Materials Literature
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Abstract The infrared absorption spectra in the range from 200 to 700 cm −1 of cubic and tetragonal manganese ferrites, Mn x Fe 3– x O 4 , are reported. An analysis of the spectra is made with a model by which the lattice vibrations are classified into species of the point group D 2 d on the analogy of the results for…
The scaled particle theory of Reiss et al. has been extended to hard non-spherical particles and equations analogous to the Percus-Yevick equation have been obtained for mixtures of particles of the same shape but different sizes. The resulting equation of state produces exact second and third virial coefficients whic…
The inhibitive effect of medium‐sized polymethyleneimines on the corrosion of iron in HCl solution is particularly good, and this effective inhibition is closely related to the angle of C‐N‐C bond or to strain in the ring as has been observed previously. The inhibition mechanism of the cyclic imines is developed furth…
Abstract An important new class of polymers, the thermoplastic elastomers, was announced by the Shell Chemical Company (U.S.A.) in 1965. These new products may be formed into useful articles by modern rapid thermoplastics processing techniques, such as injection molding, and without any chemical vulcanization step pro…
Thermogravimetric Analysis (TGA) is finding increasing utility in investigations of the pyrolysis and combustion behavior of materials. Although a theoretical treatment of the TGA behavior of an idealized reaction is relatively straight-forward, major complications can be introduced when the reactions are complex, e.g…
Due to the spontaneous deformations of ferroelectric crystals in their ferroelectric phases, twins (domains) may be separated only by those composition planes (domain walls) which satisfy the mechanical compatibility conditions; such planes are in an infinite crystal called permissible walls. A mathematical treatment…
Measurements have been made of the growth rate of zinc dendrites in alkaline zincate solutions as a function of overpotential (η), concentration ( c ) , and temperature ( T ) . The tip radii have been measured by electron microscopy. At constant potential, an initiation time of between 5 and 100 min is observed, depen…
The field of fluid mechanics is rapidly advancing, driven by unprecedented volumes of data from experiments, field measurements, and large-scale simulations at multiple spatiotemporal scales. Machine learning (ML) offers a wealth of techniques to extract ...Read More
Contents: An engineering approach to textile structures. One-dimensional structures: yarn geometry. Form and fiber arrangement in twisted yarns (Hearle). Theory of the extension of continuous filament yarns. Observed extension and breakage of continuous filament yarns. Theory of the mechanics of staple fiber yarns. Ob…
Preface 1. Introduction 2. Point defects 3. Extended defects 4. The primary event 5. The collision cascade 6. Point defects in irradiated metals 7. Point defect clusters in irradiated metals 8. Impurity damage Bibliography Index.
Inhomogeneous broadening has been observed in resonance lines in solids over the wide range of energies spanned by nuclear magnetic resonance, electron spin resonance, optical, and M\"ossbauer methods. The broadening arises from random strains, electric fields, and other perturbations from the defects in the lattice c…
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation Leonid V. Azároff, Richard B. Zipin; Elements of X-ray Crystallography. Physics Today 1 January 1969; 22 (1): 99. https://doi.org/10.1063/1.3035379 Download citation file: Ris (Zotero) Reference Manager EasyB…
Two wear-out type failure modes involving aluminum metallization for semiconductor devices are described. Both modes involve mass transport by momentum exchange between conducting electrons and metal ions. The first failure mode is the formation of an electrically open circuit due to the condensation of vacancies in t…
Many of the polymers used in composite systems and in other applications are cross-linked or thermoset polymers. How do such cross-linked polymers differ in properties from the better-understood linear or thermoplastic polymers? This review paper attempts to answer this question. The paper is written from the practica…
The current state of polaron theory as applicable to transition metal oxides is reviewed, including problems such as impurity conduction where disorder plays a role. An estimate is given of the conditions under which polaron formation leads to an enhancement of the mass but no hopping energy. The binding energy of a p…
Abstract Polymere mit phthalocyaninrtiger Struktur ergaben sich durch Reaktion von einigen schwefelhaltigen Komplexen, die vier Nitrilgruppen enthalten, mit Kupferacetylacetonat bei höherer Temperature. Die Leitfähigkeiten der Polymeren liegen zwischem 6,3·10 −3 und 2,1·10 −10 Ohm −1 cm −1 . Die Aktivierungsenergie ze…
Ninety-one samples of diatomaceous rocks collected from seven separate sections of the Miocene and Pliocene strata of Oga Peninsula. Akita Prefecture, were studied. The samples are from, in ascending order, the upper part of the Onnagawa Formation, the Funakawa Formation, the Kitaura Formation, the Wakimoto Formation…
Abstract The synthesis of N‐vinyluracil, N‐vinylthymine, and N‐vinyladenine is described. The general procedure consists of the conversion of the corresponding nucleric acid bases to their N‐hydroxyethyl compounds, followed by chlorination to the N‐chloroethyl compounds and dehydrochlorination to the N‐vinyl derivatie…
Examination of the organic matter in some modern and fossil oolites has shown that it contains protein, with a high content of acidic amino acids. Artificial oolites from a water-processing plant contained no amino acids. The protein matrix may influence the formation of natural oolites by concentrating calcium ions.
Resistivity and Hall-effect measurements in ${\mathrm{Eu}}_{0.95}$${\mathrm{Gd}}_{0.05}$S give evidence for the onset of a well defined conduction band with critical scattering coexisting with magnetic impurity states.