Materials Literature
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The reaction between nitrogen gas and the series of R2Fe17 intermetallic compounds is studied by thermopiezic analysis on micron-size powders. Nitrogen diffusion in the range 300–550 °C can be represented by an activated interstitial diffusion process D=D0e−Em/kT with D0=1.95×10−10 m2 s−1 and an activation energy Em=0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conductive polyaniline-poly(vinyl alcohol) composite films: physical properties and morphological structuresShow An Chen and Woei Guwn FangCite this: Macromolecules 1991, 24, 6, 1242–1248Publication Date (Print):March 1, 1991Publication History Published online1…
Fluorescence and site-selective excitation spectra of chromium-activated forsterite at 10 K are reported. It is found that a high-field ${\mathrm{Cr}}^{3+}$ site in inversion symmetry emits sharp ${\mathit{R}}_{1}$ line fluorescence, while a low field ${\mathrm{Cr}}^{3+}$ site in mirror symmetry produces $^{4}$${\math…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical properties and force field parameters for polyethylene crystalNaoki Karasawa, Siddharth Dasgupta, and William A. Goddard IIICite this: J. Phys. Chem. 1991, 95, 6, 2260–2272Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the conformational behavior of an ABC triblock copolymer moleculeY. S. Sdranis and M. K. KosmasCite this: Macromolecules 1991, 24, 6, 1341–1351Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://pubs.ac…
The bulk magnetic properties of sintered materials are treated as those of a standard magnetic material with a permeability dependent on the porosity. If J/sub c/ is expressed as a function of the internal H instead of the applied field, it is much more constant. The flux profile technique can then be used to extract…
The AgI thermal transition of the \ensuremath{\beta} phase (wurtzite structure) to the \ensuremath{\alpha} phase (body-centered-cubic structure) occurred at a higher temperature (162 \ifmmode^\circ\else\textdegree\fi{}C) than that previously reported (\ensuremath{\sim}147 \ifmmode^\circ\else\textdegree\fi{}C). It is b…
The synthesis (up to the 10‐g scale) and purification of alkyl‐ and methoxyalkyl‐substituted [1.1.1]propellanes are described.
The core loss for a magnetic material under excitation can be estimated from the flux density versus the field-strength loops or B-H loops. A method is presented for predicting the position, size, and number of minor loops formed in the B-H loop, while harmonics of known magnitude and phase angle occur along with the…
Abstract Diamond‐like carbon films have been deposited from ternary mixtures of butadiene, hydrogen and argon in a parallel plate plasma reactor at constant pressure and power. These films have been etched in O 2 and CF 4 /O 2 plasma discharges. A new linear relationship between the composition of the deposition gas m…
Abstract A number of different techniques were applied to measure carbon-black-surface reactivity and the level of black-polymer interaction in four different elastomer systems (SBR, IIR, NR, and NBR) representing differences in unsaturation, crystallinity and polarity. Known within-grade surface activity variations w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer blends and polymer solutions: a Born-Green-Yvon integral equation treatmentJ. E. G. LipsonCite this: Macromolecules 1991, 24, 6, 1334–1340Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://pubs.ac…
Berreman’s 4 × 4 matrix method is used to study the optical properties of special configurations. Under certain conditions the expression for the characteristic matrix of a homogeneous anisotropic slab can be greatly simplified. If these conditions are also fulfilled for each slab of a multilayered system, relations b…
Thin vanadium oxide films were made by vacuum evaporation followed by the annealing posttreatment in the presence of air. The thickness increased by a factor as large as approximately 2.3 on oxidation. Electron diffractograms indicated a bcc ? monoclinic transformation during the annealing, and electron micrographs sh…
Constitutive equations are developed for nonlinear (and linear) nonlocal electromagnetic elastic solids that possess continuous memory of past fields. The consequence of the second law of thermodynamics is studied. Phenomenological laws are given for special cases of nonlinear optics, nonlinear magnetism, conduction,…
SOLEF1 polyvinylidene fluoride (PVDF or PVF2). characterized by a high crystallinity, possesses certain basic properties shared by all the varieties of PVDF: chemical inertness, thermal stability, good electrical porperties UV and γ radiation stability and non-toxicity.It is distinguished by excellent resistance to he…
Microstructural changes associated with the diffusionless cubic‐to‐tetragonal phase transition ( c–t ′) in sintered ZrO 2 –Y 2 O 3 ceramics with 4 to 20 mol% Y 2 O 3 are investigated. Ceramics containing 4 to 7 mol% Y 2 O 3 that are quickly cooled from high temperatures experience cubic‐to‐tetragonal transformation by…
The temperature dependence of hardness and microcracking in single‐crystal 9.5‐mol%‐Y 2 O 3 ‐fully‐stabilized cubic‐ZrO 2 was studied as a function of orientation. Crack lengths increased with increased temperature up to 500°C; above 800°C, no cracks were found, indicating an indentation brittle‐to‐ductile transition…
ABSTRACT Blanched samples of frozen vegetable soybeans using peroxidase (POD) and lipoxygenase (LIP) as blanching indices were compared with unblanched samples during storage by sensory evaluation, vitamin C determination and remaining enzyme activity. Samples using LIP and POD as blanching indices showed no significa…
We review studies of the effects of electronic excitation in α-Al2O3 crystals, paying special attention to the problem of the existence of self-trapped excitons and self-trapped holes in the material. After a brief review on the crystallographic and electronic structures, information on thermal and radiation-induced d…