Materials Literature
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Polymer composites based on organically modified phyllosilicates (organoclay) and poly(ethylene- co -vinyl acetate) (EVA) were prepared by melt processing to study their combustion behavior. Their degrees of dispersion and intercalation spacings as determined by transmission electron microscopy (TEM) and X-ray diffrac…
We report the solution-based synthesis of single-crystalline nanorods composed of barium titanate (BaTiO3) and strontium titanate (SrTiO3), which yields well-isolated nanorods with diameters ranging from 5 to 60 nm and lengths reaching up to >10 mum. Electron microscopy and diffraction measurements show that these nan…
Over the past years, various attempts have been made to accurately model the radiation response of the optical attenuation in optical fibres for nuclear environments. In this paper we present the results of a study on pure silica fibres where both the spectral and kinetic behaviour are explored during and after irradi…
Preparation of quartz (rock crystal) films has been studied by an atmospheric pressure chemical vapor deposition method using Si(OC2H5)4 and O2 as starting materials in the presence of gaseous HCl. The films were deposited onto a sapphire (0001) substrate at 600–850 °C with a growth rate of 0.3–3.0 µm h−1. Their X-ray…
A novel cobalt beryllophosphate (CBP-CHA) with the chabazite framework topology has been hydrothermally synthesized by using a metal amine complex as a starting material. The structure was solved by single-crystal X-ray diffraction {crystal data for [C6N4H24]CoBe6P6O24·3H2O: M = 889.14, rhombohedral, space group R, a…
The possibility of exploiting the self-organization of mobile silicon atoms on silicon surfaces during ultrahigh vacuum thermal annealing for the construction of silicon-on-silicon structures is demonstrated. Rearrangement of the surface during thermal decomposition of an oxide layer can be controlled allowing the gro…
The crystal structure of Pb 7 O 4 (OH) 4 Cl 2 (monoclinic, C 112 1 , a = 5.791(2), b = 12.998(4), c = 19.330(6) A, γ = 90.089(3)°, V = 1455.1(8) A 3 ) has been solved by direct methods and refined to R 1 = 0.061 using X-ray diffraction data collected from a crystal twinned on (010). There are seven symmetrically indep…
The dielectric parameters of 50-μm-thick polyimide samples irradiated in air with 1 MeV electrons and in BF3 solution with Co-60 gamma rays were studied. The dielectric constant of polyimide was found to decrease with increasing electron fluence and dose of gamma rays. At an electron fluence of ∼1015 e/cm2, the dielec…
We report on the observation of enhanced low-field magnetoresistance in La2/3Ca1/3MnO3/Pr2/3Ca1/3MnO3 (LCMO/PCMO) superlattices with ultrathin PCMO layers. In particular, [LCMO(100 Å)/PCMO(10 Å)]17 superlattice exhibits magnetoresistance MR=Δρ/ρ0=−55% in a magnetic field of 500 Oe and at temperature 219 K. The enhance…
The compound {C6H2[CH2OCH2C(pz)3]4[Mn(CO)3]4}(BF4)4 forms a 3D sinusoidal architecture with 16 × 7 Å channels organized by π–π stacking and weak C–H⋯F hydrogen bonds.
The present report contains recommendations on the nomenclature of the labuntsovite-group (LG) minerals based on a crystal-structural classification. The labuntsovite group includes hydrous titanium and niobium silicates, both orthorhombic and monoclinic, with a structure characterized by a framework consisting of cha…
Raman scattering and photoluminescence techniques were applied in the study of structural changes in benzophenone recorded during benzophenone's transit between glass and crystalline phases. It has been found that the structure of glassy benzophenone is essentially heterogeneous: consists of ``structured clusters'' wi…
Abstract Several imines were synthesized and evaluated as water‐initiated hardener for epoxy resin. Imines with a lower electron density on the C=N carbon showed a faster hydrolysis rate. Diethyl ketone‐based imines were the most efficiently hydrolyzed among the imines examined, and the adhesive properties of epoxy re…
Schneebergite and nickelschneebergite are new members of the tsumcorite group; they represent the bismuth analogues of cobaltlotharmeyerite and nickellotharmeyerite. The two minerals were discovered on samples from the former mining area “Am Roten Berg”, Schneeberg, Saxony, Germany; associated minerals are scorodite,…
The a- and c-axis-oriented epitaxial thin films of layered nickelate La2−xSrxNiO4 (0.5⩽x⩽1.5), of which bulk single crystals are not available, were grown on LaSrAlO4 (100) and (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (001) substrates, respectively. Due to the in-plane anisotropy of the lattice mismatch, the lattice parameters…
The dielectric and conduction behavior of La-doped SrTiO3 annealed in different atmospheres was studied. The results showed that the quantum-paraelectric behavior was purely suppressed by La doping. A variable-range-hopping conduction was observed for the samples annealed in a strongly reducing atmosphere, and subsequ…
We have developed a parallel film growth method on a temperature-gradient substrate to quickly control and optimize the film growth mode. A continuous-wave neodymium-doped yttrium–aluminum–garnet laser heating was used to achieve a stable temperature gradient covering a 300 °C range of temperatures over a distance of…
The multiwall carbon nanotubes (MWNTs) synthesized by microwave plasma enhanced chemical vapor deposition in 0.1% CH4 (H2 dilution) reaction gas were shaped in curly structures with the blocked nanoholes and closed caps. On the contrary, the carbon nanotubes with different structures could be obtained in oxygen loaded…
Single crystals of a pseudoquaternary Heusler alloy, Ni52Mn16Fe8Ga24, have now been synthesized. The substitution of Fe for Mn strengthens the magnetic exchange interactions, increasing the Curie temperature to 381 K. The Fe also increases the Ni magnetic moment to 0.41 μB relative to that in the stoichiometric Heusle…
Polycrystalline boron carbon nitride (BCN) films are synthesized at various temperatures by plasma-assisted chemical-vapor deposition. BCN films are characterized by x-ray photoelectron spectroscopy, transmission electron microscopy, and transmission electron diffraction. The dielectric constant is estimated from the…