Materials Literature
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The contrast of dislocations in icosahedral quasicrystals observed by transmission electron microscopy is discussed in the framework of the kinematical theory of electron diffraction. It is found that, owing to the special structural features of dislocations in quasiperiodic lattices, there are two basically different…
The solubility limit of α'‐SiAION solid solutions on the Si 3 N 4 ─YN:3AIN composition join in the system Si 3 N 4 ─YN─AIN has been determined at 1800°C. The end members of these solid solutions are Y 0.43 Si 10.7 Al 1.3 N 16 and Y 0.8 Si 9.6 Al 2.4 N 16 . Unit‐cell dimensions of the α'‐SiAION solid solutions in the s…
Abstract On the basis of a two‐sublattice model, the temperature dependent magnetic properties of the intermetallic compounds R 2 Fe 17 C (R = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Lu) are analyzed using the molecular‐field theory. The results of the analysis show that the molecular‐field coefficients n RF are rather se…
Abstract A hot‐stage unit, operating over the temperature range from ambient to 1000°C has been used to study the combustion of black powder. Direct observation of heating of mixtures was supplemented by 35‐mm photomicrography. Results are presented for black powder supplied and mixture prepared in the laboratory.
We have compared the mechanical properties of wool fibers from three different breeds of sheep, Lincoln, Chokla, and Merino. The tensile moduli are highest for Lincoln, followed by Chokla and Merino fibers, but there is a reverse trend in the torsional modulus. The differences in mechanical properties are explained in…
Abstract Die Optik gehört zu den ältesten Teilgebieten der Physik und hat zu deren Entwicklung immer wieder entscheidend beigetragen. In der ersten Hälfte dieses Jahrhunderts wurde die Optik durch die aufregenden Entwicklungen in der Quantenmechanik und Elementarteilchenphysik etwas in den Hintergrund (und aus vielen…
Abstract The use of Fe–Mn–Al–C alloys in oxidizing–sulphidizing environments at elevated temperatures is considered. Applications of SEM, EDX mapping and x‐ray diffraction techniques to the microstructural characterization of the scale development on these alloys are reviewed. Combination of the electron microscope an…
Raman-scattering measurements on single crystals of ${\mathrm{K}}_{2}$${\mathrm{SO}}_{4}$, ${\mathrm{Rb}}_{2}$${\mathrm{SO}}_{4}$, and ${\mathrm{Cs}}_{2}$${\mathrm{SO}}_{4}$ have been made at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on a rigid-ion model using the Gordon-Kim met…
Transition-metal x-ray-emission spectra, corresponding to transitions between the 3s level and the ${\mathit{L}}_{3,2}$ core holes, are studied. The spectra are synthesized from a superposition of two Lorentzian functions, where the relative weighting of the Lorentzians is calculated based on the assumptions of variou…
The crystal structure of Na2SO4(III) (space group Cmcm) and thermal motions of atoms were investigated at 298, 463 and 505 K. The cell parameters are a = 5.6274 (4), b = 8.9664 (11) and c = 6.9737 (9)/~, at 298 K. The R and wR values were 0.0197 and 0.0202 for 984 reflections at 298 K, 0.0201 and 0.0199 for 640 reflec…
Ion implantation is a possible technique to introduce electrochromically active dopants into fine-grained WO3 thin films. However, to be of use, we must be able to distinguish, and erase, effects due to collisional damage. Argon implants were performed in order to investigate damage effects. Pure damage was found to c…
Lamellar microdomains formed in the solvent-cast films of a poly[styrene-block-(ethylene-alt-propylene)] (SEP) diblock polymer were studied by small-angle X-ray scattering (SAXS). The SAXS profiles, displaying a series of peculiar scattering maxima which cannot be ascribed to the higher-order diffraction maxima from a…
High-resolution x-ray scattering experiments to study the critical smectic-A fluctuations in the nematic phase have been performed on a mixture of two nonpolar, two-benzene-ring compounds. The ratio ${\mathit{T}}_{\mathit{N}\mathit{A}}$/${\mathit{T}}_{\mathit{N}\mathit{I}}$ (=0.885) for this mixture is much smaller th…
Abstract Mössbauer spectra were obtained for five Ca-exchanged nontronites and one Ca-exchanged vermiculite as the 2-layer hydrates following dehydration at 200°C. Exchange of the samples with Ca 2+ and subsequent dehydration resulted in the appearance of a shoulder at about −0.50 mm/s in the Mössbauer spectra of some…
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The investigation of the stems of Thinouia coriacea Britton (Sapindaceae), an ichthyotoxic plant from South Brazil, afforded eight glycosides of oleanolic acid. Structures were assigned based on data from partial hydrolysis. 13C-NMR and mass spectral procedures as 3-O-alpha-L-arabinopyranoside (1), 3-O-alpha-L-rhamnop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrom 1-D to 3-D ferrimagnets in the EDTA family: magnetic characterization of the tetrahydrate series MtM(M'EDTA)2.cntdot.4H2O [Mt, M, M' = cobalt(II), nickel(II), zinc(II)]F. Sapina, E. Coronado, D. Beltran, and R. BurrielCite this: J. Am. Chem. Soc. 1991, 113, 21, 7940–794…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass temperature of polymer ring systemsArthur Jing Min Yang and Edmund A. Di MarzioCite this: Macromolecules 1991, 24, 22, 6012–6018Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.acs.org/do…
The effective elongational viscosity for an oriented fiber assembly of discontinuous fibers suspended in a viscous matrix fluid is developed for a fiber array with variable overalp length of both symmetric and antisymmetric geometries. The results for symmetric and antisymmetric geometries are shown to be equivalent.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical and magnetic properties of cobalt(2+) ions in dried and heated silica gels prepared by the sol-gel processKazuo Kojima, Hajime Taguchi, and Jiro MatsudaCite this: J. Phys. Chem. 1991, 95, 20, 7595–7598Publication Date (Print):October 1, 1991Publication History Publis…