Materials Literature
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The electronic properties of a large number of icosahedral-crystal systems have been studied experimentally. These systems include alloys of the simple metals and those that contain transition metals. Some of the icosahedral phases (i-phases) are thermally stable while others are metastable; and their degree of struct…
Local-density-functional theory is used to evaluate the structure, vibrational bands and electronic properties of two point defects in diamond a pair of adjacent substitutional N atoms and a vacancy surrounded by four N atoms. These defects are important as they are possible models of the A and B centres seen in type…
Based on the defect chemistry of acceptor-doped strontium titanate model materials, the role of interfaces in conduction and voltage-induced failure mechanisms is discussed. The impedance behaviour of conventional ceramics and ceramic thin films is compared.
It is now widely accepted that intelligent problem solving requires access to a source of domain‐specific knowledge, and the existence of a control system to constrain the manner in which domain knowledge is searched. An example of a domain which has been intensively investigated is problem solving in physics. A numbe…
The microstructure and morphology of three samples of pyrolytic boron nitride deposited at different temperatures have been characterized with use of x-ray diffraction and thermal-conductivity measurements. The x-ray analysis allowed the determination of the mean interlayer spacing, the out-of-plane coherence length,…
Abstract The compressive‐stress strain response of polyurethane foam under uniaxial compressive impact loading has been studied. The development of a uniaxial constitutive model from strain rate controlled compression tests is detailed. Density and temperature functions have been added to the integral power model prop…
Magnesioferrite (MgFe204 spinel) was synthesized in equilibrium with excess MgO using a flux method. Chemical analysis shows that the MgFe204 is stoichiometric, within analytical uncertainty. Samples were annealed at intervals of 50 °C between 450 and 1250 °C and quenched in H20. The time needed to reach equilibrium a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics and photochemistry of quantized zinc oxide colloidsPrashant V. Kamat and Brian PatrickCite this: J. Phys. Chem. 1992, 96, 16, 6829–6834Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pub…
Glass-ceramics are microcrystalline solids produced by the controlled devitrification of glass. Glasses are melted, fabricated to shape, and then converted by heat treatment to a predominantly crystalline ceramic. The basis of controlled crystallization lies in efficient internal nucleation ( 1), which allows developm…
A scale-invariant theory of Raman scattering of light by fractal clusters is developed. The enhancement factor ${\mathit{G}}^{\mathrm{RS}}$ of Raman scattering is shown to scale in terms of a properly chosen spectral variable X. The critical indices of the enhancement factor are found to be determined by the optical s…
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of intermolecular hydrogen bonding for the induction of liquid crystallinity in the side chain of polysiloxanesUday Kumar, Takashi Kato, and Jean M. J. FrechetCite this: J. Am. Chem. Soc. 1992, 114, 17, 6630–6639Publication Date (Print):August 1, 1992Publication History…
Eleven series of dimeric liquid crystals, namely the α,ω-bis(4-n-alkylanilinebenzylidine-4′-oxy)alkanes, have been synthesized and their transitional properties characterized. The number of methylene groups in the flexible core was varied from one to twelve while the length of the terminal alkyl chains was increased f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of carbon nanofibersM. Endo and H. W. KrotoCite this: J. Phys. Chem. 1992, 96, 17, 6941–6944Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://doi.org/10.1021/j100196a017Request reuse permissi…
The corrosion inhibition characteristics of the quadridentate macrocycle 1, 4, 8, 11 tetra‐azacyclotetradecane (cyclam) on steel in sulfuric acid media are investigated at 25, 35, 45, and 55°C, and the thermodynamic energy parameters calculated. In addition the inhibition characteristics of the open‐chain polydentate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrimary and secondary oxygen-induced C1s binding energy shifts in x-ray photoelectron spectroscopy of polymersDavid. Briggs and Graham. BeamsonCite this: Anal. Chem. 1992, 64, 15, 1729–1736Publication Date (Print):August 1, 1992Publication History Published online1 May 2002P…
The interaction of sound waves with tunneling, relaxational, and resonant vibrational states in glasses is investigated within the soft-potential model. The same bilinear coupling constant is assumed for all three different kinds of soft modes. The model reproduces the results of the tunneling model at low temperature…
The ITS system is a powerful and user-friendly software package permitting state-of-the-art Monte Carlo solution of linear time-independent coupled electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Version 3.0 is a ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArylsilsesquioxane gels and related materials. New hybrids of organic and inorganic networksK. J. Shea, D. A. Loy, and O. WebsterCite this: J. Am. Chem. Soc. 1992, 114, 17, 6700–6710Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publishe…
The Judd-Ofelt intensity parameters, ${\mathrm{\ensuremath{\Omega}}}_{\mathit{t}}$ (t=2,4,6) for f-f transitions of ${\mathrm{Er}}^{3+}$ ions doped in ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$-${\mathit{R}}_{2}$O (R=Na,K) glasses were determined from optical-absorption measurements, and their compositional dependence was i…