Materials Literature
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The influence of age and of corticosteroid treatment on viscoelastic properties of skin samples has been studied in rats. Hysteresis curves were evaluated with increased extension for each cycle. Maximum stress and modulus of elasticity were increased by age and by 10 days' prednisolone treatment. However, hysteresis…
Goldschmidt factors taking into account substitution ions are calculated for a series of doped PZT. X-ray measurements in the paraelectric phase are reported. The occurrence of a ferroelectric or of an antiferroelectric phase is related to the tolerance factor and to a hydrostatic stress on the ions in the B position.
It is well known that radiation (both particle and photon) can cause substantial density changes in certain solids. In cases where the radiation damage is non-uniformly distributed, these changes are manifested as gradients of residual stress. With ion bombardment, where penetrations under accelerating voltages of sev…
Crystal structure of sugilite has been refined by the least squares method using 435 reflections measured on an automated single crystal diffractometer using MoKα radiation. The final unweighted R-factor is 0.047 for 429 reflections. The cell dimensions are: a=10.007(2), c=14.000(2)Å; space group P6⁄mcc. Sugilite is i…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Richard Williams; Electrochemical reactions of semiconductors. J. Vac. Sci. Technol. 1 January 19…
Professor Helfrich is the 1976 winner of the Hewlett-Packard Europhysics Prize which is awarded annually for outstanding achievement in solid state physics. The award which is to be presented at the opening of the 19th. Congress Ampre in Heidelberg on 27 Sept., 1976 is for his contributions to the physics of liquid cr…
The crystal structure of a β-hydroquinone clathrate of stoicheiometry 3C6H4(OH)2·xH2S (x= 0.768) has been determined from three-dimensional X-ray data. The hydrogen-bonded [OH]6hexagonal rings are nearly but not exactly planar, and a difference map revealed an ordered proton arrangement. The clathration cavity is roug…
The rate of growth of slightly soluble ionic precipitates from aqueous solution is affected by the presence of a co-ordinated layer of water molecules clustered around a central ion. When the ions are small and highly charged, water molecules in the cluster are firmly held; in such solutions it is known that ion assoc…
Abstract Polystyrenes containing end groups derived from azobisisobutyronitrile (AIBN) were subjected to thermal degradation at 280–350°C and the rates of volatilization compared with those of thermally and anionically prepared polystyrene. At 330–350°C the degradation of the AIBN polymer resembled that of the thermal…
Abstract In the thermal oxidation of low density polyethylene (PE) in the melt phase and isotactic polypropylene (PP) in the solid phase, the changes in molecular weight distribution (MWD), weight average molecular weights ( M ω), and average number of chain scissions have been studied by gel permeation chromatography…
Two homologous series of liquid crystalline substances have been synthesized and their mesomorphic properties studied. These are (i) trans-p-n-alkoxy-α-methyl cinnamic acids and (ii) trans-p-n-alkoxy-α-methyl-p'-cyanophenyl cinnamates. The esters are colourless and fairly low melting materials of high positive dielect…
The ferroelectric-paraelectric phase transition in PbZrxTi1-xO3 (0.88 < x < 1) has been investigated using x-ray, dielectric and optical techniques. It is shown that a changeover from first-order to second-order behaviour occurs at around x = 0.94. The exponent, β, of the order parameter in the region of this critical…
It has been shown previously that in analogy with the Borrmann effect in X-ray diffraction from crystals there is an anomalous increase in the transmitted intensity near the Bragg reflection band in an absorbing cholesteric liquid crystal. In this communication detailed experimental studies of this effect carried out…
Textural laser diffraction and light-scattering studies on homeotropically aligned nematic material (MBBA) doped with cholesteryl nonanoate (CN) has been carried out with and without an applied ac (50 Hz) electric field. In the narrow range of the ratio of the pitch p to the thickness l of the cell, 1.2&lt;p/l&…
Article A New Class of Polyethers-Poly(1,4-Dichloro-2,3-Epoxybutane)s - Synthesis, Mechanism and Property Aspects was published on January 1, 1976 in the journal Pure and Applied Chemistry (volume 48, issue 3).
Abstract A series of fluorene and fluorenone diamines were polymerized with two aromatic dianhydrides, and the resulting polyamic acids were cyclodehydrated to aromatic polyimides. A study of the mechanical properties of the polyimide films disclosed they are among the stiffest reported to date, with an excellent rete…
Crystals of K2S5 are orthorhombic, space group P212121 with Z= 4 in a unit cell of dimensions: a= 6.494(1), b= 6.600(2), c= 17.414(5)Å. The structure has been elucidated by vector methods from 656 independent diffracted intensities measured on a four-circle diffractometer and refined to R 0.045. The [S5]2– anion exist…
Abstract The disproportionation of thiosulfate, trithionate, tetrathionate and sulfite in acidic solutions has been studied at relatively high temperatures. Thiosulfate hardly decomposes in the absence of sulfuric acid, even at 150 °C, but decomposes very easily in the presence of sulfuric acid at 70 °C, forming eleme…
The phase diagrams for the mixtures of p-cyanophenyl-p-alkylbenzoates and p-alkoxycarbonyl-oxyphenyl p-butyloxybenzoates were investigated. The Schröder-Van Laar equation was found inapplicable for calculations of composition, eutectic-mixture melting points and crystalline-nematic transition heats of these compounds.
This series was organized to provide a forum for review papers in the area of corrosion. The aim of these reviews is to bring certain areas of corrosion science and technology into a sharp focus. The