Materials Literature
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The heat capacity and the enthalpy of the quantitative thermal decomposition of crystalline Au2O3 have been measured by differential scanning calorimetry. A value of –13.0±2.4 kJ mol–1 is calculated for ΔfH⊖(Au2O3,s).
Interactions of calcium ions with uncharged sugars lead to complexes in which the calcium ions are surrounded by square-antiprism co-ordination shells composed of water molecules and sugar hydroxyl groups.
Stress corrosion crack growth rates (dA/dT) as a function of stress intensity factor (K) were determined over a wide range of electrode potentials for AISI 4340 steel (200-ksi yield strength level) in deaerated 3.5 percent sodium chloride solution buffered to pH 3.8. Particular emphasis was placed on conducting the st…
The state of stresses and displacements in thin films due to the presence of a periodic distribution of screw dislocations and edge dislocations is investigated by the method of continuously distributed dislocations and the three-dimensional theory of elasticity. The dislocations are straight and pierce obliquely the…
Abstract Changes in the internal morphology of lint cotton fibers during purification and swelling treatments were investigated by measurement of nitrogen adsorption at liquid nitrogen temperature. Surface areas and pore size distributions were calculated from the adsorption isotherms and compared with findings from m…
Abstract The vapour pressure curve of liquid potassium was measured up to the critical point which was found at T crit = 1925 °C ± 30 and P crit = 155 ± 15 bar. Using these vapour pressure data and existing density data of the vapour and liquid at saturation pressure the vaporization entropy of potassium as a function…
Continuing preceding research on this field, angular distributions of η and δ electrons from thin films of Al and Au have been investigated by means of a considerably improved apparatus. Measurements have been made in forward and backward directions with primary energies in the interval 1 to 20 keV with normal as well…
The amounts of strontium and calcium in the lead-bearing barite from hydrothermal solution were found to increase with the lead content of the barite. This fact suggests that the difference between DMPbSO4 = [M/Pb]PbSO4/[M/Pb]aq and DMBaSO4 = [M/Ba]Baso4/[M/Ba]aq primarily contributes to the increment of both trace el…
Hysteresis in a ferromagnetic material subjected to cyclic magnetisation is represented by an idealised elliptical B/H loop which neglects harmonic quantities and enables the flux density and the magnetising force to be related by complex permeability. The concept is then developed for steels with nonlinear magnetisat…
Abstract not Available.
An electrostatic-fluxmeter probe has been used to obtain a direct measurement of the electric field at a cylindrical conductor during a.c. corona. For conductor diameters of 1.59, 2 and 2.75 cm, the resultant electric field falls below the onset level for both positive and negative corona. For the positive discharge,…
Халькогениды переходных металлов со слоистой структурой и особенности заполнения их бриллюэновой зоны, Калихман В.Л., Уманский Я.С.
Nicandra physaloides(Solanaceae) contains four new methyl steroid, relatives (1)–(4), all containing an aromatic ring D; the constituion of the first is demonstrated by crystallographic analysis using direct methods.
Aurasperone C (III) shows properties closely related to those of aurasperone B (II) and gave dianhydro compound (V) on hydrochloric acid treatment. Partial methylation of (V) with methyl iodide afforded a monomethyl ether identical with aurasperone A (I). NMR studies, including solvent induced methoxyl shifts, indicat…
Abstract Multiple glass transitions in emulsion polymerized butadiene—acrylonitrile copolymer at leass than 36% acrylonitrile by weight were studied using the Differential Scanning Calorimeter. The appearance of two rather than one transition was shown to be related to the drift in composition with degree of monomer c…
Abstract An activated diffusion, or site‐hopping, mechanism is used to describe surface diffusion of gases through porous media. This analysis provides a useful and accurate method for correlating data at submonolayer coverages on energetically heterogeneous surfaces. The data needed to use this correlation are surfac…
Phase transformations in eutectic gold‐silicon alloy thin films on single‐crystal silicon substrates have been studied as a function of the rate of cooling from the melt by utilizing metallography, resistivity measurements, and x‐ray and electron diffraction. Cooling at rates <10 3 °C/sec results in the eutectic struc…
The influence of grain size on the deformation behaviour of a-zirconium in the temperature range 77° – 443°K has been investigated. The flow stress variation with grain size follows the Hall-Petch equation σ = σi + K d−1/2. Work hardening was found to increase with decrease in grain size; also for any grain size and s…
Abstract Durch Festkörperreaktionen von TeO 2 mit MnO, CoO bzw. NiO unter N 2 wurden folgende Verbindungen erhalten und durch Röntgen‐Pulverdaten charakterisiert: MTe 6 O 13 (M = Mn, Co), MTe 2 O 5 und M 2 Te 3 O 8 (M = Mn, Ni), MnTeO 3 und M 4 Te 3 O 10 (M = Mn, Co), Mn 2 Te 3 O 8 und Ni 2 Te 3 O 8 kristallisieren mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiferromagnetic interactions in diamminecopper(II) carbonateDavid Y. Jeter, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1972, 11, 1, 185–187Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 Januar…