Materials Literature
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Analytical electron microscopy offers two main techniques of interest to materials science: electron energy-loss spectroscopy (EELS) and energy-dispersive x-ray analysis (EDX). The scientist is confronted with the choice of one of the two for the problem under consideration, although it is possible to employ both simu…
A new approach is presented for determining surface state parameters at semiconductor interfaces using time resolved surface photovoltage spectroscopy. The analysis provides precise determination of surface state energies, densities, occupancies, and cross sections for electrons and photons (including the wave-length…
A new six-dimensional Burgers vector of dislocations in Al–Cu–Fe and Al–Pd–Mn icosahedral quasicrystals has been determined to be 1/2〈11 – 200 – 2〉 by means of defocused convergent-beam electron diffraction. The component of the Burgers vector in the physical space is parallel to a twofold axis with a magnitude of 0·1…
A high temperature homogenization treatment (1100 degrees C for one hour) is applied to sintered magnets of Nd/sub 17/Fe/sub 76.5/B/sub 5/Cu/sub 1.5/. This is followed by a low temperature anneal (600 degrees C for one hour). The magnetic properties of the samples are related to their microstructure. The formation of…
New smectic C base materials, 6-alkyl-2-(4-alkyloxyphenyl)quinolines, were prepared and their physical properties investigated. Each compound showed a wide SmC temperature range. The rotational viscosities for the phenylquinoline derivatives were evaluated by switching studies in mixtures with a 2-ring phenylpyrimidin…
Amorphous silicon nitride thin films prepared by low pressure chemical vapor deposition have been investigated by x‐ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The attenuation lengths and escape depths of Si 2p photoelectrons with kinetic energy of 1385 eV from silicon nitride thin…
Absorption and excitation spectra of lanthanides molybdates and tungstates were measured and analyzed. Probabilitles of electronic transitions were analysed on the basis of the Judd-Ofelt theory. The significant differences of intensities were observed. Those differences could result from the symmetry changes, coopera…
The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of ox…
We report the first application of a tunnel diode circuit to investigate the de Haas–van Alphen effect and superconducting critical field values in small single crystal organic conductors. The materials of interest are in the family of charge transfer salts (BEDT-TTF)2X, where X is one of a number of anion structures.…
In this paper we present data on the electro-optic switching tilt angle memorisation properties of polymer doped ferroelectric liquid crystalline mixtures. Side chain polysiloxane polymers at concentrations up to 11% w/w were added to the low molar mass mixtures ZLI-4237–000 and -100. The response times of the 11% w/w…
The electrochemical behavior of 99.999% aluminum (Al), 99.95% Al, and 99% Al in weak, acidic chloride solutions containing indium (In) salt was investigated. Activation of Al electrodes in the solution depended primarily on purity of the electrode. In all tests, time intervals between the addition of the In salt solut…
Abstract Three‐dimensional orientation distributions of grains in polycrystalline aggregates are referred to as crystallographic textures. They can be calculated from centrosymmetric two‐dimensional pole figures by means of series expansion methods or by direct methods. Both techniques lead to inaccuracies, caused by…
Water samples taken from Loch Leven, Scotland, contained unicellular centric diatoms dominated by a taxon we called Stephanodiscus hantzschii Grunow. It existed as several morphotypes, and these are described and compared with the type material of S. hantzschii from the Rabenhorst exsiccata 1104. The morphological fea…
Arsenic (As) is a widely distributed soil contaminant because of past use of As‐containing pesticides. The total As content of representative soils used for agriculture in the major soil areas of Louisiana was determined. The As content of > 450 samples ranged from near zero to 73 mg/kg with a mean of 23.2 mg/kg. Gene…
Several morphotypes of the “Orthoseira roeseana” complex from different localities have been examined and their appreciable morphological variability is illustrated and discussed. The shape of girdle-bands of “spiral” forms is described and depicted in SEM. The occurrence of valves with a ring of wall attenuations at…
Abstract The catalytic activity of polyaniline derivatives in the dehydrogenative oxidation of benzylamme to N-benzylidenebenzylamine is effected by protonic acid doping.
With a parallel component removed, the room temperature conductance of V‖amorphous-V2O5‖V sandwiches at low voltages (8<qV/kT<15) is stepped at discrete values G=2ie2/h, where h is Planck’s constant, e is the electron charge, and i is the integer or half-integer. In contrast with similar results reported…
Write and erase characteristics at low linear velocity in GeSbTe phase-change optical disks have been studied using 488 nm and 680 nm visible lasers. Good characteristics, which are carrier-to-noise ratio (CNR) of more than 50 dB and erasability of more than 25 dB, were obtained by optimizing the composition of GeSbTe…
This is a study of complement components secreted by gastric cancer-derived cell lines (MKN28, MKN45, MKN74 and KATO-III), each of which has a different histological origin. Haemolytic activity of complement component was detected only in the culture supernatant of KATO-III (C2 activity) and in that of MKN45 (C5 activ…
Magnesium alloys possess unique properties, which when fully exploited can open up for major inroads into important markets for structural applications. A density of 2/3 that of Al, and only slightly higher than for fibre reinforced plastics, combined with excellent mechanical and physical properties as well as proces…