Materials Literature
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The compressive stress for the shrinkage of a large pore during sintering has been analyzed by combining the effects of the pore size, the ratio of pore size to grain size, and the coordination number of the pore. Alumina has been selected to illustrate this model. The result shows that the compressive stress is a pos…
Grain boundaries in tungsten carbide crystals (hexagonal structure c/a = 0.976) show many coïncidence orientations. The most frequent orientation has a coïncidence index Σ = 2. H.R.E.M. images of such grain boundaries have been realized. These grain boundaries show a defect structure, only due to the mismatch of the a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStacked complexes of iridium and a novel form of charge compensationPaul G. Rasmussen, J. Bruce. Kolowich, and Juan Carlos. BayonCite this: J. Am. Chem. Soc. 1988, 110, 21, 7042–7049Publication Date (Print):October 1, 1988Publication History Published online1 May 2002Publish…
A practical method to correct X-ray powder diffraction patterns for the effects of preferred orientation in the case of monoclinic crystals is presented. The method is based on the use of symmetrized harmonics to describe the preferred orientation. To obtain a texture-free result the diffraction pattern must be measur…
Abstract Conversion distribution in particles of chlorinated poly(vinyl chloride) (CPVC) is conceptually described based on balance equations involving mass transfer and chemical reaction. In the physical sorption of chlorine in poly(vinyl chloride) (PVC) as measured by the constant volume cell method, equilibrium con…
Pseudo-hexagonally twinned orthorhombic crystals generally exhibit three domain variants related by mirror planes or (approximately) by 120° rotations. The reciprocal lattices of the three domains coincide partially. Those reciprocal-lattice points hkl with h + k = 2N coincide or are split depending upon the deviation…
Electrical conductivity due to halide ions has been measured for the glasses in the system 30SiO 2 · (70 − x )PbO · x PbX 2 (0 < x < 17.2 mol%; X = F, Cl). The conductivity increases with x by several orders of magnitude for both series of glasses. The contribution of principal factors to the conductivity has be…
The crystal structure of α-CrPO4, previously solved from high-resolution synchrotron powder X-ray data, has been refined by the Rietveld method. The peak shape variation is well fitted by a convolution of Gaussian and Lorentzian terms, which incorporate both instrumental and sample-broadening contributions. The struct…
Abstract The critical specimen thickness up to which the Cliff‐Lorimer method can be used without additional corrections was measured on some steels and nickel‐base alloys for soft x‐rays with line energies between 1 and 3 keV. The critical thickness values measured are 50 nm at 1 keV and 450 to 500 nm at 3 keV. These…
Abstract Through the exact number of contact points between the two components of a solids system, the reactivity of the solids is expressed in terms of the molar ratio, the particle size ratio and the nature of the reacting system. The theory is confirmed by existing experimental data, revealing that the contact poin…
Cristallisation dans P2/m. La structure est constituee d'octaedres et de colonnes hexagonales s'ordonnant en tunnels hexagonaux
The rheological behaviour of foam, prepared from an aqueous solution with lauryl sulphate as surfactant, has been measured with a viscometer as a function of the blow ratio, bubble diameter distribution and concentration of the thickener used. The influence of wall slip and of hysteresis effects on the rheological beh…
An accurate representation of the magnetisation curve including the incremental permeability curve, is presented. It is based on selected powers of B (not generally integer) with positive coefficients giving a power series. The fit is shown to be superior to those obtained with polynomial and rational fraction polynom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiad sequence distribution in copolyesters of 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acidA. Muhlebach, R. D. Johnson, J. Lyerla, and J. EconomyCite this: Macromolecules 1988, 21, 10, 3115–3117Publication Date (Print):October 1, 1988Publication History Published onli…
During the liquid‐phase sintering of MgO‐CaMgSiO 4 systems in N 2 atmosphere, the total porosity and the average pore size increase while the number of pores decreases. The negligible permeability of entrapped nitrogen through the liquid matrix and the observed linear relationship between the number of pores and that…
Thermorheological simplicity (TRS) in the glass transition is derived from the principle of temperature (actual and fictive)‐time equivalence. Methods of formulating structural relaxation models consistent with TRS are given. Nonlinear dependence of properties on glass structure ( T f ) and temperature ( T ) is taken…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTf-Element/crown ether complexes. 22. Preparation and structural characterization of lanthanide chloride complexes of 12-crown-4Robin D. Rogers, Andrew N. Rollins, and Matthew M. BenningCite this: Inorg. Chem. 1988, 27, 21, 3826–3835Publication Date (Print):October 1, 1988Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteronuclear NMR studies of cobalamins. 9. Temperature-dependent NMR of organocobalt corrins enriched in carbon-13 in the organic ligand and the thermodynamics of the base-on/base-off reactionKenneth L. Brown and Sherri Peck-SilerCite this: Inorg. Chem. 1988, 27, 20, 3548–3…
Abstract The solubilities of HCl-treated samples of corundum, gibbsite, boehmite, and diaspore in aqueous solutions at 298 K and one atmosphere pressure were determined from undersaturated and supersaturated initial conditions. Solution characteristics at apparent equilibrium were measured and used to calculate equili…
The inner-sphere water coordination number for Eu3+ and Gd3+ complexed with five DTPA analogs, in which one or two terminal carboxylate groups are functionalized as propyl amides or propyl esters, have been studied using phosphorescence lifetime and nuclear magnetic relaxation dispersion (NMRD) measurements. Both meth…