Materials Literature
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Several α-Al2O3 specimens were prepared by thermal treatment of pure transition aluminas, already in the form of i.r. pellets. When the starting material is a high external area phase, the resulting sample is still suitable for i.r. work. In particular two preparations are considered, which only differ in the number o…
We have made neutron diffuse-scattering measurements of the magnetic-moment distribution around impurities in Fe as a function of temperature in an attempt to obtain information regarding the range of the exchange interactions. The measurements were made on Fe-based alloys containing 2-3 at.% of Si, Ge, Ti, V, Mn, Co,…
Abstract Ternary liquid‐liquid equilibria of the type aromatic + non‐aromatic + sulpholane were studied. The systems cyclohexane + benzene + sulpholane, 1‐hexene + benzene + sulpholane, hexane + benzene + sulpholane and heptane + toluene + sulpholane were experimentally determined at 25, 50, 75 and 100°C. The binary v…
The contribution of mixed-valence electron delocalisation to the ferromagnetic exchange between the iron(III) ions in Prussian Blue {FeIII4[eII(CN)6]3·14H2O} has been estimated theoretically. Agreement between the calculated and observed values of the Curie temperature is quite good.
Diagrs., graphs, illus., tables. Bibliography p. 251. Translated from French; Distributed by: Trans Tech S.A. CH-4711 Aedermannsdorf, Switzerland
ABSTRACT THREE computer subroutines for numerical calculation of psychrometric properties are discussed. Input parameters required are wet- and dry-bulb temperatures, dew point and dry-bulb temperatures, or relative humidity and dry-bulb temperature. All results are in SI units. Restrictions on the use of certain rela…
A metastable miscibility gap has been found which explains the decomposition behaviour of γ-Mn-Cu alloys. Hardness measurements as well as results of other authors were used to outline the boundaries of the two-phase region. Electron microscopy provided direct evidence for the phase separation prior to α-Mn precipitat…
Electroplating of aluminium on copper and steel substrates was conducted at room temperature. The bath consisted basically of and an alkali metal bromide such as dissolved in a suitable mixture of aromatic hydrocarbons. The bath was operated under conditions resembling industrial operation. Oxygen and humidity were re…
Forty-five aryl esters (R-Ar-CO.O-Ar′-CN) containing terminal cyano and R = alkyl or alkoxy substituents were prepared. The aryl moieties of the esters were either 1,4-phenylene, 2,6-naphthylene or 4,4′-biphenylene. All combinations of these aryl groups were examined and the liquid crystal properties are compared with…
Twins by merohedry can be usefully divided in two classes. Class I: the twin operation is contained in the Laue symmetry of the crystal and twin-related reflexions have equal intensities; in this case the set of intensities collected from a twin is indistinguishable from that collected on a single crystal. Class II: a…
Limiting solutions are discussed for elastic-plastic deformation around rigid particles of both equiaxed and greatly elongated shapes. It is shown that if the matrix can be characterized as a rigid nonhardening continuum the stress concentration at the particle interface and interior is less than two for either equiax…
A finely parallel-grooved nitrocellulose surface has been employed as a model to study by scanning electron microscopy the influence of roughness on the spreading equilibrium of liquid drops. The Cassie and Baxter equation for spherical drops on a composite interface was experimentally confirmed with mercury and a sim…
The lower homologues of the series of 4-n-alkoxy- and 4-n-alkyl-4′-cyanobiphenyls have been prepared and their liquid crystal transition temperatures determined. The trends in the nematic–isotropic liquid (N–I) transition temperatures along the series are compared with observed trends for other homologous series. Thes…
Vanadium-51 n.m.r. spectra of a number of iso- and hetero-polyvanadate anions are reported. Spectra of solutions containing [V10O28]6–(pH 6.5–3.5) are consistent with the known solid-state structure of this anion. The [VO2]+ cation in aqueous solution almost certainly has an octahedral cis-dioxo-structure as its n.m.r…
A previously described model for exchange interaction is applied to the study of antiferromagnetic coupling in binuclear oxo-bridged iron (III) complexes. The energies of the magnetic orbitals (singly occupied d orbitals of each transition ion, partially delocalized towards the ligands surrounding this ion), and of th…
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 Paul W. Palmberg; Quantitative Auger electron spectroscopy using elemental sensitivity factors. J…
Whereas the symmetry of the order parameter is specified by operations preserved at the transition, domains are determined by lost symmetry operations. The number and the relations between domains and domain pairs can be found by grouping the lost operations into left and double cosets. Different types of domains, rot…
The pressure dependence of helium (at 25 °C) and neon (at 150 °C) solubility in vitreous silica has been measured at pressures up to 1400 atm. Results appear to be readily explained by a simple statistical thermodynamical model based on the Langmuir adsorption model. Values for the accessible free volume of the glass…
A survey of hydrogen degradation problems in energy related systems is presented. Nine separate phenomenological classifications of such degradation are presented. Key areas of unsolved problems and needed research are specified. Hydrogen embrittlement mechanisms and hydrogen attack in particular, are pinpointed as cr…
In CuY zeolites degassed at temperatures above 650 K cupric ions are reduced to some extent to cuprous ions.Evidence for this process of auto-reduction was taken from the decrease in weight of the sample, and the detection of a desorbing gas in a volumetric system. The latter was identified as oxygen. U.v. reflectance…