Materials Literature
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The compounds Ln2AuP3 were synthesized by reaction of the elemental components in evacuated silica tubes. Their crystal structures were determined from single-crystal diffractometer data. The compounds with Ln = La, Ce, and Pr crystallize with an orthorhombic U2NiC3 type structure (Pnma, Z = 4). The structure refineme…
Power loss of nonoriented electrical steel was measured under sinusoidal and square wave excitation. The results show that total power loss under sinusoidal excitation is higher than that under square wave excitation. The total loss difference at the same peak flux density ranges from 7% to 15%. The dynamic losses dep…
A dielectric-film waveguide with a grating etched on its film-cover interface can be used as a polarization converter. The e wave can be converted into the h wave and vice versa if the guided wave is incident obliquely to the grating vector. The polarization converter is analyzed by use of a quasi-optic technique. A h…
Abstract The short-range order of vitreous V20 5 and of three (Zn0)Jt(V20 5)1_x glasses with x = 0.2, 0.4, and 0.5 is studied by X-ray and neutron diffraction experiments where the change of the contrast allows to resolve the V -0 and Z n -0 correlations. The V -0 and the Z n -0 first-neighbor peaks are approximat ed…
The effects of the water/TEOS ratio, pH, temperature and alcohol/TEOS ratio on the degree of polymerization and gelation time in the acid-catalyzed sol-gel polymerization of TEOS have been studied systematically with Monte Carlo simulation. Although linear polymerization by bimolecular reaction was assumed, the revers…
A generalized definition of the coupling coefficient, useful for the evaluation of transducers that incorporate an electrostrictive active element, is introduced. The definition is expressed under quasistatic conditions and becomes zero when no bias is applied (assuming that the effects of remanence are negligible), a…
Electron energy-loss spectroscopy (EELS) has been used to determine the valence state of manganese for all the samples at low temperature (93 K). EELS results indicate that the valence state of manganese keeps constant (∼3.5) for all the samples. The effects of the A-site cation size mismatch on the charge ordering (C…
High purity alumina ceramics have been used for more than 25 years in biomedical applications due to their excellent wear behaviour and high strength. Nevertheless great effort have been undertaken to develop a material with increased strength combined with excellent wear properties. One candidate material family is Z…
Polyurethane elastomer (AU) and silicone rubber (VMQ) form immiscible blends with a low compatibility. In order to improve the compatibility and physical properties of the blends, VMQ was first grafted with vinyl triacetoxy silane (VTAS) by using dicumyle peroxide (DCP) as a grafting initiator; subsequently, it was bl…
Abstract An experimental procedure to determine metallic thin film thicknesses by using electron probe microanalysis (EPMA) is presented. Several monoelemental films of Al, Ti, Cr, Cu, Nb, Mo and Au with different thicknesses, deposited on an Si substrate, were characterized by Rutherford backscattering spectrometry f…
Sublimation and deposition of the metal-organic complex palladium (II) acetylacetonate [ Pd(acac)2] was investigated through thermogravimetry and XRD. The temperature range for sublimation, avoiding thermal decomposition, was determined to be 100−160 °C and required to take place in the presence of an inert gas such a…
Dielectric measurements on a sample consisting of banana-shaped molecules were carried out in a frequency range between 0.1 Hz and 10 MHz. The sample exhibited B2 and B4 phases. As usual, two ranges of relaxation were detected in the B2 phase, the fast reorientation about the long axes of the molecules and a slow coll…
We report the results of optical in situ monitoring of the epitaxial growth of perovskite oxide thin films by an oblique-incidence reflectance-difference (OIRD) technique. Optical oscillation that corresponds to the growth cycle of an interrupted growth mode (monolayer oscillation) is observed. The monolayer oscillati…
Polycondensates with too short chains can be chain-extended with repair molecules. In this report, the molecular weight and, thereby, the melt viscosity of polyamides is enhanced in the extruder by two chemically very different types of repair molecules. Firstly, the chains were extended linearly with a bisoxaline whi…
FT-IR, UV-spectroscopy and X-ray diffraction of thiourea-Poly (vinyl alcohol) (PVA) complexes have been investigated. It was observed that thiourea affected the structure of PVA. X-ray study revealed that as the thiourea salt increases the crystallinity of PVA increases. The dielectric properties of thiourea-PVA compl…
A novel nonlinear optical complex crystal with an organic ligand coordinated through an O atom: tetrathiocyanatocadmiummercury-dimethyl sulfoxide, [CdHg(SCN)4(H6C2OS)2], (CMTD) is reported for the first time. Single crystals have been grown by temperature-lowering method, the crystals tructure has been determined, and…
Polarization properties of elliptical-core liquid crystal optical fibres have been investigated and the experimental results on the liquid crystal fibres in the polarimetric configuration subjected to the influence of hydrostatic pressure and temperature are presented.
The induced uniaxial anisotropy field H/sub k/ in very thin films sandwiched by Ta or Cu layers was investigated. The value of H/sub k/ of the Ta/Cu/Ni/sub 79/Fe/sub 21//Cu/Ta film decreases as film thickness decreases below 20 nm, even after an annealing procedure in a magnetic field. This H/sub k/ reduction is simil…
The role played by inorganic chemical additives in fire retardancy and flame inhibition is considered. Particular attention is given to the molecular level aspects of commercially important systems containing compounds of antimony, halogens, and phosphorus. The flame inhibiting function of metal containing additives i…
Solid-state extrusion technique was employed for the improvement of flexural strengths of poly(L-lactic acid) (PLLA) that is currently used as materials for various internal fixation devices. PLLA was vacuum compression molded to have two different crystallinities, from which cylindrical billets of various diameters w…