Materials Literature
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One kind of distortion in P–E hysteresis of ferroelectric thin-film capacitors, namely vertical drift of P–E hysteresis loop, is discussed. This kind of distortion, usually observed in asymmetric ferroelectric thin-film capacitors, originates from the asymmetric conduction of the capacitor at different polarities. The…
Two-component polyurethane flame-retardant coatings were prepared by blending chlorine-containing modified polyesters (DCAOs) and polyisocyanate. DCAOs used were synthesized by polycondensation of dichloroacetic acid, a flame-retardant aliphatic carboxylic acid, with 1,4-butanediol, trimethylolpropane, and adipic acid…
Operation of novel avalanche semiconductor detectors, produced on the basis of heterojunctions Si-SiC and Si-Si/sub x/O/sub y/, is described. A uniform avalanche process with gain from 10/sup 3/ to 10/sup 5/ can be reached depending on the conductivity of the SiC and Si/sub x/O/sub y/ layers. Two types of avalanche ph…
The melting behaviors of selected compositions in the Si 3 N 4 ‐AlN‐Y 2 O 3 system were determined under 1 MPa of nitrogen. The phase diagrams of the ternary and their binary systems are presented. The lowest melting composition of the ternary system contains 15 mol % Si 3 N 4 , 25 mol % AIN, and 60 mol % Y 2 O 3 and…
The magnetic anisotropy and spin structure of κ-(BEDT-TTF)2Cu [N(CN)2]Cl are studied. The antiferromagnetic resonance-like signals are observed.
Abstract Liquid Adsorption Chromatography at Critical Conditions (LACCC) of polymers in combination with Matrix‐Assisted Laser Desorption / Ionization Time‐Of‐Flight Mass Spectrometry (MALDI‐TOF‐MS) and different types of detectors is a very convenient method for the characterization of polymer heterogeneities. A path…
Diffraction properties of an amplitude liquid crystal grating with a periodic electrode structure are studied under different polarizer configurations. Based on these experimental results, polarization characteristics of light diffracted from this grating are discussed. Both diffraction light intensities and polarizat…
The structure of the inorganic misfit layer compound (La 0.95 Se) 1.21 VSe 2 has been determined on the basis of a four-dimensional superspace group. The crystal is composed of an alternate stacking of VSe 2 sandwiches and two-atom-thick LaSe layers. The first subsystem VSe 2 has a distorted CdI 2 -type structure with…
Novel properties of recently developed conducting and insulating polymers and their composites are discussed. Properties of conducting polymer whose main chains are composed of unsaturated /spl pi/-bonds depend strongly on the main chain structure, substituent and also molecular dopants. Various applications of conduc…
We use the cathodoluminescence mode of a scanning electron microscope to investigate the depth and lateral dependencies of the electron-hole pairs generation by the electron beam in Al0.4Ga0.6As semiconducting material. A multiquantum well structure acts as a detector to measure the relative number of generated minori…
Magic-angle-spinning (MAS) deuterium NMR of ${\mathrm{YD}}_{\mathit{x}}$, x\ensuremath{\sim}2, yields spectrally resolved lines for D atoms in tetrahedral (T) and octahedral (O) interstitial sites. Compared to MAS line narrowing of metal hydrides, the deuterides line narrow with only modest, readily attainable spinnin…
The thermal conductivities of two polycrystalline diamond films made by chemical-vapor-deposition process have been measured from a temperature of 15–550 K by using a standard steady-state technique. While one of the samples was of natural abundance composition (98.9% 12C and 1.1% 13C) the second sample was composed o…
Abstract The second‐order elastic constants C 11 , C 12 , and C 44 , isothermal bulk modulus B T , and volume thermal expansion coefficient α are calculated for NaCl crystals in the temperature range (294 to 766 K) using Tallon's model based on the concept of modified Anderson‐Grüneisen parameters. The results obtaine…
Abstract The results of ab initio and MNDO calculations of the Cl 2 C = CHOCH 3 , XCOCl (X = CH 3 , OCH 3 and COCl), 4-ClC 6 H 4 CH 2 Cl, (CNCl) 3 and PCl 5 with total optimization of their geometry are presented. The ab initio calculations were executed using Hartree-Fock theory and the split valence basis set 6-31G*…
Anodic oxides of thickness 1–10 nm have been grown on Si(100) using anodic oxidation at room temperature. The electrolyte was 0.1 M HCl. The effects of the anodic potential, growth time, external visible illumination intensity, substrate doping type, and density on the oxide thickness were determined. Coulometric and…
Electrical transport and the nature of carriers in the homovalent substitution LLaFe x Ni1–x O3 were investigated as a function of component, in the temperature range 10K–300K, by dielectric properties, dc and ac conductivities and thermopowers. At x > 0·6, the positive thermopowers indicate the major carriers of hole…
Mechanochemistry of hydrothermally prepared Al‐free and Al‐substituted 1.1 nm tobermorite was studied using 29 Si NMR, XRD, and TGA‐DTA. Tobermorite has a double‐chain structure and Al/Si substitution occurs preferentially at bridging tetrahedra. By using the vibration mill, both tobermorites were observed to decompos…
Summary Laboratory experiments were carried out to evaluate the effect of pH, ionic strength and electrolyte composition on zinc sorption–desorption by two Andepts from the Canary Islands (Spain). At the natural soil pH, the soils exhibited little net negative surface charge and small Zn sorption capacities. More than…
The dynamical properties of binary liquid mixtures are investigated within a viscoelastic model using the memory function approach. Extending the viscoelastic model to the binary case we find that the dynamical properties of the liquid mixture are characterized by four propagating and two diffusive modes. We show that…
Abstract Hydrogen- (δD = −106 to −97‰) and oxygen-(δ 18 O = +14.0 to +16.6‰) isotope compositions of kaolinite from late Cretaceous and Oligocene deposits at Iwaizumi, northeastern Japan, indicate that these clays formed by weathering of volcanic parent rocks, rather than during hydrothermal (>100 °C) alteration. T…