Materials Literature
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Abstract Vermiculitization of mica is one of the main weathering processes in soils from three upland catchments receiving various levels of acid deposition. Usually this process is manifested by the presence of interstratified mica-vermiculite with the interlayer space in the vermiculite often partially filled with p…
Ferroelectric (FE) thin-film capacitors are irradiated to 100 Mrad(Si) with 10-keV X-rays. Some of the FE hysteresis loops show distortion at 5 Mrad(Si). The type and degree of distortion are dependent on the polarization state and/or the applied field during irradiation. Preliminary results indicate that a fraction o…
Polarized Raman spectra of uranium dioxide single crystals were recorded with the use of a Raman microprobe. Results showed a peak at 448 cm −1 , having only off-diagonal tensor elements, which was assigned to the T 2 g zone center phonon. There was also a broad peak at 1156 cm −1 , which was ascribed to electronic Ra…
Abstract In this paper a new class of oriented polymers is introduced: highly crosslinked polymer networks obtained by photopolymerization of oriented liquid crystalline (LC) monomers. Orientation of these monomers can be induced in the same manner as usual for conventional LCs applied in LCDs: with the aid of an elec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe "anomalous" basicity of P(NHCH2CH2)3N relative to P(NMeCH2CH2)3N and p(NBzCH2CH2)3N: a chemical consequence of orbital charge balance?M. A. H. Laramay and John G. VerkadeCite this: J. Am. Chem. Soc. 1990, 112, 25, 9421–9422Publication Date (Print):December 1, 1990Publica…
The radiation hardness of thin-film PbZr/sub y/Ti/sub 1-y/O/sub 3/ (PZT) ferroelectric capacitors is explored. Ferroelectric capacitors were irradiated using X-ray and Co-60 sources to dose levels up to 16 Mrad(Si). The capacitors were characterized for their memory properties both before and after irradiation. The ra…
Two definitions of profile agreement indices are now in common use for estimating the degree of fit in Rietveld refinement and in structure-independent pattern-fitting methods of powder diffraction analysis. In the original program written by Rietveld, the background was subtracted and the `non-peak' regions of the pa…
The concentration of single nitrogen atoms in type Ib synthetic diamond has been measured, by electron paramagnetic resonance and by inert-gas fusion, as a function of the strength of the infrared absorption produced by these centres. The two methods yield, in good agreement, values of 22·0 ±.1·1 at. p.p.m. and 20·6±1…
Adsorption of hard spherical particles onto a flat uniform surface is analyzed by using generalized random sequential adsorption (RSA) models. These models are defined by releasing the condition of immobility present in the usual RSA rules to allow for desorption or surface diffusion. Contrary to the simple RSA case,…
Ferroelectric materials show a spontaneous electrical polarization that can be reversed in sense by an applied external electric field. It should, therefore, be feasible to build a ferroelectric memory device that can store information in digital form. Early attempts to build such a memory have failed for various reas…
Similarities in the inhibition of crevice corrosion and pitting can be explained on the basis of competitive adsorption between inhibitive and aggressive ions. A mathematical model has been developed which takes into account competitive adsorption between aggressive ions (Cl − ) and inhibitive ions , with each ion ads…
Abstract Single-crystal Fourier-transform infrared (FTIR) spectra of Keokuk kaolinite and Ouray dickite were obtained with an FTIR microscope. Although numerous IR, FTIR, and Raman spectra of polycrystalline kaolinite and dickite can be found in the literature, the present data represent the first reported single-crys…
We give a comprehensive presentation of a renormalization-group theory for the study of a set of one-dimensional Schr\"odinger equations on quasicrystalline and hierarchical structures. Particular attention is focused on the spectral clustering and wave-function scaling properties. New results are given on (i) a gener…
Abstract A crystallization rate coefficient (CRC) parameter is introduced which has allowed a direct comparison of the crystallization rates of various polymers on a single scale for the first time. Basically, CRC represents a change in cooling rate required to bring about 1°C change in the supercooling of the polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear quadrupole interactions in copper(II)-diethylenetriamine-substituted imidazole complexes and in copper(II) proteinsFeng Jiang, John McCracken, and Jack PeisachCite this: J. Am. Chem. Soc. 1990, 112, 25, 9035–9044Publication Date (Print):December 1, 1990Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous colloidal dispersions of polyaniline formed by using poly(vinylpyridine)-based steric stabilizersS. P. Armes, M. Aldissi, S. Agnew, and S. GottesfeldCite this: Langmuir 1990, 6, 12, 1745–1749Publication Date (Print):December 1, 1990Publication History Published onlin…
Shape memory alloy hybrid composites have been shown both by analytical simulations and experiments to be effective adaptive materials for active vibration and structural acoustics control [Rogers and Robertshaw, Engineering Science Preprints 25, ESP25.88027, Society of Engineering Sciences (1988) and ASME Paper 88-WA…
Pure BaTiO 3 exhibits a paraelectric‐to‐ferroelectric phase transition at 130°C. When stoichiometric BaTiO 3 is combined with 10 mol% ZrO 2 , the relative permittivity (ε) changes to a broad, relatively insignificant temperature dependence, and the Curie point, T c , is not sharply defined. However, the transition sha…
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Polarized reflection and ESR measurements have been carried out on single crystals of newly synthesized halogen-bridged one-dimensional (1D) metal complexes {M(chxn${)}_{2}$Br}${\mathrm{Br}}_{2}$ (M=Pt, Pd, Ni; chxn=1R,2R-cyclohexanediamine), which have tight hydrogen bonds between ligands (chxn) and counter anions ($…