Materials Literature
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The development of a percutaneous artificial internal organ system requires a reliable biocompatible connection between the external environment and the inside of the human body. Such is necessary for the success of a permanent left ventricular assist device. However, the search for a satisfactory interface at the epi…
The magnetic behavior of MnZnTi and NiZn ferrite films, deposited by laser ablation, is studied comparatively to that of the bulk material, using a vibrating-sample magnetometer (VSM), transmission, and conversion electron Mössbauer measurements. Both the VSM and Mössbauer analysis show that the films exhibit the sing…
Gamma-radiation-induced absorption spectra (2.15 MGy(Si)) are compared in N-doped and pure silica fibers fabricated by surface plasma CVD-process under different regimes with the aim to reveal the chief absorption mechanisms in the telecom spectral windows and to work out an optimum fiber design. The long wavelength a…
In our present study, a shrinkage anomaly present during sintering in an anatase powder compact was examined. It was observed that the shrinkage stagnates during sintering. This anomaly has been investigated using dilatometry, X‐ray powder diffraction, and scanning electron microscopy. Quantitative phase analysis usin…
Density functional calculations are used to investigate the relationships among lattice distortions, magnetic ordering, and electronic properties in manganite perovskites. Distortions open narrow pseudogaps at the middle of the majority eg manifold. The effect on transport is very dependent on doping and falls off as…
All articles of this category Fused-norbornene blocks, formed by the condensation of porphyrin vic -diamines with polyalicyclic α -diones, have been used to produce mono-porphyrin systems linked to other effector units or new U-type cavity bis -porphyrins using ACE or s -tetrazine coupling protocols. porphyrins - dipo…
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…