Materials Literature
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Abstract Quenched amorphous films of poly(ethylene terephthalate) (PET) are stretched at temperatures less than T g ; changes in density, wide‐angle x‐ray diffraction, and small‐angle light scattering are observed. The density increase upon stretching is attributed to an increase in crystallinity accompanied by an inc…
A beta titanium alloy was evaluated for use in orthodontic appliances. Standard mechanical tests and aspecially designed spring test were used. Two particular thermo-mechanical treatments resulted in titanium springs with 1.8 times the extension of comparable stainless steel springs, and a 2.2 fold reduction in force…
Electrical conductivity specimens of and were prepared by a cast ceramic tape technique and by the more conventional method of isostatically pressing and sintering. The electrical conductivity of these specimens was measured in oxygen between 400°–1000°C. In this region the conduction is essentially ionic, and the tem…
The outstanding electrical and arc-quenching characteristics of sulphur-hexafluoride (SF6) have already set new trends and standards for the construction of high voltage equipment. Intensive research is being carried out on the electrical properties of SF6, other electronegative gases and their mixtures with more comm…
We have carried out a high-resolution x-ray study of the mass-density fluctuations and a light-scattering study of the bend-mode-director fluctuations associated with the nematic-smectic-$A$ phase transition in 4-cyano-4\ensuremath{'}-octylbiphenyl (8CB). This phase transition is found to be nearly second order with a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and evaluation of a new low-pressure impactor. 2Susanne V. Hering, Sheldon K. Friedlander, John J. Collins, and L. Willard RichardsCite this: Environ. Sci. Technol. 1979, 13, 2, 184–188Publication Date (Print):February 1, 1979Publication History Published online1 May…
An attempt is made to unify current knowledge of the optical, vibrational, transport and defect-related properties of amorphous As in terms of its structure and the nature of the bonding. The importance of remnant mesomeric bonding, particularly in determining preparation-dependent variations in the optical gap, is st…
General lattice vibrational properties of minerals, particularly those properties which strongly influence the thermodynamic behavior, are discussed in this paper (the second of a series relating thermodynamic and lattice vibrational properties of minerals). Infrared (IR), Raman (R), and inelastic neutron scattering (…
The results of an electron spin resonance (ESR) study of trans-polyacetylene, before and after doping with AsF5, are reported. The undoped polymer exhibits a Lorentzian line (g=2.00263) indicative of motional narrowing from a mobile unpaired electron species. Measurement of the intensity indicates a Curie law suscepti…
In the light of recent experimental studies on ion implantation in beryllium metal, some of the properties and interactions of implanted lithium, magnesium and zinc have been calculated using effective ion-ion potentials constructed by pseudopotential methods. It is shown that there is a strikingly small interaction e…
Molecular dynamics calculations have been performed on polymeric systems containing a single chain immersed in a solvent. All atoms interact via the repulsive (shifted) Lennard-Jones potential. In addition, nearest neighbors along chains are linked by a quasiharmonic potential which permits limited pair extensions. Ch…
Measurements of lattice parameters and birefringence of PbTiO3 single crystals are described as a function of temperature. The anomalous rise in birefringence with temperature is interpreted in terms of lattice strain and dielectric polarization.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous catalysis of the photoreduction of water by visible light. Mediation by a tris(2,2'-bipyridine)ruthenium(II)-cobalt(II) macrocycle systemGilbert M. Brown, Bruce S. Brunschwig, Carol Creutz, John F. Endicott, and Norman SutinCite this: J. Am. Chem. Soc. 1979, 101,…
The conditions under which shear bands occur in rolling have been examined from a macroscopic standpoint. It is found that the main features of the observed shear bands can be explained by macroscopic analysis without recourse to detailed crystallographic mechanisms. The bands form as the result of load instability ca…
The principles of lattice dynamics are briefly reviewed in this paper, and from these principles a simple, generally applicable lattice vibrational spectrum is proposed for minerals. The spectrum can be used to calculate the thermodynamic functions in the harmonic approximation. The model proposed is consistent with l…
The infrared spectrum of CO chemisorbed on alumina-supported Rh atoms has been investigated. In agreement with previous work, three types of adsorbed species have been clearly distinguished on the basis of their C–O stretching frequencies. Species I, assigned as Rh(CO)2, is formed only with Rh atoms which are isolated…
Cerium dioxide deviates strongly from stoichiometry at elevated temperatures and reduced partial pressures of oxygen to produce an oxygen deficient n‐type semiconductor. Measurements of electrical conductivity and thermoelectric power as a function of were performed on single crystals of over an extended composition r…
At present, over 30 000 powder diffraction patterns are available as references. It is proposed that the patterns on file as well as new patterns submitted for publication be assigned quantitative quality factors. A simple-to-use figure of merit, FN, covering both accuracy in the measurement of the positions of the di…
Abstract A compilation is presented of all published measurements of electron inelastic mean free path lengths in solids for energies in the range 0–10 000 eV above the Fermi level. For analysis, the materials are grouped under one of the headings: element, inorganic compound, organic compound and adsorbed gas, with t…
This paper is divided into three parts. The first part reviews several types of measurements which we have made on atmospheric corrosion. These are intended to provide a self-consistent set of data from which generalization can be made. Differences between atmospheric corrosion and dry oxidation become apparent. The d…