Materials Literature
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Abstract The morphology of poly(butylene terephthalate) (PBT) crystallized from the melt at various temperatures was studied by small‐angle light scattering, polarizing microscopy, and wide‐angle x‐ray diffraction. Spherulites with a maltese cross at 45° to the polars formed at lower temperatures while spherulites hav…
The glass-forming region was determined for the system Ge-Bi-Se; 13 at.% Bi was found to be incorporated at its maximum content into glasses, the Ge content of which was 20 at.%. Electrical resistivity, thermoelectric power, and optical absorption coefficient were measured mainly on a series of Ge20BixSe80−x glasses (…
Abstract Investigations of morphological changes which are induced in segmented elastomers by annealing and quenching are reported. Four different polymers were studied each based on the same soft segment—1000 or 2000 molecular weight poly(tetramethylene oxide). The hard segments were 4,4′‐diphenylmethane diisocyanate…
The mechanism of formation of porous silicon layer (PSL) has been studied according to the following experimental results. PSL is formed by the local dissolution of silicon which occurs only at the base of the pores. The concentration of the electrolyte in the pores of PSL is constant during anodization and the anodic…
Abstract A complete assignment for the modes obtained from resonance Raman scattering on cis‐ and trans‐polyacetylene is reported. The Raman lines in the cis‐isomer indicate a well expressed one dimensional behaviour of the chain. From the line profile and line position of the resonance enhanced CC stretch modes in t…
Because of their small particle sizes and v~riable degrees of crystal perfection, it is not surprisi4g that clay minerals proved extremely difficult to characterize adequately prior to the development of ~odem analytical techniques. Problems in charactetization led quite naturally to problems in nomenclatute, undoubte…
"Optical Crystallography." Optica Acta: International Journal of Optics, 27(2), p. 145
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 40. Electronic spectra and four-orbital energies of free-base, zinc, copper, and palladium tetrakis(perfluorophenyl)porphyrinsP. J. Spellane, M. Gouterman, A. Antipas, S. Kim, and Y. C. LiuCite this: Inorg. Chem. 1980, 19, 2, 386–391Publication Date (Print):Febru…
Transverse and longitudinal elastic strain have been measured for electric fields applied along the 〈100〉 direction in single crystals of lead magnesium niobate [Pb(Mg1/3Nb2/3)03], using a bonded strain gauge technique. A quadratic electrostrictive relation holds between induced elastic strain and electric polarizatio…
Thermal density fluctuations within phases and finite interphase widths lead to systematic deviations from Porod's law. The validity of present methods used to analyze these deviations and determine diffuse-boundary widths is determined. In view of the inadequacies found in these methods, a simple yet accurate method…
Structural phase transitions can be studied by a variety of techniques; macroscopic fields, X-ray, light and neutron diffraction, and resonance methods. The information which can be obtained by these different techniques about the order parameter and susceptibility at structural phase transitions is described and comp…
Abstract Hydrotalcite solid solutions were prepared by coprecipitation followed by hydrothermal treatment between 150° and 250°C. Based on the structural formula [Mg 1−x Al x (OH) 2 ] x+ [(CO 3 ) x/2 • mH 2 O] x− , pure solid solutions were formed in the range A1/(A1 + Mg) = 0.2 to 0.33, where m = (1 − 3x/2). Maximum…
A systematic exposition is given of a recently developed theory of the low-frequency spin dynamics of any magnetic material in which the magnetic order is caused by exchange forces that considerably exceed the relativistic interactions. The proposed approach does not use any model representations of the state of the m…
Administration of cis-dichlorodiammineplatinum(II) may be associated with a number of serious side effects, including nephrotoxicity, gastroeintestinal side effects (nausea, vomiting, and diarrhea), myelosuppression, and occasional transient elevations in liver function tests. In addition, ototoxicity (tinnitus and he…
Abstract Polarized neutron diffraction has been used to investigate the spin delocalization from the high‐spin Fe(III) sites to the low‐spin Fe(II) in deuteriated Prussian Blue, Fe 4 [Fe(CN) 6 ] 3 · xD 2 O. Measurements of the 111, 200, and 400 reflections were made on a powdered sample at 3 K and 4.8 T using a neutro…
Abstract Enterobactin, eine Verbindung mit drei o‐Dihydroxyphenylgruppen, wird aus Kultu ren von Klebsiella pneumoniae isoliert und potentiometrisch, spektrophotometrisch und cyclisch‐voltammetrisch untersucht.
Abstract From various new organosilicon polymers many useful ceramics are obtained by heat treatments. The new polymers that have been made in my Laboratory are called Mark I, II and III. High strength SiC fibre, SiC sintered bodies, refractory alloys, and refractory polymers have been obtained from those polymers. In…
Abstract Results obtained when investigating the fracture behaviour of wood have suggested the possibility of making composite materials with high work of fracture and low density, at the expense of moderate loss of stiffness. The reinforcing elements of the composite are made in the form of cylindrical tubes with hel…
A comparison of angle-resolved photoemission energy distributions for pure graphite and the intercalation compound Li${\mathrm{C}}_{6}$ show that considerable charge is transferred from Li to C, as expected; but the valence bands do not shift uniformly upon intercalation, in contradiction to the rigid-band approximati…
An experimental research of thermal and optical bleaching in the chalcogenide vitreous semiconductors of the As–Se system and in elemental vitreous selenium hasbeen carried out. A strong dependence of the bleaching features on the ratio of the components is shown. To explain the bleaching process the configurational m…