Materials Literature
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In this paper, we present a detailed study of the concentration and temperature dependences of the quantum efficiency of energy transfer between Ce3+ and Tb3+ in La1−x−yCexTbyPO4. The determination of the transfer quantum efficiency in terms of the donor luminescence lifetimes is critically compared with that in terms…
Ferroelectrics in which the phase transition parameter is not the polarization are discussed from a phenomenological point of view. The concept of improper, pseudo proper and triggered ferroelectric phase transitions is introduced and compared with Aizu's concept of full, partial and faint ferroelectrics. Dielectric,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared studies of apatites. II. Preparation of normal and isotopically substituted calcium, strontium, and barium hydroxyapatites and spectra-structure-composition correlationsB. O. FowlerCite this: Inorg. Chem. 1974, 13, 1, 207–214Publication Date (Print):January 1, 1974P…
The steady-state flow method has been widely used in the kinetic study of heterogeneous catalysis. Under the conditions of steady state, all elementary steps in series are progressing at the same rate and hence the measured rates hardly tell the precise kinetic structure, or mechanism, of catalytic reactions which usu…
Treatment of RO3SC6H4Me-4 with R1MgBr in THF over Li2CuCl4 at -78 Deg with slowly raising the temp. to room temp. gave, in good yields, the derivs. RR1 (R = e.g. Et, Ph, cyclohexyl, or octyl; R1 = Et, CMe3, Ph, cyclohexyl). [on SciFinder (R)]
Analogies between grain boundaries in metals and nonmetals, direct observations of grain‐boundary characteristics, and inferences about the atomic structure of grain boundaries are reviewed. The electrostatic potential and associated space charge are discussed, and new experimental measurements showing the existence a…
A revision in preparation technique for non-coated scanning electron microscope specimens is reported. Use of arginine hydrochloride, glycine, sodium glutamate and sucrose before treatment with tannic acid markedly enhanced the osmium staining of biological specimens and enabled direct scanning electron microscope obs…
Abstract not Available.
An analysis of the evolution of microstructure during deformation is made and the relationship between the microstructure and annealing texture development considered in detail. Although existing data are inadequate for a full assessment, it seems that all annealing texture components encountered in single-phase cubic…
Basic principles of catalysis adsorption on solid surfaces chemisorption at metal surfaces chemisorption at oxide surfaces kinetics of catalysed reactions quantitative aspects of catalysis by metals heterogeneous catalysis: structure, preparation, and use catalysis in energy conversion and in the production of hydroca…
The application of three branches of electron spectroscopy to surface studies, with particular emphasis on submonolayer chemisorption systems, is reviewed. The three branches are x-ray photoelectron spectroscopy (XPS), vacuum uv photoelectron spectroscopy (UPS), and Auger electron spectroscopy (AES). Each technique is…
A theoretical and experimental study of the application of x-ray-photoelectron angular distribution measurements to quantitative surface characterizations is presented. The basic theoretical model that has been used previously to analyze such angular distributions from flat surfaces in the absence of electron-diffract…
One micron-thick sections of tissues fixed in glutaraldehyde, or in glutaraldehyde followed by osmium tetroxide, and embedded in a variety of plastic resins were stained in a methylene blue-azure II solution at 65 C, then counterstained in 0.05% basic fuchsin in 2.5% ethanol at room temperature (24 C). Considerable va…
Abstract
The adsorption of lanthanum, dysprosium, holmium, and ytterbium on kaolinite, illite and smectite has been studied. The kaolinitic and illitic materials discriminate well between the rare earths, and indicate that there is a gradual increase in adsorption-strength from lanthanum to ytterbium. This corresponds to the v…
Experimental measurements and model interpretations are given for properties of hot-pressed PZT-5 specimens with grain sizes from ∼2 to 5 μm. The dielectric and piezoelectric parameters are studied as functions of temperature, of hydrostatic pressure up to 2800 kg cm−2, of grain size and of the poling history, using a…
The thermal conductivity of thin films of copper (400–8000 Å) has been measured in the temperature range 100–500 K. It decreases with decreasing film thickness. An electrical-thermal transport analogy has been used to calculate the size-dependent thermal conductivity of the thin copper films. The decrease of the therm…
Abstract : This report presents and discusses the available data and information on the thermal conductivity of the elements and contains the recommended reference values resulting from critical evaluation, analysis and synthesis of the available data and information. It also gives estimated values, at least for norma…
A glass plate covered with an evaporated silver layer of about 200 Å thickness is irradiated by a line-shaped electron probe in a vacuum of 10−4 Torr. A layer of polymerized hydrocarbon of very low electrical conductivity is formed at places subjected to high electron current density. An electrolytically deposited cop…
Research Article| September 01, 1974 Chlorine, Sulfur, and Water in Magmas and Oceans A. T. ANDERSON A. T. ANDERSON 1Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637 Search for other works by this author on: GSW Google Scholar Author and Article Information A. T. ANDERSON 1Department…