Materials Literature
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Experiments on three double-layer (n=2) Ruddlesden–Popper (RP) systems are reported. Doping Sr1.8La1.2Mn2O7 (Tc=126 K) with Nd to form Sr1.8La1.2−xNdxMn2O7 leads to a reduction in Curie temperature for low doping levels (x=0.2), and to behavior reminiscent of Sr1.8Nd1.2Mn2O7 for x⩾0.7. This suggests that it may be pos…
The natural aging of cellulosic materials (high purity paper, cotton, raw and bleached flax, viscose) was simulated by thermal oxidation in air at constant temperature (123–192°C). Also the synergetic effect of light was investigated at 50–85°C. The kinetics of polymer degradation was followed through intrinsic viscos…
The temperature dependence of the x-ray absorption spectra above the L 3 absorption edge of bismuth in the superconducting oxide Ba0.6K0.4BiO3 are investigated. It is found that the local structure is different from the simple cubic structure indicated by x-ray and neutron-diffraction data. It is shown that the oxygen…
Vanadium oxide films have been prepared by plasma‐enhanced chemical vapor deposition for rechargeable lithium‐battery applications. Vanadium oxytrichloride was employed as the vanadium precursor. Various parameters, such as the partial pressures of carrier gas and reactant gases, substrate temperature, and radio‐frequ…
Abstract Complex dielectric spectra up to 20 GHz are measured at 25°C for n‐butanol tetrachloromethane mixtures. Within this frequency range the spectra can be described by two Debye‐processes. Their relaxation times τ (1) 1 and τ (2) 1 are compared with the hypothetical single‐particle relaxation time of the dipoles…
Boehmite (AlO(OH)) solid‐solution gel, which yields stoichiometric mullite (3Al 2 O 3 2SiO 2 ) at high temperatures, has been prepared by the hydrazine method. The formation process leading to 3Al 2 O 3 2SiO 2 is discussed. The as‐prepared powder and powders heated below 1200°C consist of very fine particles showing n…
Scintillators are high density luminescent materials that convert X-rays to visible light. These materials have been used since the turn of the century to dramatically enhance the sensitivity of film cartridges used in medical diagnostics. Coupling scintillators to photodiodes, charge coupled devices (CCDs), and photo…
The nucleophilic substitution reaction of poly(epichlorohydrin)(PECH) with phenolate has been studied. This process is accompanied by dehydrochlorination, which leads to a considerable proportion of vinyl ether moieties. The elimination side reaction seems to be responsible for the cleavage usually observed in this ki…
Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a…
A mathematical model was developed for the characterization of hydrogen permeation into metals and alloys under corroding conditions. The model requires a knowledge of the corrosion rate of the given metal or alloy in solutions of various concentrations. It provides quantitative values of rate constants of the hydroge…
New lead magnesium niobate (PMN) ceramics, which can generate large strains at moderate electric fields, are good candidates for future actuators or sonar projectors. In this paper, two finite element models are proposed to describe static analysis of electrostrictive materials. Both models include quadratic dependenc…
Pretulite is a new Sc phosphate with zircon-type structure from the phyllite-micaschist hosted hydrothermal lazulite-quartz veins in the Lower Austroalpine Grobgneis complex, eastern Austria. The new species is the Sc-dominant analogue of xenotime-(Y) and occurs as an accessory mineral in all investigated lazulite spe…
Several series of new b-nylon 6-b-polyimide-b-nylon 6 triblock copolymers were synthesized via a condensation polymerization of polyimide segments and anionic polymerization of the nylon 6 components. Crystallization and phase behavior of these triblock copolymers have been studied with varying polyimide block molecul…
Solid samples of the salt [Eu〈LOEt〉2(H2O)2]BF4, (〈LOEt〉 = [CoCp{P(OEt)2O}3]) may be reversibly dehydrated under very mild conditions to give the corresponding mono aqua complex [Eu〈LOEt〉2(H2O)]BF4. The conversion can be monitored by single crystal x-ray diffraction. In the course of the reaction the crystallinity of t…
We have fabricated ferromagnet-insulator-ferromagnet junctions using a ramp-edge geometry based on (La0.7Sr0.3)MnO3 ferromagnetic electrodes and a SrTiO3 insulator. Pulsed laser deposition was used to deposit the multilayer thin films and the devices were patterned using photolithography and ion milling. As expected f…
Sintered Nd–Fe–B magnets were coated by pulse nickel plating at different plating conditions. Optimal pulse plating condition was established (average current density=1 A/dm2, peak current density=6 A/dm2 with Ton:Toff=1:2). In order to make a comparison, magnets with similar nickel coating thickness plated by dc were…
The solvent effect on the radiationless transition rates from the excited triplet MLCT (metal-to-ligand charge-transfer) states of tris(bipyridine)osmium(II) (Os(bpy) 3 2+; bpy = 2,2‘-bipyridine) and tris(phenanthroline)osmium(II) (Os(phen) 3 2+; phen = 1,10-phenanthroline) was investigated in water−methanol mixed sol…
The configurational distribution of phosphoglycerate kinase (PGK) strongly-denatured in 4 M guanidine hydrochloride solution is investigated using small-angle neutron scattering (SANS) and Monte Carlo computer simulation. It is shown that the experimental scattering profile can be represented by a random flexible chai…
The crystal structure of the recombinant apo-form of glycine N-methyltransferase (GNMT) has been determined at 2.5 A resolution. GNMT is a tetrameric enzyme (monomer Mr = 32,423Da, 292 amino acids) that catalyzes the transfer of a methyl group from S-adenosylmethionine (AdoMet) to glycine with the formation of S-adeno…
Three new compounds were obtained by slow diffusion of [Ni(dmit) 2 ] - (dmit = 2-thioxo-1,3-dithiole-4,5-dithiolato) into 4-(dimethylamino)-1-methylpyridinium [C 1 ] +, 4-[2-(4-(dimethylamino)phenyl)ethenyl]-1-methylpyridinium [C 2 ] +, and 4-[4-(4-(dimethylamino)phenyl)-1,3-butadienyl]-1-methylpyridinium [C 3 ] + . […