existence of a broad low-energy (around 400 cm−1) protonic level in KH2PO4 above the Curie point. This level is only weakly discerned in the ir but is seen quite clearly in neutron scattering. The mode is explained as…
Abstract Heat capacities have been measured for strontium and lead dicalcium propionates from 15 to 300°K with an adiabatic-type calorimeter in connection with the ferroelectric phase transition of strontium salt. The heat capacities, enthalpies, entropies and Gibbs energy functions in the standard state have been det…
The Laplace transform technique has been used to develop asymptotic solutions to the integral equations describing the radiation damage displacement cascade, for scattering laws whose symmetrical parts are functions of the relative transferred energy alone. The solutions are presented explicitly for the truncated Coul…
Polypropylene aggregates, consisting of interwoven arrays of single-crystal lamellae, have been obtained by crystallization of samples of isotactic polypropylene from dilute solutions held at constant temperatures between 85° and 115°C. The solvent used was α-chloronaphthalene with polymer concentrations ranging from…