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A previously described model for exchange interaction is applied to the study of antiferromagnetic coupling in binuclear oxo-bridged iron (III) complexes. The energies of the magnetic orbitals (singly occupied d orbitals of each transition ion, partially delocalized towards the ligands surrounding this ion), and of th…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Paul W. Palmberg; Quantitative Auger electron spectroscopy using elemental sensitivity factors. J…
Whereas the symmetry of the order parameter is specified by operations preserved at the transition, domains are determined by lost symmetry operations. The number and the relations between domains and domain pairs can be found by grouping the lost operations into left and double cosets. Different types of domains, rot…
The pressure dependence of helium (at 25 °C) and neon (at 150 °C) solubility in vitreous silica has been measured at pressures up to 1400 atm. Results appear to be readily explained by a simple statistical thermodynamical model based on the Langmuir adsorption model. Values for the accessible free volume of the glass…
A survey of hydrogen degradation problems in energy related systems is presented. Nine separate phenomenological classifications of such degradation are presented. Key areas of unsolved problems and needed research are specified. Hydrogen embrittlement mechanisms and hydrogen attack in particular, are pinpointed as cr…
In CuY zeolites degassed at temperatures above 650 K cupric ions are reduced to some extent to cuprous ions.Evidence for this process of auto-reduction was taken from the decrease in weight of the sample, and the detection of a desorbing gas in a volumetric system. The latter was identified as oxygen. U.v. reflectance…
One of the goals of modern polymer research is to achieve an understanding in rigorous and quantitative terms of the molecular chain configuration and of the spatial arrangement of the polymer molecules in the solid state. This problem is of particular interest for oriented semicrystalline polymers such as textile fib…
The dynamic mechanical properties of glassy polymers, such as atactic polystyrene and poly(ethylene terephthalate), have been followed as a function of the excess enthalpy during isothermal annealing at selected temperatures below their respective glass transition temperatures. For glassy polymers prepared from crysta…
The permittivity, refractive index, molecular dipole moment, dielectric relaxation parameters and molecular Kerr constant are reported for the nematogen 4,4-n-heptyl-cyanobiphenyl (HCB) in the nematic phase, in the pure isotropic phase and in benzene solutions. The anisotropy of molecular polarizability is less than i…
Phase transitions in vanadyl phthalocyanine have been studied using differential scanning calorimetry, x-ray scattering and optical absorption spectroscopy. Three phases, I, II and III, were prepared by nonequilibrium vapour quenching, equilibrium crystal growth and melt quenching, respectively. Phase I is metastable…
The consumption of hydrogen over Ag+-Y and of oxygen over Ag°-Y zeolites was followed kinetically. I.r. spectroscopy and X-ray spectrometry were used to characterize the products obtained.The results revealed the presence of a high and a low temperature reduction mechanism. Quantitative reduction of the Ag+ ions requi…
The chemisorption of CO on the (111) surface of Ir at room temperature and below has been investigated using both low-energy electron diffraction (LEED) and thermal desorption mass spectrometry. The CO is adsorbed rapidly onto the (111) Ir forming a well-ordered (√3×√3) R30° overlayer structure after an exposure of ap…
The memory retention and switching behavior of a metal-ferroelectric-semiconductor transistor using bismuth titanate have been investigated. The study made on p-channel transistors shows that the device has a fast switching speed and a switching threshold at a field of about 15 to 20 kV/cm. It also has a good memory r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShort-Chain and Long-Chain Branching in Low-Density PolyethyleneF. A. Bovey, F. C. Schilling, F. L. McCrackin, and H. L. WagnerCite this: Macromolecules 1976, 9, 1, 76–80Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching of the luminescence of the tris(2,2'-bipyridine) complexes of ruthenium(II) and osmium(II). Kinetic considerations and photogalvanic effectsChin-Tung Lin and Norman SutinCite this: J. Phys. Chem. 1976, 80, 2, 97–105Publication Date (Print):January 1, 1976Publicatio…
While the deliberate copolymerization of various monomers to obtain properties that could not be obtained via homopolymerization has been going on for some 60 years, the effect of copolymerization on some properties has only recently been understood. The effect of copolymerization on the polymer glass transition (Tg)…
J Harding (ed) London and Bristol: The Institute of Physics 1975 pp x + 460 price £15 UK, £16 overseas This volume comprises the proceedings of the conference on mechanical properties at high rates of strain held in Oxford in April 1974 under the auspices of The Institute of Physics. The effect of the rate of strain o…
The generalized Smoluchowski equation is employed to calculate the first two cumulants of decay of the intermediate scattering function for interacting colloidal particles. A model calculation is presented to investigate the behavior of the general form of the cumulants. The hydrodynamic interaction is examined and po…
The bend elastic constants (k 33) and order parameters (S) derived from optical measurements in the nematic phase of pentlyl, hexyl, heptyl and octyl cyanobiphenyls (5CB, 6CB, 7CB and 8CB respectively) are reported. The odd-even effect is clearly seen in the K 33 values of all four compounds and in the S values of the…
Anodic polarization and corrosion cracking behavior of 80 kg/mm2 high strength steel (HT 80) were investigated in liquid ammonia containing ammonium carbonate (saturated-accelerated corrosion cracking environment) or ammonium chloride at 30°C. The results obtained are as follows:(1) Corrosion potential vs Pt electrode…