Materials Literature
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Specific helium-tungsten defect configurations suggested by Kornelsen to result from ion implantation following irradiation have been calculated. The calculations are atomistic in nature; those interatomic potentials involving the rare gases were determined from fist principles. The divacancy is found to be most stabl…
A method is described for determining the Curie constant (Cc) of ferroelectric crystals below the Curie temperature (Tc) from the pyioelectric response. It is shown from Devonshire's phenomenological theory of ferroelectricity that the material parameter (p/ϵ) of the pyroelectric response is given by p/ϵ =PS/Cc , wher…
The present state of our knowledge of the properties of high purity germanium is reviewed. The role of excess vacancies, oxygen and high dislocation density in producing trapping in detectors is discussed. By the application of Fourier Transform Spectroscopy, the major impurities have been identified and aluminum has…
The 4″-n-alkyl-4-cyano-p-terphenyls permit the formulation of colourless, stable, wide range nematic mixtures of simple eutectic compositions, valuable for electro-optic displays, and the readily prepared 4″-bromo-4-n-heptanoyl-p-terphenyl provides a rare example of a direct smectic B to nematic transition.
Calculations of the contributions of quadrupole–quadrupole interactions to the intermolecular potentials of the molecular pairs benzene–benzene, hexafluorobenzene–hexafluorobenzene, and benzene–hexafluorobenzene have shown that, in complete agreement with X-ray structural data, the preferred orientation in the two pur…
Relationships developed earlier (1) for the dependence of the rate of appearance and propagation of dendrites on the properties of the system and overpotential, have been used to develop a quantitative theory of induction period and critical overpotential of dendritic growth. It has been shown that the thermodynamic c…
The dynamic mechanical response of a styrene/butadiene/styrene (SBS) block copolymer with segment molecular weights of 16,000/78,000/16,000 (designated as Shell 16/78/16) was determined at various temperatures between -83 and +86°C at frequencies between 0.1 and 1000 Hz. The data were shifted into a master curve accor…
Les noyaux et les fils ont été décrits dans les cristaux liquides nématiques et cholestétériques relativement peu torsadés, au voisinage de la transition isotrope (du MBBA pur ou additionné d'un faible pourcentage de substance active : le benzoate de cholestérol conduisant à une torsion gauche et le baume de Canada pr…
The equilibrium oxygen pressures for Cr‐Ni alloys existing as the alpha (α) and gamma (γ) phases and coexisting with chromium oxide , nickel oxide , and nickel chromite were determined at 900°, 1000°, and 1100°C using an electrochemical cell with a calcia‐zirconia electrolyte. These pressures were related to compositi…
A molecular dynamics computation of S(q, w) has been performed on a linear chain of harmonically coupled double wells. For order-disorder systems, a broad central peak and a low frequency peak appears on top of the usual bottom of the well frequency of every q. For displacive systems an intense central peak distinct f…
A new ordered structure of Au5Sn is determined by X-ray and electron diffraction using single crystals. The unit cell of the hexagonal superstructure contains 15 Au and 3 Sn atoms, having the lattice constants a=\sqrt3 a0 and c=3 c0, where a0∼2.94 Å and c0∼4.78 Å are those of the fundamental hcp cell. The closest inte…
Metallic foreign atoms introduced into the surface layers of aluminum specimens are shown to be mobile during anodic oxidation. The direction of motion depends on whether the initial distribution of the foreign atoms is located in aluminum metal under the natural air‐formed oxide or entirely contained within a thin pr…
films have been prepared by reactive sputtering in an oxygen‐containing glow discharge, by ion‐beam sputtering in an accelerator, and by anodizing with an ethylene‐glycol‐based electrolyte. The sputtered films were amorphous if deposited on or Ta at temperatures from −100° to +200°C, though were crystalline if deposit…
This review gives a survey of the results Of five years† of study in the field of electron fractography conducted at the National Aerospace Laboratory (N.L.R.) to sleek a better understanding of fracture mechanisms. It is largely based on a series of publications l-12 that appeared during these years. In general only…
Hydrogen embrittlement is classified into three types: internal reversible hydrogen embrittlement, hydrogen reaction embrittlement, and hydrogen environment embrittlement. Characteristics of and materials embrittled by these types of hydrogen embrittlement are discussed. Hydrogen environment embrittlement is reviewed…
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Computerized analysis of composite structures formed by the adhesive bonding of materials is presented. The adhesive is considered to be a part of a linearly elastic system whose components are individually characterized by two bulk property elastic constants. Solution is obtained by finite difference minimization of…
The formation of droplets from cylindrical oil films supported by oleophilic filaments has been studied experimentally. In the absence of surfactant, the initial rate of growth of a disturbance on the cylindrical fluid surface was shown to depend on the interfacial tension, the film thickness, cylinder radius and liqu…
Description The symposium on Erosion, Wear, and Interfaces with Corrosion was presented at the Seventy-sixth Annual Meeting of the American Society for Testing and Materials held in Philadelphia, Pa., 24-29 June 1973. Committee G02 on Erosion and Wear sponsored the symposium. A. Thiruvengadam, The Catholic University…
Magnetic circular dichroism (m.c.d.) spectroscopy has been used to measure the angular momentum of the lowest excited state of the phthalocyanine ring as a function both of the central metal ion and of the axial ligands bound to the metal. The magnetic moments have been extracted from experiment using a moments analys…