Materials Literature
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Dielectric properties of pure, unsintered and pressed barium titanate were investigated. The initial nonlinear variation of dielectric constant and dissipation factor with temperature observed is attributed to the water vapor adsorbed on the surface exposed to the pores. The absence of ferroelectric properties and the…
Abstract Für die Bildung von β‐FeOOH ist die Anwesenheit von Chlorid‐ oder Fluoridionen Voraussetzung. Diese können in Form der entsprechenden Säuren oder auch von Salzen vorliegen. Schon bei An‐ wesenheit kleinster Chloridmengen entsteht dabei β‐FeOOH, z. B. auch unter Lochfraßbedingungen, wobei FeCl 2 ·4H 2 O entste…
Temperature effects on the phosphorescence lifetimes and phosphorescence intensities of naphthalene, phenanthrene, pyrene, biphenyl, and the perdeuterated analogs of these four molecules were measured with the use of poly(methylmethacrylate) (PMM) as a rigid solvent matrix. The phosphorescence lifetimes of these molec…
The velocity field and hence stress field for two-dimensional large-amplitude folding of a viscous layer in a less viscous matrix has been determined theoretically by a series of linear incremental problems. The velocity field for each problem was found numerically using a modification of the finite element method. Th…
A range of 27 marine phytoplankton species, representative of several of the principal classes, has been grown under similar conditions in Erd-Schreiber medium with abundant nutrients. Harvesting was carried out 20 days after inoculation while vigorous growth was proceeding. The component fatty acids of the lipids ext…
SYNOPSIS. Uloborus diversus adjusts its behavior while laying sticky spiral in response to stimuli it receives as it moves. The course of the last loop of sticky spiral determines the path the spider takes. The spiders probably sense the angles the sticky spiral makes with the radius and with the last loop of spiral,…
The propagation of microwave magnetoelastic waves in a ferromagnet subjected to pulsed magnetic fields is investigated. In the first part of the theoretical analysis, which is restricted to spatially uniform bias fields, the interaction between the magnetic and elastic systems is neglected. Using a coupled-mode approa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Crystal Breakage on Crystal Size Distribution in Mixed Suspension CrystallizerA. D. RandolphCite this: Ind. Eng. Chem. Fundamen. 1969, 8, 1, 58–63Publication Date (Print):February 1, 1969Publication History Published online1 May 2002Published inissue 1 February 196…
The resistivity and Hall effect of single crystals of the two-layer structure of NbSe2 were measured from about 5° to 300°K. A sign change was observed in the Hall coefficient at about 26°K; above this temperature the samples were p type, and below, n type.
A simple scanning microscope has been built which uses a field emission electron gun alone, without the aid of auxiliary lenses. The design and operation of the microscope are described and the calculated performance is compared with experiment. Resolution of 100 Å has been obtained and is shown in transmission electr…
The process of electromigration in thin Al films was studied directly by transmission electron microscopy during passage of current. Due to electromigration, the Al ions migrate along the test strip from cathode to anode, and the actual opening up of holes near the cathode was observed. The rate of hole formation was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariation of the lattice parameter with aluminum content in synthetic sodium faujasites. Evidence for ordering of the framework ionsEdward Dempsey, G. H. Kuehl, and David H. OlsonCite this: J. Phys. Chem. 1969, 73, 2, 387–390Publication Date (Print):February 1, 1969Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRare earth dioxymonocarbonates and their decompositionRheal P. Turcotte, James O. Sawyer, and LeRoy EyringCite this: Inorg. Chem. 1969, 8, 2, 238–246Publication Date (Print):February 1, 1969Publication History Published online1 May 2002Published inissue 1 February 1969https:…
Using the common polarization-potential tensors and the common refractive-index-dispersion parameter which characterize the electro-optical and nonlinear optical properties of all oxygen-octahedra ferroelectrics, we analyze in detail the device behavior of electro-optic modulators, light deflectors, and optical second…
The problem of averaging fourth-rank tensors with texture describing weight functions has been solved for orthotropic physical symmetry and for orthorhombic crystal symmetry. The results are presented in tabular form. The procedure for extending the tabular results to tetragonal, hexagonal, and cubic crystal symmetrie…
Measurements of neutron scattering from an SrTiO 3 crystal have been carried out in the temperature range from 4.5°K to 300°K. The integrated intensity of inelastically scattered neutrons due to excitation of the soft optical phonon was observed at various reciprocal lattice points at room temperature. The structure f…
Neutron diffraction patterns for vitreous germania, synthetic vitreous silica and radiation-damaged synthetic silica have been obtained to 18 Å -1 . With the use of a special resolution function the results have been analysed to produce `radial distribution functions' free of truncation error ripples. The function for…
A microscopic tensor theory of the electro-optical and nonlinear optical effects in oxygen-octahedra ferroelectrics is presented. The theory stresses the importance of the basic BO6 octahedron building block in this class of materials. This common structural unit leads to similarities in band structure and similaritie…
Reflectivity measurements on dilute gold-iron alloys by a new method are reported. There is clear evidence that the band gaps change steadily on alloying. In the region 3 to 6 eV additional absorption growing nonlinearly with concentration suggests that the impurities are interacting with each other.
Crystals of CdGeO(3) grown at a pressure of 65 kilobars are tetragonal and have an ordered, garnet-like crystal structure with cadmium occupying the dodecahedral and octahedral sites, and germanium the octahedral and tetrahedral sites. The crystal structure (a = 12.406 +/- 1 angstroms, c = 12.256 +/- 1 angstroms, and…