Materials Literature
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Measurements of shrinkage temperatures (TS) for fibrous collagen, of equilibrium degree of swelling (v−1) for the same in the amorphous state, and of intrinsic viscosity ([η]) for randomly coiled gelatin are reported. The data were obtained for a large variety of salts which are typical representatives of lyotropic se…
Abstract Results are presented of measurements of the stress dependence of screw dislocation velocities in the {11 2 2} 〈11 2 3〉 slip system (pyramidal slip) of zinc single crystals. The investigations have been carried out on zinc single crystals of 99.999% purity at room temperature. The dislocation mobility has bee…
The formation of nonporous anodic oxide films is treated mathematically for the constant rate of voltage increase method to provide a basis for interpreting reanodization current‐voltage curves. Illustrative reanodization I–V curves are considered for such initial anodic oxide films as nonporous oxide, porous , plasti…
4-Chloro- and 4-bromo-N-salicylideneaniline form two series of solid solutions, each of which spans the whole range of composition. One series is based on the structure of the stable crystalline modification of the bromocompound and these solutions are photochromic, non-thermochromic, and non-luminescent (type α). The…
G. P. Shulman and P. G. Simmonds, Chem. Commun. (London), 1968, 1040 DOI: 10.1039/C19680001040
Experimental and theoretical studies were made to provide information on nitrogen oxide concentrations produced by gas turbine engines. Nitric oxide concentrations of from 100 to 350 ppm, adjusted to stoichiometric conditions, were measured in aircraft turbojet engines. Concentrations of less than 50 ppm, similarly ad…
Abstract Cellulose triacetate I is yielded from cellulose II of mercerized cellulose and rayons in heterogeneous acetylation with lower swelling pretreatment. Both cellulose triacetates I and II with highly ordered structure substantially are converted into cellulose II on saponification. It is possible to obtain tran…
The Mössbauer parameters of a number of trihydroxostannates(II) and their decomposition products and of some basic tin(II) salts are reported and discussed in terms of the tin species likely to be present in these materials.
Solid potassium nitrosodisulphonate (Fremy's Salt) is shown to exist in two distinct crystalline forms. An improved preparation, and crystallisation methods for both forms are given. Stability of both solids and solution is discussed in detail. The forms are compared in terms of their i.r. spectra, magnetic properties…
Abstract Die Sprödigkeit vieler intermetallischer Verbindungen auch bei metallischem Bindungscharakter läßt einen Zusammenhang mit der Gittergeometrie vermuten. Der Einfluß der Atomanordnung auf das Gleiten der Versetzungen wird für die Lavesphasengitter des MgZn 2 ‐Typs (C 14) und des MgCu 2 ‐Typs (C 15) vergleichend…
, was computed using the reaction enthalpy based on the second law.
La comparaison des intensités de signaux de résonance paramagnétique électronique de solutions de biradicaux à échange interélectronique faible, fort ou intermédiaire, montre que le téréphthalate est un biradical à échange faible.
Abstract Lothe's formula for the self‐force on a bent dislocation and Brown's formula for the stress in the plane of a planar loop are generalized to be valid for uniformly moving dislocations when the energy factor is replaced by the Lagrangian factor. Application to straight dislocations in isotropic media shows tha…
Dans DyCrO3 (groupe Pbnm — D162h), les spins de Cr s'ordonnent à TN1 = 146 °K dans un mode G z. Ceux de Dy s'ordonnent à TN2 = 2,16 °K dans une maille qu'il faut doubler selon a et b. On détermine les 8 représentations irréductibles du groupe Pbnm associées au vecteur d'onde k = [1/2 1/2 0] . Celles-ci sont toutes à u…
Magnetic studies have been carried out down to liquid-nitrogen temperatures on NN′-ethylenebis(salicylideneiminato)cobalt(II) and many of its ring-substituted derivatives. No relationship between the detailed magnetic properties and oxygen-carrying ability of this type of compound has emerged. A variety of magnetic be…
Raman spectra of a range of salts containing anions of formula MX62– are reported. Samples were examined in a laser Raman spectrometer as solids and as solutions in acetonitrile and aqueous acids. In addition Raman spectra were recorded of solutions of selenium and tellurium dioxides dissolved in concentrated hydrohal…
The thermodynamic cis⇌trans equilibrium in stilbene and its derivatives can be established at room temperature only by the use of catalysts such as atomic iodine. The latter has now been used to determine the above equilibrium in a number of cases. The fraction of cis-isomer at equilibrium is ca. 0·002 in stilbene and…
Description The Symposium on Electron Fractography was presented during the Seventieth Annual Meeting of the Society held in Boston, Mass., 25—30 June 1967. The symposium was sponsored by Committee E24 on Fracture Testing of Metals. The symposium chairman was C. D. Beachem, Naval Research Laboratory.
Abstract Coordination complexes containing hexa‐acetic acid metal groups are reported with the divalent cations Mg, Mn, Co, Ni, Cu and Zn and with the tetrafluoroborate, perchlorate and nitrate anions. Visible spectra, some infrared data and isomorphism according to X‐ray powder diagrams are recorded. The compounds ar…
The preparation of eleven heteropolytungstate anions, X2ZW17O62H2x–(X = P or As; Z = Mn, Co, Ni, or Zn) is described. These include the first heteropolyanions with MnIII as heteroatom. The stabilities of the anions towards acid and base, and the redox potentials and magnetic moments of the Z heteroatoms are reported,…