Materials Literature
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Abstract Plane-wave pseudopotential total energy calculations have been applied to investigate the structure and energetics of the Cs/K exchange into interlayer sites in muscovite mica. Novel muscovite structures were designed to isolate the effects of 2:1 layer charge, cation size/interlayer site shape, and tetrahedr…
4,4′-Methylenebis(2-tert-butylaniline) was synthesized and reacted with pyromellitic dianhydride to produce a polyimide that showed excellent solubility in conventional organic solvents. Solutions of this polyimide could be cast into transparent, flexible and tough films. The number-average molecular weight, as determ…
Abstract The mineral and chemical composition of green glauconitic grains from ODP Site 959 (2100 m water depth) located on the northern flank of the Ivory Coast—Ghana Marginal Ridge was studied. Recurrent winnowing of a 20 m thick Pleistocene succession resulted in a low accumulation rate and stratigraphic hiatuses.…
Abstract Experimental alteration of a rhyolitic obsidian by solutions containing variable concentrations of Mg was carried out at 100, 150 and 200 ° C, for 30, 60 and 90 days, to investigate the mechanism of smectite formation. The smectite exhibits two distinct morphologies: (1) small flakes (aggregates of a few crys…
The pressure dependence of the glass transition temperature (T g ) has been estimated from the pressure effect on the activation energy of electric conductivity in alkaline (albite, haplogranite), alkaline earth (anorthite) silicate and SiO 2 glasses. The dc conductivity (σ) has been determined from the electrical imp…
Two types of lanthanum based chromite-titanate perovskite materials have been tested for use as porous ceramic anodes in SOFC applications. The calcium- or strontium- doped chromium-rich materials, with composition La0.7A0.3Cr0.8Ti0.2O3–δ (A = Ca, Sr), showed p-type conductivity under reducing conditions. The titanium…
Er 3+ – Y 3+ codoped TiO2 films were prepared on a fused silica substrate by the sol–gel process. The effect of Y3+ codoping on the ∼1.54 μm photoluminescence (PL) properties of Er3+-doped TiO2 films are investigated. Enhancement of PL properties due to Y3+ codoping by a factor of 10 for intensity and of 1.5 for the f…
Nanocrystalline α‐Al 2 O 3 powders have been prepared by pyrolysis of a complex compound of aluminum with triethanolamine (TEA). The soluble metal‐ion–TEA complex forms the precursor material on complete dehydration of the complex of aluminum‐TEA. The single‐phase α‐Al 2 O 3 powder has resulted after heat treatment at…
Abstract Biocomposites are prepared from a cheap, renewable natural fiber, coir (coconut fiber) as reinforcement with a biodegradable polyester amide (BAK 1095) matrix. In order to have better fiber‐matrix interaction the fibers are surface modified through alkali treatment, cyanoethylation, bleaching and vinyl grafti…
Materials that exhibit considerable electronic conductivity and good stability in fuel atmospheres are interesting candidates to replace of Ni in its current collecting role in Ni-cermet solid oxide fuel cell (SOFC) anodes. The Nb1-xTixO2 rutile system offers particularly high electronic conductivity and has good chem…
Nowadays there is much interest in thin polymer \nfilms due to their importance in science and technology. \nStudies on Tg in thin polymer films have revealed that \nit is dependent on film thickness and that such dependence \nincreases with decreasing film thickness. As \nfor the case where the in…
The processing conditions, microstructure, and dielectric properties of strontium bismuth niobate vanadate ceramics, SrBi 2 (V x Nb 1− x ) 2 O 9 (SBVN, with 0 ≤ x ≤ 0.3), were systematically studied. A relative density of >90% was obtained for all the samples using a two‐step sintering process. XRD showed that a si…
Laminates consisting of two different nanocrystalline zirconia materials (undoped and 3Y‐TZP doped) were sintered, and their densification and curvature were quantified using optical dilatometry. The experimental results agreed well with a continuum‐mechanical description for the cosintering of laminates with diffusio…
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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 V. Yu. Zerov and V. G. Malyarov , "Heat-sensitive materials for uncooled microbolometer arrays," J. Opt. Technol. 68, 939- (2001) Export Citation BibTe…
Avian eggshells are natural composite bioceramics containing organic and inorganic phases. The occurrence and role of particular collagens and proteoglycans in the eggshell and their pattern of secretion by the oviduct is discussed. While type X collagen, the main constituent of the shell membranes, functions to inhib…
We have systematically investigated the effect of anharmonicity on the equilibrium properties of systems with a complex potential energy surface. Anharmonicities are modeled by the temperature dependence of the harmonic frequencies {νi} near a stationary point of the PES. The low-temperature behavior is described by a…
A new coupled bipyridinium-based dye system showing excellent daylight, long term, and cycle stability is presented here. Cells with the coupled system show a stable switching performance for more than 4000 h. Deliberate matching of the counter anion/dye system with the solution allows compensation of the density chan…
Using a serial bilayer model we show that heterogeneous ferroelectric systems may exhibit substantial Maxwell–Wagner piezoelectric relaxation. The relaxation has its origin in the coupling of the dielectric and piezoelectric properties. The model predicts both retardation (positive phase angle and counterclockwise cha…
In the last two decades, progress has been made in the modification of the properties of clay materials in order to produce new clay nanocomposite products that can be used for controlling soil environmental quality. Pillared organoclays and nanocomposites constitute a novel class of materials, prepared by propping ap…