Materials Literature
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The magnetic properties of all known sulfides, selenides, and tellurides of Pr and Tm (as representative of the light and heavy rare earths, respectively) have been studied. In most cases, Pr and Tm compounds exhibit Van Vleck paramgnetism at low temperatures owing to crystal-field singlet ground states. Splittings ha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConstituent analysis of the potential gradient along a reaction coordinate. Method and an application to methane + tritium reactionKenichi Fukui, Shigeki Kato, and Hiroshi FujimotoCite this: J. Am. Chem. Soc. 1975, 97, 1, 1–7Publication Date (Print):January 1, 1975Publicatio…
The propagation of electromagnetic waves along open periodic, dielectric waveguides is formulated here as a rigorous and exact boundary-value problem. The characteristic field solutions are shown to be of the surface-wave or leaky-wave type, depending on the ratio of periodicity to wavelength (d/lambda). The dispersio…
A new model has been proposed for describing deoxidation kinetics in turbulent melts by /Jostulating that for aluminum deoxidation the coalescence of the inclusion /Jarticles is the mte contloiling mechanism.
The static equilibrium configurations of a dislocation bypassing a periodic row of impenetrable circular obstacles were obtained for various crystals by means of a self-stress method wherein the elastic anisotropy of the crystal and the dislocation self-interaction could be taken into account. A correlation was develo…
Data on the fluorescent yields of tervalent ions of Pr, Sm, Eu, Gd, Tb, Dy, and Tm in H2O and D2O, containing perchlorate ions, and isotope effects on the fluorescence are reported. The results are interpreted in terms of the mechanisms responsible for radiationless processes in solutions of rare earth ions [Y. Haas a…
A substantial fraction of the defects in epitaxial thin films are formed to accommodate part of the misfit between the stress−free lattice parameters of film and substrate. This paper describes some of the complete dislocations, partial dislocations, and cracks that are made for this purpose. Also described are the op…
Since approximately 1950 an increasing portion of experimental solid state physics research has been concerned with studying defects in crystals. This trend might appear to be a rather belated recognition that most of the materials we come into contact with have a random structure. In fact the theoretical understandin…
Earlier observations on the magnitudes of chemical shifts of photoelectron and core-type Auger lines, and the concept of the role of polarizability, have been combined to produce a unified concept of the role of polarization in determining line position. With core-type Auger lines, polarization effects are more import…
The co-operative Jahn-Teller effect is a phase transition which is driven by the interaction between localized orbital electronic states and the crystal lattice. The possible origins, symmetries and properties of the electron-lattice interactions and how they lead to possible hamiltonians for the coupled system are di…
Journal Article The concept of dissolution efficiency Get access K A Khan K A Khan Beecham Pharmaceuticals, Clarendon Road, Worthing, Sussex. Search for other works by this author on: Oxford Academic Google Scholar Journal of Pharmacy and Pharmacology, Volume 27, Issue 1, January 1975, Pages 48–49, https://doi.org/10.…
A general symmetry argument is presented, and experiments on newly synthesized p-decyloxybenzylidene p'-amino 2-methyl butyl cinnamate are described, demonstrating that chiral smectic C and H liquid crystals are ferroelectric. Some of the properties of this new class of ferro-electrics are discussed.
The polarized reflectance of single crystals of tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ) at 300 K is reported over the frequency range 300 to 4000 ${\mathrm{cm}}^{\ensuremath{-}1}$, with unpolarized data extending to 50 ${\mathrm{cm}}^{\ensuremath{-}1}$. A Kramers-Kronig analysis is used to obtain the fr…
The results from soft X-ray appearance potential spectroscopy (SXAPS), photon-induced Auger appearance spectroscopy h(cross) omega -APS), X-ray photoelectron spectroscopy (XPS) and ionization loss investigations on the carbon K level in graphite are compared. It is shown that plasmon excitation accompanies core hole c…
The effect of the grain size on unit-cell dimensions and dielectric properties has been studied in ceramic lanthana-substituted lead titanate of the general composition Pb1−αxLaxTiO3+x (1.5−α) with α = 1.20 and x = 0.07 (PLT7) and x = 0.18 (PLT18). The grain size ranges from 0.6 to 11 μm and the effects are most prono…
The interpolytypic transition from the IT to the 2H modification in the TaS2 system is shown to be a shear transformation. A transformation mechanism is proposed based on partial dislocation movement along successive glide planes. The same mechanism accounts for the observed simultaneous formation of polytypes other t…
Room-temperature pressure studies (3 kbar) on $a$-${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$ reveal that both hole transport, as determined from time-of-flight experiments, and dark dc conductivity increase with hydrostatic pressure as $\mathrm{exp}(\ensuremath{\alpha}p)$, where $\ensuremath{\alpha}\ensuremath{\sim}0.45$…
The properties of real surfaces of (111) single-crystal Cu2O samples, prepared by quenching after equilibration at various oxygen pressures and at a temperature of 750 or 960 °C, were investigated using photoelectric emission, contact potential difference, and electrical conductivity measurements. The measurements yie…
On the base of results from the analysis of known the Judd-Ofelt expression for the line intensities of TR3+ ion spectra, some simple and quite reliable determination methods are given for the luminescent branching ratio connected with the radiative 4F3/2 → 4IJ transition and the redistribution of the intensities betw…
The attempt frequency for ion diffusion in the superionic conductors sodium and silver $\ensuremath{\beta}$-alumina is directly observed as a resonance in the far infrared dielectric response. Correlation of the measured attempt frequency with the observed diffusion coefficient suggests that the best conductors, Na an…