Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray study of (NH4)7[H2AsW18O60].16H2O: first example of a heteropolyanion containing protons and arsenic(III)Y. Jeannin and J. Martin-FrereCite this: Inorg. Chem. 1979, 18, 11, 3010–3014Publication Date (Print):November 1, 1979Publication History Published online1 May 2002…
Abstract Various approaches to representing the modulus of a semicrystalline polymer as a composite crystal‐amorphous material are applied to the extensive data of Illers on the shear modulus of linear and branched polyethylenes as a function of crystallinity and temperature. It is found that the modulus of linear pol…
The resistivity, Seebeck coefficient, superconducting transition temperature, and upper critical field have been measured in ${\mathrm{Cs}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ for $0.19<~x<~0.30$. In contrast to ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, no temperature-dependent anomalies were observed in either…
The Engell‐Stolica potentiostatic method has been used for the kinetic study of the mechanism of pitting initiation of Al 1199. A statistical treatment of the induction time has been developed in order to get meaningful data. Pitting initiation time has been found to be potential‐independent and the linear increase in…
Abstract A systematic understanding of the heat distortion temperature (HDT) of amorphous and semi‐crystalline polymers is possible through a direct correlation with the modulustemperature behavior. For amorphous polymers, the precipitous drop in modulus at the glass transition temperature makes the HDT a well‐defined…
Hydriding and dehydriding kinetics are derived within the framework of the Johnson-Mehl-Avrami equation. Hydriding is considered to be rate limited by hydrogen diffusion through a growing hydride layer, and dehydriding by hydrogen diffusion through a growing metal layer. Incubation time effects due to surface contamin…
The EPR spectra of ${\mathrm{Fe}}^{3+}$ in the three ferroelectric phases of BaTi${\mathrm{O}}_{3}$ could be interpreted on the basis of the Newman superposition model. In the latter, the position of the nearest (oxygen) ligands determines the EPR spectrum. It is found that the ${\mathrm{Fe}}^{3+}$ participates by les…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on strain energiesJames D. Dill, Arthur Greenberg, and Joel F. LiebmanCite this: J. Am. Chem. Soc. 1979, 101, 23, 6814–6826Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs…
We showed previously that fibril formation in vitro from rat tail tendon collagen requires a temperature-dependent initiation (Step 1) following which linear assembly to form thin filaments (Step 2) proceeds as rapidly at 4 degrees C as at 26 degrees C. Step 3, lateral assembly of filaments to form fibrils, is again t…
Abstract Several methods are reviewed for determining compositions in multiphase, reacting mixtures at equilibrium. Wolfe's quadratic programming algorithm is applied and results compared with the Rand method (Dluzniewski and Adler 1972), NASA method (Gordon and McBride 1971) and the George et al. (1976) implementatio…
BaTi${\mathrm{O}}_{3}$ ceramics doped with several iron-group elements up to 2.0 mole% were identically prepared and afterwards annealed at 700\ifmmode^\circ\else\textdegree\fi{}C in ${\mathrm{O}}_{2}$ at 150 bar or in ${\mathrm{H}}_{2}$-${\mathrm{H}}_{2}$O with an oxygen partial pressure of ${10}^{\ensuremath{-}22}$…
The hydriding and dehydriding kinetics of Mg were measured by a method which sweeps through the pressure and reacted-fraction variables. However, a new data-analysis method is employed which permits the derivation of the kinetics at constant pressure, in which form they are much more amenable to interpretation. The eu…
Models based on energy and stress considerations are applied to the phenomenon of spontaneous fracture of materials due to phase transformations and thermal expansion anisotropy. Results are shown to be in reasonable agreement with observations of the grain‐size dependence of such cracking and the effects of internal…
Amorphous films with the compositions MgSiO3 and Mg2SiO4 were condensed by reactively sputtering cathodes with the compositions MgSi and Mg2Si in argon-oxygen atmospheres. Optical constants for these films in the 7-33 micron region were derived by fitting the transmission curves with harmonic oscillators (classical di…
The influence of the structure of activators on the anionic polymerisation of lactams is examined and a classification of activators taking into account the chemical nature of the active centres formed and the side products is proposed. An approach to the specific selection of activating compounds for the regulation o…
After reviewing the structural properties and formation of Al thin films on the basis of literature, the phenomena of crystal growth taking place in vacuum deposited Al films are discussed. The presence of oxygen in the residual gases affects the layer growth of the individual crystallites directly. The adsorbed oxyge…
Luminescence spectra are reported for BaMoO4. Thee emission occurs only for samples precipitated from acid solutions. Samples show at liquid helium temperature a green emission. (AIP)
The average mobility (\barµ) of majority carriers evaluated from the magneto-resistance of highly oriented graphite through B 2 /( Δ ρ/ρ 0 )=( c /\barµ) 2 +O( B 2 ) is proportional to T -1.6 between 40 K and 80 K, and T -1.2 above 80 K. The T -1.2 dependence was observed by Soule and is in agreement with the theory of…
Abstract Triplet–triplet energy transfer has been shown to occur from poly(ethylene terephthalate) (PET) units to the 2,6‐naphthalenedicarboxylate (2,6‐ND) monomer units in a series of poly(ethylene terephthalate– co –2,6‐naphthalenedicarboxylate) (PET–2,6‐ND) copolymers, as filament yarns, by an exchange mechanism at…
In this third paper of a series, the influence of phonons upon the angle-resolved spectra of electrons photoemitted from the bulk bands of solids is considered. When a tight-binding formalism is used to describe the electronic states of solids, it is possible to divide the electron-phonon interaction into terms that m…