Materials Literature
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Longitudinal and transverse magnetostrictions of polycrystalline samples of intermetallic compounds RMn 2 Ge 2 (R=Sm or Gd) are measured in pulsed magnetic fields up to 250 kOe. It is found that linear magnetostrictive strains of about 10 −3 arise in a temperature range in which the magnetic field causes a change in t…
The iodine K-edge EXAFS study of KIO3 was performed to clarify local structural changes on the successive phase transitions. The pair-distribution function of three oxygen atoms in an oxygen octahedron is almost independent on temperature like a covalent bond, whereas that of the other three is gradually reduced with…
This paper describes the effect of alkyl and alkoxy chain lengths on the thermal properties of four isomeric systems; 4-R-phenyl 4-(4-octyloxybenzoyloxy)benzoates ( 1 ), 4-octyloxyphenyl 4-(4-R-benzoyloxy)benzoates ( 2 ), 4-(4-R-benzoyloxy)phenyl 4-octyloxybenzoates ( 3 ), and 4-R-phenyl 4-octyloxyphenyl terephthalate…
Self-trapped holes (STH), self-trapped excitons (STE) and shallow electron centres in small AgCl crystals embedded in a KCl crystalline matrix have been observed by means of optically detected magnetic resonance (ODMR). The existence of the impurity clusters in heavily doped KCl:AgCl single crystals, ranging from sing…
A high-performance phase change optical recording disk, which has a five-layered structure, was proposed. This disk has a ZnS adhesion layer between a GeSbTe recording layer and a ZnS–SiO 2 second dielectric layer. A 2×10 5 overwrite cyclability was achieved with the original five-layered phase change optical recordin…
Size-dependent excitonic photoluminescence (PL) of CuBr nanocrystals is studied using both, resonant and band-to-band excitation. Narrow excitonic emission lines observed in big nanocrystals (mean radius >5 nm) transform into two wide emission bands in smaller nanocrystals. These two bands are not significantly narrow…
Zur Messung der charakteristischen magnetischen Eigenschaften wie z B die Ummagnetisierungsverluste von ferromagnetischen Materialien ist die Aufnahme ihrer Hystereseschleife in Abhängigkeit von der Frequenz eine gut geeignete Methode. Da gerade bei extrem weichmagnetischem Material hohe Anforderungen an die Messung g…
Conditions for a self-organized formation of ordered hexagonal structure in anodic alumina were investigated, using oxalic or sulphuric acid as an electrolyte. Highly-ordered nanopore arrays with pore densities of 9×10 9 -6.5×10 10 cm -2 and high aspect ratios over 3000 were fabricated by a two-step anodization proces…
Undoped p-GaSe layered single crystals were grown using Bridgman technique. Thermally stimulated current measurements in the temperature range of 10-300 K were performed at a heating rate of 0.18 K/s. The analysis of the data revealed three trap levels at 0.02 , 0.10 and 0.26 eV. The calculation for these traps yielde…
The low-temperature thermally stimulated luminescence (TSL) in both porous silicon (PS) layers on Si substrate and PS powder has been found in the 4.2–300 K temperature range. The dependence of the TSL effect on the wavelength and temperature of an excitation was studied in detail. The shape of TSL glow curves display…
Abstract Further investigation of the synergistic effect of smoke suppression between cuprous oxide and molybdenum trioxide in rigid poly(vinyl chloride) (PVC) was carried out by using a cone calorimeter (cone) at a high incident heat flux of 50 kW m −2 . Experimental data derived from the cone calorimeter indicated t…
A new method is demonstrated for the quantification of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides. It is based on the linear combination of two reference X-ray absorption near-edge structure (XANES) spectra at the Ti K edge. The proper selection of a Ti-O-Si reference material is most important for the successfu…
Novel dinuclear lanthanide complexes, [REL 3(phen)]2 (where RE = La, Ce, Pr, Nd, Sm, Eu, Gd; HL = trans-2,3-dimethylacrylic acid, phen = 1,10-phenanthroline), have been synthesized. The single crystal structures of [LaL3phen]2 and [GdL3phen]2 have been determined by X-ray crystallography, which shows that they are iso…
High-resolution transmission electron microscopy (HRTEM) was used to characterize the cross-sectional and planar atomic structures and bonding states of highly tetrahedrally bonded amorphous carbon (ta-C) films, particularly concentrating on the surface layer and interface between substrate and pure ta-C film. A ``san…
The objective of this project is to gain insight in the behavior of the non-woven felt commercially know as Dyneema Fraglight. The following activities were performed during the period covered by this report: 1) Tests at different temperatures and orientations. 2) Search of characteristic length of fiber and fabric. 3…
Fluorine-chlorine-doped silicon-dioxide films have been deposited at 200 °C by the remote plasma-enhanced chemical-vapor-deposition technique using SiF4 and SiCl4 as silicon precursors in combination with O2/He/H2 mixtures. The behavior of the deposition rate and structural properties of the films as a function of SiF…
The pitting potential Epit of 18/8 CrNi stainless steels with different sulfur content (0.003, 0.017 and 0.29%) has been determined from potentiodynamic polarization curves in deaerated neutral solutions (0.1 M NaCl and 1 M Na2SO4 + 0.1 M NaCl) with nominally identical chloride content. Epit decreased with increasing…
Lithium or any lithium alloy like the lithium lead alloy Pb-17Li is an attractive breeder material used in blankets of fusion power reactors because it allows the breeding of tritium and, in the case of self-cooled blankets, the transfer of the heat generated within the liquid metal and the walls of the cooling ducts…
Abstract Poly(ethylene terephthalate) (PET) and poly (butylene terephthalate) have been modified by diamide units (0.1–1 mol%) in an extrusion process and the crystallization behavior studied. The diamides used were: for PET, T2T‐dimethyl (N, N′‐bis( p ‐carbomethoxybenzoyl)ethanediamine) and for PBT, T4T‐dimethyl (N,…
Crystal structures of(Ba1-xLax)2In2O5+x (x=0.00, 0.20, 0.30, 0.40, 0.50) were analyzed by EXAFS and the powder X-ray Rietveld method. A Fourier transform of In K-edge EXAFS data from (Ba1-xLax)2In2O5+x showed a peak between 1.2 and 2.0 A attributed to the nearest oxide ions around In3+ cation. The peak as back-Fourier…