Materials Literature
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Electron spin resonance at 3.2 cm has been observed from copper(II) in single crystals of copper(II) bis-acetylacetonate diluted to ½ mole % with palladium(II) bis-acetylacetonate at 77°K and 300°K. The parameters of the spin Hamiltonian have been expressed in terms of the atomic orbital coefficients of molecular orbi…
The first six coefficients in the expansion of the susceptibility χ, and its inverse, χ −1, in ascending powers of the reciprocal temperature, have been determined for the Heisenberg model of a ferromagnetic, for any spin value, S, and any lattice. The first five coefficients appropriate to the magnetic specific heat,…
Zur Berechnung der Wirkungsquerschnitte für elastische und unelastische Streuung von Elektronen an Atomen in Bornscher Näherung werden die Atomformfaktoren der Hüllenelektronen, die die Abschirmung der Kernladung durch die Atomhülle beschreiben, aus Hartree-Funktionen * in Abhängigkeit von der dimensionslosen Größe η=…
Abstract Lorsqu'on trempe un polymère ainorphe à partir d'une température T 0 > T g à une température T 1 < T g , T g , btant la température de transition vitreuse, on observe une contraction isotherme du volume à T 1 qui se poursuit généralement pendant une longue periode. On decrit ce phenombne à partir des ob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Photochemical Isomerization of Azobenzene1George Zimmerman, Lue-Yung Chow, and Un-Jin PaikCite this: J. Am. Chem. Soc. 1958, 80, 14, 3528–3531Publication Date (Print):July 1, 1958Publication History Published online1 May 2002Published inissue 1 July 1958https://pubs.acs.…
Summary A theory is developed for experiments with mixtures of q components whose purpose is the empirical prediction of the response to any mixture of the components, when the response depends only on the proportion of the components and not on the total amount.
A study has been made of the Barkhausen pulses that occur during polarization reversal in single crystals of barium titanate. By both pulse counting and oscillographic techniques, the pulse shapes and in particular their heights and rise times have been studied as a function of the crystal thickness and the applied fi…
The neutral-salt complex with glycine, di-glycine manganous chloride dihydrate, (N${\mathrm{H}}_{2}$C${\mathrm{H}}_{2}$${\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H})}_{2}$ \ifmmode\cdot\else\textperiodcentered\fi{}Mn${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}${2\mathrm{H}}_{2}$O, is found to be ferroele…
The course of the changes produced by exposure in nuclear reactors and the subsequent alteration of the radiation-induced property changes caused by heating were followed by measuring the dilatation, refractive index, rotatory power, and birefringence. The fast-neutron dosages determined by a comparison of radiation d…
The large part of the ferromagnetic anisotropy of ${\mathrm{Co}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{O}}_{4}$ attributed to the presence of ${\mathrm{Co}}^{2+}$ is explained, for small $x$, by means of a one-ion model. The residual orbital angular momentum $\ensuremath{\alpha}(\ensuremath{\simeq}1)$ of ${\math…
The antiferromagnetic arrangement of moments in MnO, FeO, CoO, and NiO have been investigated by powder neutron diffraction. The results for the four oxides are consistent with a structure in which the magnetic moments are arrayed in ferromagnetic sheets parallel to (111) planes, and the direction of magnetization in…
Abstract Paramagnetic resonance in rare earth ions with an even number of unpaired 4ƒ electrons is discussed with particular reference to experimental results in Pr3+, Tb3+ and Ho3+ ions in single crystals of the ethyl sulphates. The crystal field theory of Elliott & Stevens is used to interpret the results. Some…
The I127 NMR absorption line of iodide ion in aqueous solution is broadened by the presence of iodine molecules. The broadening is consistent with the diminution of phase-memory time caused by strong quadrupole coupling in triiodide ion, which occurs in dynamic equilibrium. On the basis of a simple bimolecular mechani…
The preparation of CuSeO 3 . 2 H~O is described. The unit cell is orthorhombic with the symmetry P212121. The unit cell has a ----6"671, b = 9"193, c = 7.384 /~ (=k0"010 fi~) and contains four formula units of CuSeO 3 . 2 I-I20. The determination of the structure was carried out by means of Patterson, Fourier and (Fo-…
Elastic strains of up to 4% can be attained in a copper-aluminium-nickel alloy in the form of a single crystal suitably heat treated. The high elasticity is due to a reversible martensite transformation induced by stressing. The methods of production and heat treatment of large crystals are described together with det…
Rectifying junctions may be made by heating silicon-aluminum or silicon-boron alloys in contact with n-type silicon carbide. The measured solubility of carbon in liquid silicon is consistent with the view that these junctions are produced by an alloying and regrowth mechanism. Nonrectifying contacts may be made in an…
Abstract Contrary to the aliphatic polyanhydrides prepared by Carothers, polyanhydrides containing aromatic nuclei in the main chain possess high melting points and good hydrolytic stability. A number of different aromatic polyanhydrides were prepared. Their preparation and properties, such as fiber‐forming properties…
A model of cleavage applicable to metals cleaving on the slip plane is developed in which a crack is initiated at the end of a low angle tilt boundary terminating inside the crystal. The strength of the metal is determined by the difficulty of growth of the crack. Satisfactory agreement is obtained with the experiment…
Abstract 1) The infrared spectra of the lower members of methoxy-, methylmethoxy and methoxy endblocked dimethyl-polysiloxanes have been discussed by comparing them with that of dimethylether, dimethylpolysiloxanes, and so on. 2) The characteristic absorption band of Si—OCH3 group has appeared near 1190 cm−1. 3) Excep…
Abstract The action of ionizing radiations on polymers leads, in general, to degradation and, in certain cases, to some further polymerization (crosslinking). It is known, on general physical grounds, that the energy of the radiation is converted into ionization and excitation of the molecules present in the system. T…