Materials Literature
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The least-squares strain is computed from calcite twin lamellae in cylinders of Indiana limestone experimentally shortened from 0 to 8.5 percent at 1.0-kb confining pressure, room temperature, and a constant strain rate of 10 −4 /sec. The best fit to the experimental results is obtained by using the inner width of the…
The weight gains of Al specimens immersed for short times in water at 50°–70°C were measured. An analysis of these data and published results at other temperatures indicated that the kinetics of pseudoboehmite film growth in the temperature range 50°–100°C is determined initially by the nucleation and growth of hydrol…
The dependence of the melting temperature of starch on its concentration in a polymerdiluent mixture was determined. The resultant data were analysed by application of the thermodynamic equations appropriate to a first-order phase transition. It is suggested that this analysis may be used to explain certain features o…
Thin foils of an ‘ experimental ’ austenitic stainless steel, with and without dispersions of aluminium oxide particles, are irradiated with 1 MeV electrons in a High Voltage Electron Microscope at 600°C. Evidence of grain size dependent void nucleation, void concentration, and void volume swelling are presented for g…
X-Ray photoelectron spectra of a variety of uranium oxides have been studied and compared with the spectrum obtained from the pure metal. The oxide phases studied were UO2·0, UO2·1, UO2·2, U4O9, U3O7, U3O8, and γ-UO3 where the formal oxidation number of uranium alters from IV to VI. Significant chemical shifts observe…
The Langmuir method for measurement of vapour pressures has been tested for use in studies of decomposition reactions. The isothermal weight loss in vacuum from cleavage (10text-decoration:overline11) planes of calcite (CaCO3) single crystals was measured continuously at temperatures from 934 to 1013 K. The rate was c…
An equidimensional single crystal of Fe2(CO)9 has been used to reinvestigate the molecular structure. The results confirm all the main qualitative features originally reported by Powell and Ewens, and provide the level of accuracy needed for comparison with other structures and for molecular orbital calculations. The…
Magnetic circular dichroism spectroscopy has been used to investigate the assignment of the charge transfer bands in a number of metal phthalocyanines containing first row transition metals. It has been shown that the band in cobalt(III) phthalocyanine dicyanide at 22.5 kK is not a charge transfer band but must be a t…
Adhesion is of vital interest in thin-film science because the fragile film relies on the underlying substrate, and the adhesion between the two for durability. In addition, the formation and structure of the film depend on the adhesive interaction between the depositing material and the substrate. Despite its general…
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…
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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…