Materials Literature
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The intermetallic compound, BiMn, has been studied by neutron diffraction at temperatures from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 733\ifmmode^\circ\else\textdegree\fi{}K (460\ifmmode^\circ\else\textdegree\fi{}C). In the temperature range 340-360\ifmmode^\circ\else\textdegree\fi{}C to 445\ifmmode^\circ\else\tex…
Various kinds of silica glass and natural and synthetic crystals have been irradiated with fast neutrons at temperatures of ∼250°C and above 300°C. In the glasses, asymmetric paramagnetic resonance lines resulting from the irradiation have been observed with apparent g values of 2.0013±0.0006 and 2.0090±0.0007, and ha…
Porous structures having a continuous solid phase with isolated pores were prepared by the addition of different amounts of crushed naphthalene to an alumina casting slip. Samples of from 5 to 50% porosity were fired together for comparable grain development, eliminating structural variables except porosity. Effects o…
The conduction-electron magnetic susceptibility of graphite has been calculated by using the Wallace two-dimensional band structure. The energy levels induced by the magnetic field are calculated by the method of Luttinger and Kohn, taking into account the large (in this case) effects of band-to-band transitions which…
The magnetic susceptibility of a powder sample of $\ensuremath{\alpha}\mathrm{MnS}$ was measured from 90\ifmmode^\circ\else\textdegree\fi{}K to 800\ifmmode^\circ\else\textdegree\fi{}K by an absolute Gouy method. The N\'eel temperature was found to be 154\ifmmode^\circ\else\textdegree\fi{}K. There was no evidence of th…
Previously published data on Auger ejection from tungsten include the effect of a two percent admixture of metastable ions in the ion beam for A, Kr, and Xe. Data on yield and kinetic energy distribution of electrons ejected by the normal singly-charged ion only are presented in this paper.
The presence in a semiconductor of both signs of current carriers makes it possible to disturb the spatial distribution of these carriers appreciably without giving rise to electrical space charge. As a result, the interaction of particles with acoustic waves leads to certain effects which, at least at low frequencies…
Neutron diffraction patterns have been obtained for polycrystalline Mn${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$ at 300\ifmmode^\circ\else\textdegree\fi{}K and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The fraction of tetrahedral sites occupied by ${\mathrm{Mn}}^{+2}$ has been found to be 0.81\ifmmode\pm\else\textpm\fi{}0.0…
Abstract The rate of oxidation of thin films of polybutadiene have been studied between 50 and 90°C. The films were prepared directly from latex by dipping, and thoroughly purified. The oxidation rates were found to go through an induction period, to accelerate rapidly to a maximum, and then to decrease to low values.…
All but one of the multiple ferromagnetic resonances observed by White and Solt in a sphere are shown to correspond to modes in which the oscillating part of the magnetization is independent of $r$ (the only case ordinarily considered) or varies linearly with $r$ in the sample.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Formation of Pyridoxal and Pyridoxal 5-Phosphate Hydrazones1Ronald G. WiegandCite this: J. Am. Chem. Soc. 1956, 78, 20, 5307–5309Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published inissue 1 October 1956https://pubs.acs.org/doi…
For the normal heavy-atom method of solving crystal structures the Fourier series, whose coefficients are given in moduli by the observed intensities and in phase by the heavy-atom contribution, is summed. It is shown that a Fourier series with coefficients quite different from these shows the unknown part of the stru…
Ferromagnetic resonance in ferrites is reviewed. The concept of tensor permeability, the influence of magnetic anisotropy, demagnetizing fields, and damping mechanisms are discussed. Special consideration is given to coupled magnetic systems and the behavior in ferrites with compensation points. The general theoretica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Quantitative Evaluation of the Effect of Hydrogen Bonding on the Strength of Dibasic AcidsF. H. Westheimer and O. T. BenfeyCite this: J. Am. Chem. Soc. 1956, 78, 20, 5309–5311Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published…
Abstract The adsorption of zinc chloride on calcite, dolomite and Casubstituted magnesite crystals from aqueous solution is treated theoretically; and a standard adsorption process is thereby rigorously defined. The thermodynamic characteristics Δ F 0 θ, Δ H 0 θ and Δ S 0 θ are determined for this process by means of…
A theory is developed of the continuous radiation spectrum which accompanies nuclear capture of atomic electrons. It is shown that quantitative predictions of the spectrum intensities must take into account the influence of the electrostatic field of the nucleus on the radiation process. This is accomplished by evalua…
A review of the properties, applications, and engineering significance of ferrites below microwave frequencies is presented. The survey includes a discussion of the nature of ferrites, their magnetic and electrical properties, the use of the μQ product as a design index of efficiency, core losses, and the effects of a…
Abstract The reaction of cellulose, cellobiose, and their acetyl derivatives with trifluoroacetic acid has been studied by the method of infrared spectrophotometry. Changes in optical density were measured at 25°C. as a function of time. Band assignments are adequate for the present study, although some uncertainties…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of Formation of Sodium Molybdate, Molybdic Acid and Aqueous Molybdate IonRobert L. Graham and Loren G. HeplerCite this: J. Am. Chem. Soc. 1956, 78, 19, 4846–4848Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published inissue 1 Oc…