Materials Literature
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Relations between the concentrations of neutral (N0) and charged (N+) single-substitutional nitrogen and of nitrogen–vacancy (N–V) complexes in chemical vapour deposited diamond films of ≈︂0.2 mm thickness with nitrogen impurity concentration levels of 10 ppm are studied. For this purpose the films were subjected to 8…
Abstract Secondary clay minerals observed in the two uppermost basalt lava flows at ODP Site 1001, in the Caribbean Sea, drilled from the large igneous province of Cretaceous age, result from low-temperature alteration processes. Alteration mainly proceeds by circulation and diffusion of sea water. Six different types…
The interaction of γ-glycidoxypropyltrimethoxysilane (GPS) with oxidised aluminium substrates has been investigated in terms of the effect of the drying, or curing, temperature. Samples treated with aqueous solutions of GPS at concentrations of 1,4 and 8% v/v were cured at 25, 50, 93 and 120°C. X-ray photoelectron spe…
Electric contacts for phosphorus (P)-doped n-type diamond films have been studied. The P-doped {111} homoepitaxial diamond thin films with n-type conduction are grown on high temperature high pressure diamond substrates by microwave-enhanced plasma chemical vapor deposition. The donor density and crystallinity of the…
The thermoelectric power and dc conductivity of La2/3TiO3−δ (δ=0.057, 0.07, and 0.16) were investigated. The thermoelectric power is negative between 80 and 350 K. The measured thermoelectric power of La2/3TiO3−δ increases linearly with temperature, in agreement with the model proposed by C. Wood and D. Emin [Phys. Re…
Non-axenic unialgal cultures of eleven marine diatoms were screened against 13 pathogenic bacteria and 8 pathogenic fungi by agar disc diffusion method. The lipophilic and aqueous extracts of 6 diatoms which showed high antibacterial activity were separately screened against the same bacterial strains and two diatoms…
Pressureless‐sintered TiO 2 ‐excess BaTiO 3 (BT) ceramic doped with Na 2 O (as an acceptor oxide) has been investigated for the inhibition of platelike (111) twin grains and the associated microstructure development. Solid‐state reaction between the Na 2 O dopant and the excess TiO 2 of the nonstoichiometric BaTiO 3 p…
Titanium rich alloys of the Ti–Al–C system have been investigated to determine the constitution in the range 1250–750°C with particular reference to phase equilibria and transformations involving TiC and Ti3AlC (P phase). Alloys with varying aluminium and carbon concentrations up to 15 at.-%Al and 15 at.-%C have been…
Elastic modulus (Young's modulus M and shear modulus G ) and internal friction Q -1 are measured as a function of temperature from -180°C to 500°C in undoped lead zirconate titanate (PZT) ferroelectric ceramics in the range of kHz and low frequencies (0.1 to 1 Hz). New phase transition temperatures at the morphotropic…
Multicolor fluorescent liquid crystal displays (LCDs) are proposed. The twisted nematic (TN) cell containing a dichroic fluorescent dye is utilized as a UV shutter, a polarization switch and an active emitter. We describe two fluorescent LCD modes of different stacking order of the fluorescent TN cell, alternative flu…
The use of depleted uranium dioxide (DUO2) particulates as fill material for repository waste packages (WPs) containing light-water reactor (LWR) spent nuclear fuel (SNF) was investigated. A repository WP would be loaded with SNF, and small DUO2 particulates (0.5 to 1.0 mm) would be added to fill the void space inside…
The double-bridged tetraselenafulvalenophanes (TSF-phanes, 4) were efficiently synthesized by a new method using the deprotection/realkylation sequence of the TSF bisthiolate building block 7. Electrocrystallization of 4b with the Au(CN)2− counter-anion gave a radical cation salt that showed a very high conductivity o…
Abstract Recent years have seen a growing interest in the direct and indirect roles of organisms, and more explicitly of organic matter, in the crystallization of minerals in sediments. Two bivalve genera form extensive biofilms that are apparently responsible for the growth of a variety of isolated crystals together…
A study is reported of the dependence of the TiSe 2 lattice constants on the concentration of an intercalated metal in various valence states and external pressure. The strain energy and the polaron shift created in the intercalation of TiSe 2 with metals in various valence states have been determined. The position of…
A new qualitative mechanism of pore nucleation and initial stages of porous silicon ( por -Si) growth was proposed. The emphasis was on the charge exchange between Si 2+ ions generated by electrolytic or chemical oxidation of initial silicon (disproportionation reaction). The mechanism eliminates, to a large extent, t…
A previously unreported defect, which is labeled $O3,$ has been observed in the EPR spectrum of synthetic type-IIa diamonds irradiated at 100 K with 2 MeV electrons. This defect was not observed in identical diamonds whose temperature during electron irradiation was \ensuremath{\geqslant}300 K. This center has also be…
A two-dimensional mathematical model for vacuum-contact drying of wood is presented. The moisture and heat equations are based on the water potential concept whereas the pressure equation is formulated considering unsteady state conservation equation of dry air. Most of the model parameters were determined during inde…
Photosynthetic organisms inhabiting the caves of Frasassi (Italy) were identified and aspects of their strategy of acclimation to the cavern environment investigated. The habitats of the organisms were characterized with special reference to light, the inorganic carbon system and the availability of inorganic N, P and…
The support–overlayer adsorptive interactions, generated when solutions of Anderson heteropolyoxomolybdates were supported as a monolayer on γ-Al 2 O 3 by means of the equilibrium adsorption method, were studied by XRD analysis, DR spectroscopy, electron microscopy (SEM–EDAX) and TPR methods. The adsorption isotherms…
The reaction by which kaolinite transforms to I-S has been studied by SEM and TEM using core samples from the Salton Sea Scientific Drilling Project. Kaolinite is abundant from the surface to a depth of ∼300 m (∼115°C), decreasing in abundance and becoming undetectable at a depth of ∼500 m (∼160°C), with a concomitant…