Materials Literature
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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…
Neutron quasi-elastic and elastic scattering experiments from NH 4 I are reported in the temperature range 213K-300K. It is shown that both while cooling and heating, one obtains an NaCl phase coexisting with low-temperature phases. This calls for great care in interpreting any data on NH 4 I in this temperature range…
Published drift mobility measurements on amorphous PVK, TNF, TNF:PVK mixtures and dispersions of TNF in polyester strongly suggest that transport is by small-polaron hopping controlled by charged traps. The existence of a characteristic temperature at which the extrapolated mobility loses its field dependence is ascri…
Electron band structure calculations reveal that ZrSe 3 is a semiconductor with E g approximately 1.5 eV whereas NbSe 3 and TaSe 3 are both highly anisotropic metals. The Peierls transition in NbSe 3 is related to the presence of four quasi-one-dimensional free-electron-like bands crossing the Fermi energy. This featu…
Neutron diffraction experiments have been carried out at room temperature and 4.2K on polycrystalline samples of Fe z O with z=0.943, 0.938 and 0.929. At room temperature, the ratio of octahedral iron vacancies to tetrahedral iron interstitials is close to 3 and is therefore in agreement with the defect cluster propos…
Although the role of anions such as nitrate, chloride, and sulfate in inhibiting the crystallization of aluminum hydroxide in soils and geological deposits is generally accepted, the dramatic effect of the carbonate ion in maintaining aluminum hydroxide gel in the amorphous form has been overlooked by most earth scien…
Sharp luminescence lines from indirect-free-exciton decay are observed in selenium. These permit for the first time an unambiguous identification of the indirect gap. A unique feature of the band structure and symmetry is the existence of two almost degenerate types of excitons with different wave vectors, leading to…
Neutron scattering gives information on molecular conformations in solid solutions of polymers of one isotope in another. Results on crystals of polyethylene grown from solution show a molecular dimension (in the form of a radius of gyration) that is almost invariant with the length of the chain. It is proposed that c…
Experimental results on the deformation of silicon crystals reported in a foregoing paper are discussed on the basis of a model and a hypothesis so far proposed. The dependence of the upper and the lower yield stresses on the temperature and the strain-rate can be described reasonably well by the model of Haasen et al…
The infrared reflectivity minimum in the transverse-longitudinal band gap of the ${\ensuremath{\nu}}_{3}({E}_{u})$ mode of NaN${\mathrm{O}}_{3}$ cannot be described by the usual damped-harmonic-oscillator model of the dielectric constant if only one resonance is assumed. A comparison of the single-crystal infrared ref…
Abstract Cotton fabric was subjected to thermal treatment for durations ranging from 0.5 to 5 min at a temperature range of 160°C. In comparison with the untreated cotton, the copper number (measure of the aldehyde content) decreased after heating cotton for up to 3 min at 160°, 180°, and 190°C but increased when heat…