Materials Literature
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New data are given for algodonite (formula), awaruite (formula, space group), billingsleyite (space group, unit cell), bogdanovite (formula, space group), hexatestibiopanickelite (formula), keithconnire (formula), mgriite (formula), polarite (formula), roaldite (space group), sobolevskite (space groups, unit cells), s…
Abstract High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the satur…
Abstract The expandabilities of kaolin-group minerals in different horizons in 10 soils from New Zealand and Fiji were measured immediately after the application of formamide and after the sequential application of hydrazine, water, and glycerol (HWG treatment). The expandabilities of these minerals in some of the soi…
Abstract The verdine facies, previously confused with components of ancient ironstones, has been studied in relation to its distribution, mineralogy, genesis, environment, and geological significance. Several chemically specific components are present including (i) a ferric and magnesian dioctahedral-trioctahedral 1 :…
Abstract not Available.
We describe an experimental study of the effects of various surface treatments on the frictional and tensile properties of cotton and aramid single yams and also on the mechanical properties of fabrics woven from these yams. Lubrication of the yarn or fabric generally reduces those parameters that quantitatively descr…
The dissolution rate of sapphire into CaO‐MgO‐Al 2 O 3 ‐SiO 2 (CMAS) melts was investigated at 1450° and 1550°C. The effects of immersion time, specimen rotation rate, and magnesia concentration in the bulk melt on the sapphire dissolution rate and on the growth rate of magnesium aluminate spinel at the sapphire/melt…
Abstract Melt strength data are presented on the three major classes of commercial polyethylenes (LDPE, LLDPE and HDPE). The LDPE samples studied were polymerised by both tubular and autoclave reactor technology and the LLDPE samples were produced with different α-olefins as comonomer. Melt strength was assessed from…
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…