Materials Literature
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We present experimental results of the temperature and magnetic-field dependences of the colossal magnetoresistance (CMR) and the magnetization in a series of ceramic samples with composition (${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Y}}_{\mathit{x}}$${)}_{2/3}$${\mathrm{Ca}}_{1/3}$${\mathrm{MnO}}…
Fluctuations in the number of colloid particles adsorbed irreversibly under diffusion and flow were determined. The experimental measurements were carried out in the impinging-jet cells using as model colloids the monodisperse polystyrene latex particles of micrometer size range adsorbing at mica sheets. The surface c…
An analytical study was performed to study the effect of architecture on the initiation of surface cracking in multilayer ceramic coatings. Two modes of crack initiation were considered: 1) tension resulting from stress relaxation, and 2) cyclic thermal fatigue. Transient temperature distributions were determined usin…
The oxygen surface exchange coefficient ( k ) and the self‐diffusion coefficient ( D *) of Ce 0.9 Gd 0.1 O 2 − x (CGO) have been measured using the isotopic exchange, depth profiling (IEDP) method using a secondary ion mass spectrometer (SIMS). At 486°C, D * was of the order of 10 − 10 cm 2 / s and k was 10 − 10 cm /…
Archaea possess a broader range of cell envelope structural formats than eubacteria and their cell walls do not contain peptidoglycan. Some archaea have only a single S-layer as their cell wall (e.g. Methanococcus jannaschii and Sulfolobus acidocaldarius), whereas others have multiple layers (e.g. Methanospirillum hun…
Abstract A full parametric study of the open‐loop behavior of a packed bed reactor‐recuperator system operating under periodic flow reversal produced a series of parametric maps which slow regions of operating conditions for which the system exhibits runaway, stable operation or extinction of the reaction. The reactio…
New routes for the synthesis of high Tg thermally stable polymer foams with pore sizes in the nanometer regime have been developed. Foams were prepared by casting well-defined microphase-separated block copolymers comprised of a thermally stable block and a thermally labile material. At properly designed volume fracti…
Chromatographic and spectroscopic techniques were used to investigate the degradation products from bulk oxidative and thermal stability testing of a substituted tricyclophosphazene high-temperature lubricant. Analytical investigation into the degraded lubricant revealed oligomerization to be the dominant mode of degr…
After repeated shallow discharging and overcharging of nickel or cadmium capacity‐limited cells, a working voltage lowering of the discharge curve was observed. The magnitude of the lowering was higher in the nickel capacity‐limited cells. The x‐ray diffraction pattern of the charged‐state normal nickel electrode cont…
MA'rLOCKI'I'E is a lead halide with chemical formula PbFCI. First described from Matlock, Derbyshire, UK (Greg, 1851), its crystal structure was established using the crystal-chemical studies of Nieuwenkamp and Bijvoet (1932a). On the basis of a powder diffractogram obtained with synthetic P…
Hydrogen-bonded complexes were formed between complementary, proton-donating and accepting components. Symmetric (two-to-one) complexes of 4-substituted benzoic acids and 4,4′-bipyridine and structurally unsymmetric (one-to-one) complexes of benzoic acid derivatives with either 4-cyano or 4-nitro-4′-stilbazole, were s…
ABSTRACT The relationships among inorganic carbon transport, bicarbonate availability, intracellular pH, and culture age were investigated in high‐calcifying cultures of Emiliania huxleyi (Lohmann) Hay & Mohler. Measurement of inorganic carbon transport by the silicone‐oil centrifugation technique demonstrated tha…
An assessment is made of recent test data from France, Japan, and Russia and of earlier test data from the United States in relation to the safety analysis performed for reactivity-initiated accidents in power reactors in the United States. Considerations include mode of cladding failure, oxidation, hydriding, and pul…
The perovskite phosphors which have relatively small bandgaps were synthesized and characterized for their application to field emitter displays. Good crystal powders, homogenous, small (∼1 μm), and spherical, were easily formed without flux. Phosphor preparation parameters such as heat‐treatment temperature, time, an…
The structure of lizardite-1T from Monte Fico, Elba, was refined in space group P31m using neutron diffraction data, measured at 8, 150, and 294 K, and full-profile Rietveld refinement techniques. The lattice parameters at 8 K [a = 5.3267(2), c = 7.2539(6) Å], 150 K [a = 5.3260(2), c = 7.2574(6) Å], and 294 K [a = 5…
The study of organic donor‐inorganic cluster hybrids has been extended to polyoxometalates with higher nuclearities and different shapes using the heteropolyanion [P 2 W 18 O 62 ] 6⊖ combined with bis(ethylenedithio)tetrathiafulvalene. The resulting hybrid material is unique in several respects: the new radical salt h…
A novel combination of S = 1/2 and S = 3/2 spin crossover and magnetic interaction between ligand and central metal exists in the iron(III) complex 1. Compound 1 is readily accessible from the corresponding dimeric thiolatoferrate(III) complex and the corresponding pyridinium salt, and offers a further example for the…
Abstract The construction of high signal‐to‐noise, artefact‐free secondary electron images in the elevated pressure conditions of an environmental SEM is a nontrivial process. The interactions of information carrying species, as well as probe beam electrons, with the chamber gas are the major reasons for such complica…
Abstract A new family of amphiphiles that form tubules (i.e., hollow cylindrical bilayer‐based microstructures) by self‐aggregation has been identified, namely, anionic glucophospholipids of type 1 , in which a double‐tailed hydrophobe is grafted through a phosphate linkage to the O‐6 position of a polar glucose head…
Organic molecular beam deposition (OMBD) enables the deposition of various materials under optimum conditions. This review is restricted to films of metallophthalocyanines (see Figure) and related compounds, which are of interest for opto‐electronic applications. Following a description of typical apparatus and condit…