Materials Literature
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A differential anomalous x-ray scattering technique has been developed for structural studies of disordered and amorphous systems. The results on amorphous Ge${\mathrm{Se}}_{2}$ are consistent with the twofold coordination of Se and the fourfold coordination of Ge. The results on amorphous GeSe are consistent with thr…
Abstract The microstructure of melt-crystallized linear polyethylene has been correlated with the variables of crystallization for most readily attainable conditions. All samples are filled with well defined lamellae with an average chain inclination of about 35° to lamellar normals. The lamellar thickness depends up…
Abstract The lamellar microstructure of a wide range of melt-crystallized polyethylenes has been examined in the context of spherulitic organization. Radial continuity is achieved through lamellar continuity. In the simplest cases ridged or planar sheets grow outwards along b, maintaining their identities over distan…
Abstract The morphology of melt-crystallized polyethylene has been surveyed, and it has been revealed that all specimens are highly lamellar. Classification of the textures is possible in terms of the lamellar profiles in b-projection, i. e. down the radii of spherulites. For polyethylene crystallized as the orthorh…
Abstract Die Phasenbeziehungen in den Titelsystemen werden unter besonderer Berücksichtigung der Sn‐ Spinellbildung untersucht.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWear of anodized aluminum-polymer lithographic printing platesJohn W. Noble III and Henry Leidheiser Jr.Cite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 2, 344–350Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June…
The Mössbauer spectroscopy is applied to the perovskite compound RbFeF 3 . It is concluded that in the phase realized below T 1 (39 K) the spontaneous magnetization originates in a canting of the spins, i.e. the spins are almost along a pseudo-cubic [011] axis but cant by about 6° from the [011] axis, yielding spontan…
Abstract It is shown that the chemical shift of the generally utilized internal reference for 1 H NMR measurements in superacid media, namely, tetramethylammonium bromide, which is normally fixed at 3.10 ppm from external TMS, changes with the composition of the acid mixture (HF or HSO 3 F:SbF 5 ). This is attributed…
Abstract The visible luminescence spectrum of solid neon containing small amounts of N 2 or O 2 is investigated at 7.8 K using low‐energy electrons. Double‐doping experiments employing N 2 and × (where × is either O 2 , CO or Ar) are also carried out. Particular attention is given to the interpretation of the α(N 2 D—…
The pyroelectric properties of NH4HSeO4 crystals were measured in the temperature range of 100–300 K. A new phase transition was found at 109 K. It was noted that 80% deuteration of the NH4HSeO4 crystals caused these crystals to become non-ferroelectric.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSecond surface virial coefficient for argon adsorbed on graphiteS. Sokolowski and J. SteckiCite this: J. Phys. Chem. 1981, 85, 12, 1741–1746Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June 1981https://pubs.acs.org/do…
Electrical resistivity measurements have been used to define the Néel temperature in tensile strained chromium. The Néel temperature was observed to increase linearly with tensile stress at a rate dT N/dS = 2·0 × 10−8 K m2 N−1. A model of the strain distribution in chromium was used to estimate the Néel temperature sh…
Theoretical and experimental contrast ratios are compared for homogeneous-to-homeotropic liquid-crystal cells containing fluorescent dye molecules activated by ultraviolet light. Two-color fluorescent displays are described in which one active fluor dissolved in the liquid crystal is used as a UV shutter to switch a p…
Zero shear-rate rheological properties are calculated for dilute emulsions composed of Newtonian droplets dispersed in a continuous immiscible Newtonian phase and containing a rigid concentric spherical inclusion in the interior of each droplet. A first-order analysis of the deformation of such occluded droplets from…
Abstract The Raman spectra of the three solid phases of methyl ammonium chloride and its deuterated analogues have been measured and compared with IR results available in the literature. The static and correlation field splitting of the internal modes have been studied by the use of isotopic solid solutions. The methy…
Large pyroelectric coefficient (1.2 × 104 μC/m2°C at T − Tc ≃ 2°C) in single crystals of SbSI were measured over a temperature range encompassing the ferroelectric phase transition. Simultaneous measurement of the pyroelectric and dielectric constants-were made and the pyroelectric figure of merit p/K was evaluated at…
Abstract The dependence of the Critical Oxygen Index values of some thermoplastic materials on sample sixe is reported. The extent of melting of this class of material is shown to be important in determining the effect of sample size on the index.
This paper describes a small wind tunnel that was constructed to study the effects of wind, electric field, and insulator geometry on the insulator contamination process. The wind tunnel is operated with a kaolin clay and NaCl salt injection system. A voltage source is also available. Several insulator shapes, with vo…
Compression tests on alumina single crystals have been performed under 1500 MPa hydrostatic pressure at temperatures between 25°C and 1800°C Specimens tested for prismatic slip failed below 200°C and those for basal slip below 600°C. Critical resolved shear stresses for both slip systems, have been in the range 100 MP…
Partially Carbamate Reaction of Cellulose with UreaThe reaction of cellulose with urea and substituted ureas has been studied by Segal' and Nuessle.2Some cellulose carbamate derivatives of aromatic amines3 were investigated to prepare in relation to facts that the treated cotton cellulose with urea a t 120°C in alkali…