Materials Literature
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Abstract Chromocene deposited on silica supports of high surface area forms a highly active catalyst for polymerization of ethylene. Polymerization is believed to occur by a coordinated anionic mechanism previously outlined. The catalyst formation step liberates cyclopentadiene and leads to a new divalent chromium spe…
The dynamics of order-disorder-type ferroelectrics and anti-ferroelectrics is discussed with reference to recent theoretical and experimental investigations. Following a short review of the lattice dynamical theory of structural phase transitions the pseudo-spin formalism appropriate for order-disorder-type systems is…
Introduction Stress corrosion cracking is a phenomenon that is of interest to a wide range of metal users. When it occurs under service conditions, often without any prior indication of impeding failure, its effect may be catastrophic.
X-ray scattering intensities from unoriented samples of cholesteryl nonanoate and myristate are reported for several temperatures in the smectic $A$, cholesteric, and isotropic liquid phases. The measured Bragg-scattering intensities from the smectic planes are used to test a recent theoretical model of the smectic $A…
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The intermetallic phases formed between the rare earth metals (R) and the elements of the 3-d transition series are a large group of new substances with interesting magnetic properties. They have been studied intensely in the last decade. Their properties are reviewed with a view toward their usefulness for permanent…
The author describes how the effect is being employed in several laboratories to obtain information about the momenta of electrons in solids and asserts that the information obtained is fundamental to the understanding of their basic physical and chemical properties.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric properties and relaxation in ethylene carbonate and propylene carbonateRichard Payne and Ignatius E. TheodorouCite this: J. Phys. Chem. 1972, 76, 20, 2892–2900Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue…
A simple technique is described for the preparation of collagen substrata containing 0 1% of collagen by weight, in the form of native bundles with a 640 A period, the substrata are similar in these respects to soft-tissue matrices These substrate are hydrated collagen lattices (HCLs) in which the watery milieu is hel…
The review was written by JJ.Bikerman specially for Uspekhi Khimii. Bikerman is one of the leading U.S. specialists in the theory and practical aspects of surface phenomena and adhesion in polymers and solids and therefore the presentation of his views on the nature and strength of adhesive joints is of very considera…
The optical fluorescence of ten trivalent lanthanide ions, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm in Y2O2S, La2O2S, and Gd2O2S have been measured by X-ray excitation at 300 K. Some lines of Eu3+, Gd3+, and Tb3+ in La2O2S at short wavelengths were found to be quenched at 300 K. La2O2S appeared to be a more efficien…
A systematic investigation, performed on some fifty single crystals, between −40 and 250 °C shows that the values of the bulk resistivity ϱv (20 °C) range from 103 to 1013 Ωcm and that the activation energies lie between 0.1 and 1 eV. These values depend on the conditions of the cooling after oxydation and of high vac…