A rule for chemical shifts of X-ray absorption edges
An empirical rule governing the chemical shifts of X-ray absorption edges has been proposed and tested.
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Influence of Magnetic Order on Conduction Electrons and Phonons in Magnetic Semiconductors
Magnetic correlations influence the energy of conduction electrons through the exchange coupling. A magnetization leads to a splitting of the band where, however, the states of the higher band are unstable against spin-flip with spin-wave production. The rather unknown ion-position dependence of the spin Hamiltonian c…
Effects of Atomic Configurational Changes on Hyperfine Interactions in Concentrated Iron-Cobalt Alloys
Room temperature 57Fe Mössbauer spectra were taken on atomically ordered and disordered iron-cobalt samples as a function of composition between 25 and 75 at.% cobalt. The degree of long-range order was determined in selected samples using neutron diffraction. The maximum values of the effective field (He) and isomer…
Heteropoly blues. V. Electronic spectra of one- to six-electron blues of 18-metallodiphosphate anions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly blues. V. Electronic spectra of one- to six-electron blues of 18-metallodiphosphate anionsElias Papaconstantinou and Michael T. PopeCite this: Inorg. Chem. 1970, 9, 3, 667–669Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Publi…
Role of p-phenylene groups in nematic liquid crystals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of p-phenylene groups in nematic liquid crystalsMichael J. S. Dewar and Ronald S. GoldbergCite this: J. Am. Chem. Soc. 1970, 92, 6, 1582–1586Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://doi.org…
Formation of diethylene glycol as a side reaction during production of polyethylene terephthalate
Abstract Polymers of poly(ethylene terephthalate) (PET) always contain a certain amount of incorporated diethylene glycol (DEG), substituting the incorporated glycol. DEG is formed in a side reaction during the ester interchange of dimethyl terephthalate (DMT) with ethylene glycol or during direct esterification of te…
Surface Rainbows: A Similitude between Classical and Diffractive Scattering of Atoms from Crystalline Surfaces
A preliminary account is given of sharp “rays” and related intensity structure revealed by high-resolution classical calculations of atomic scattering from an ordered monolayer. Factors related to use of structural features of the intensity maxima for investigation of atom–surface interaction fields are discussed.
Precipitation during electromigration of ions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecipitation during electromigration of ionsJoris. DemanCite this: Anal. Chem. 1970, 42, 3, 321–324Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021/ac60285a003https://doi.org/1…
Magnetic and Magneto-Optical Properties of Some Rare-Earth and Yttrium Orthochromites
From the magnetic susceptibility measurement on YCrO3 above TN=141°K, two exchange constants J1 and J2 are estimated to be J1=−8.7 cm−1 and J2=−1.0 cm−1. In DyCrO3 weak ferromagnetism is observed along the a axis, with TN=146°K. When temperature goes below 5°K, the direction begins to rotate towards the b axis. In SmC…
Tensile Rupture of Rubber
Abstract The dependence of tensile strength of a number of vulcanizates on temperature has heen studied. A critical temperature θ c is found for natural rubber at which an abrupt change in strength occurs. This temperature depends on degree of crosslinking and also on the nature of the vulcanizing system. The presence…
Magnetic Form Factor ofCo++Ion in Cobaltous Oxide
The van Laar model of the spin structure of CoO in the antiferromagnetic state is supported on the basis of neutron-diffraction data from a single crystal. Then, the magnetic form factor of the ${\mathrm{Co}}^{++}$ ion in CoO is calculated. The anisotropic part of the form factor is studied in detail to arrive at the…
Observation of Dynamic Domain Size Variation in a Silicon-Iron Alloy
It was recently noted that the dynamic domain structure in a ferromagnetic material may differ markedly from that observed under static conditions. In this investigation the dynamic size of magnetic domains in a rectangular single-crystal specimen of an iron-3% silicon alloy (2.5 cm×3.3 cm×0.22 mm with a (001) [100] o…
Lethal Effects of Electric Current on Escherichia coli
An attempt has been made to use low-voltage alternating current to kill microorganisms such as Escherichia coli. The bactericidal effect depends on the energy passing through the suspension and on the time during which the cells are left standing in the medium after the treatment. Most of the toxicity is due to an ind…
Instability of the Motion of a Pulsating Bubble in a Sound Field
This paper describes two related instabilities of spherical bubbles that are set into pulsation by a sound field. One instability is the observed onset of erratic dancing by bubbles that are trapped in a standing wave. This instability occurs when the sound-pressure amplitude exceeds a threshold value, and we measured…
Photochromic spiropyrans. I. Absorption spectra and evaluation of the .pi.-electron orthogonality of the constituent halves
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic spiropyrans. I. Absorption spectra and evaluation of the .pi.-electron orthogonality of the constituent halvesNorris W. Tyer Jr. and Ralph Sherman BeckerCite this: J. Am. Chem. Soc. 1970, 92, 5, 1289–1294Publication Date (Print):March 1, 1970Publication History…
Effect of TiO 2 on Initial Sintering of Al 2 O 3
Alpha alumina with additions of TiO 2 sintered more rapidly than “pure” alumina. The rate of initial sintering increased approximately exponentially with titania concentration up to a percentage beyond which the rate of sintering remained approximately constant or decreased slightly with additional titania. The concen…
Heteropoly blues. IV. Spectroscopic and magnetic properties of some reduced polytungstates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly blues. IV. Spectroscopic and magnetic properties of some reduced polytungstatesGideon M. Varga Jr., Elias Papaconstantinou, and Michael T. PopeCite this: Inorg. Chem. 1970, 9, 3, 662–667Publication Date (Print):March 1, 1970Publication History Published online1 Ma…
Structure of porphyrins and metalloporphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructure of porphyrins and metalloporphyrinsEverly B. FleischerCite this: Acc. Chem. Res. 1970, 3, 3, 105–112Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021/ar50027a004https://doi…
Désordre linéaire dans les cristaux (cas du silicium, du quartz, et des pérovskites ferroélectriques)
Many crystals produce a diffuse scattering of X-rays which is localized in a series of relplanes. It is shown that the corresponding linear disorder in the crystal may have various origins. In silicon, the scattering is due to thermal vibrations and is well explained by the elastic properties of the crystal. In neutro…
Characteristics of the Trochoidal Electron Monochromator
An electron monochromator for use in an axial magnetic field is described. Electrons are injected parallel to the magnetic field and an electric field is applied in a perpendicular direction. The electrons thus describe trochoids and drift in a direction perpendicular to both the electric and magnetic fields and dispe…