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The electrical conductivity and Seebeck coefficients of La 1‐x Sr x FeO 3 ( x =0.1, 0.25) were measured as a function of oxygen partial pressure, P O2 , at T =900° to 1300°C. The electrical conduction was p type in the higher P O2 range, and n type in the lower P O2 range. The Seebeck coefficient indicated that the co…
Abstract Infrared absorption and polarized Raman spectra of rare‐earth titanates of pyrochlore structure Ln 2 Ti 2 O 7 (Ln = Sm, Gd, Yb; Y) and Ln 2 Sn 2 O 7 (Ln = La, Sm, Gd, Yb, Lu; Y) have been recorded. A valence force field calculation clearly supports the assignment of the frequencies. A comparison of the result…
Anodic oxidation of Ru and electrodes in has been investigated using x‐ray photoelectron spectroscopy. During evolution on Ru a highly defective hydrated oxide film is formed as a result of corrosion. At a temperature of 310°C in vacuum this film decomposes to metallic ruthenium. The surface of anodes prepared by ther…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical studies of some conducting polythiophene filmsRobert J. Waltman, Joachim Bargon, and A. F. DiazCite this: J. Phys. Chem. 1983, 87, 8, 1459–1463Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 April 1983ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRuthenium tetraoxide staining of polymers for electron microscopyJohn S. Trent, Jeny I. Scheinbeim, and Peter R. CouchmanCite this: Macromolecules 1983, 16, 4, 589–598Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 Apri…
The mechanical strength of most glasses and ceramics decreases with time under static loading in an ambient environment. This strength loss is associated with slow growth of preexisting surface flaws due to stress corrosion by water from the surrounding environment. We studied stress corrosion in vitreous silica expos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical effects of ultrasound on aqueous solutions. Formation of hydroxyl radicals and hydrogen atomsKeisuke Makino, Magdi M. Mossoba, and Peter RieszCite this: J. Phys. Chem. 1983, 87, 8, 1369–1377Publication Date (Print):April 1, 1983Publication History Published online1…
At pH 5.4 apotransferrin (iron-free transferrin) binds to cell-surface transferrin receptors to the same extent and with the same affinity as does diferric transferrin at pH 7.0. Apotransferrin is quickly dissociated from its receptor when the pH is raised to 7.0. These and other results strongly support a simple mode…
Optical fibres consisting of Al2O3-SiO2 and Al2O3-P2O5-SiO2 cores have been fabricated by MCVD with a minimum attenuation of 0.7 dB/km at 1.6 μm. Both single-mode and multimode fibres were produced, the latter with a numerical aperture as high as 0.29. The tendency for Al2O3-SiO2 glasses produced by flame hydrolysis p…
Supercooled liquids and metallic glasses can be viewed as defected states of bond orientational order. Surfaces of constant negative curvature contain an irreducible density of point disclinations in a hexatic order parameter. Analogous defect lines in an icosahedral order parameter appear in three-dimensional flat sp…
Electrodynamic calculations of the electric field on the surface of large Ag prolate spheroids indicate that the field enhancement decreases rapidly, the resonance shifts to longer wavelengths and broadens, and a new set of higher-order resonances appears at shorter wavelengths. These results form the basis for compar…
Abstract The results of atomistic calculations of long-period tilt boundaries, which were reported in the preceding parts I and II, are generalized and represented concisely by using two-dimensional lattices, called decomposition lattices. The basis vectors of a decomposition lattice characterize the two fundamental s…
Abstract The results of the study of symmetrical tilt boundaries, reported in the preceding part I, are generalized to asymmetrical tilt boundaries. A classification of tilt boundaries in cubic crystals is developed that reveals which boundaries to choose in order to study equilibrium faceting or intrinsic grain bound…
Abstract An atomistic study of tilt grain boundary structures in f.c.c. metals has been made. The principal aim of this study is to understand the structure of long-period (‘general’) tilt boundaries. Boundaries for which Σ< 491 were considered, where Σ is the reciprocal density of coincidence sites. The work i…
The disorder formation in quartz crystals by implantation of He+, B+, and Ar+ ions at room temperature is investigated by Rutherford-backscattering spectrometry (RBS). The efficiency of the process of damage production is strongly dependent on the energy deposition mechanism and the degree of disorder. Three character…
The effective threshold energy for atom displacement is measured in molybdenum single crystals in a high-voltage electron microscope. Displacement is monitored at 70 K ≦ T ≦ 300 K by observing the nucleation of interstitial dislocation loops, and at 500 K ≦ T ≦ 800 K by measuring the growth rate of previously induced…
An experimental and theoretical study of nonlinear acoustic propagation in a typical glass, fused silica, is presented, at frequencies near 1 GHz and temperatures below 1 K. The data are interpreted within a general framework of pulse propagation in an inhomogeneously broadened two-level absorber. Numerical solutions…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Craig F. Bohren and Timothy J. Nevitt, "Absorption by a sphere: a simple approximation," Appl. Opt. 22, 774-775 (1983) Export Citation BibTex Endnote (…
High-field magnetoresistance measurements are shown to provide a sensitive characterization technique for graphite fibers with such a high degree of crystalline perfection that conventional characterization techniques are insensitive, including x-ray linewidth measurements, intensity of disorder-induced features in th…
We report here a Monte Carlo study of the thermodynamic and structural properties of a two-dimensional system of 2500 particles interacting by a repulsive inverse sixth power potential. Particular effort was made in the melting region, both to identify the defect structures and to ascertain the thermodynamic changes a…