Materials Literature
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The magnetization of a MnFeAs/sub y/P/sub 1-y/ system for y=0.275 and y=0.30 is measured under a static magnetic field up to 28 T at temperatures from 4.2 to 400 K. Field induced phase transitions are observed, and the critical points are found on (B, T) phase diagrams. In the case of y=0.275, the pressure measurement…
Many discussions of miscibility in polymer blends are based on the Gibbs free energy for a strictly-binary system, usually in the approximation of Flory,l hug gin^,^^^ and Staverman and Van Santen,4y5 which we call the FHS model.We find, by sample calculations described below, that the presence of polydispersity in on…
Abstract Mangetic bead cellulose was prepared from viscose and ferrite powder by employing the suspension procedure using the thermal sol‐gel transition. The particles thus obtained can be stirred if acted upon by an external rotary magnetic field of a common permanent magnet. Isolation of the particles from reaction…
The stress corrosion susceptibility of 25Cr–6Ni–3Mo duplex stainless steel (alloy 255, UNS S32550) in boiling 35% MgCl 2 solution has been examined in terms of the relationship between the critical cracking potential E cc for duplex stainless steel. Mill-annealed alloy 255 loaded to 90% of the yield strength in a boil…
Abstract This review article, supported by some original experimental results, explains the nature of the Cook‐Gordon (C‐G) mechanism of crack blunting. Examples are given of how the C‐G mechanism influences the toughness of several anisotropic materials: fibrillated polymeric films, composites based on oriented polym…
Shake-up lines associated with the ${\mathrm{Na}}^{+}$ [1s2p]3p atomiclike configurations in NaCl and several Na compounds have been identified in x-ray photoelectron spectra using commercial Al and Mg K\ensuremath{\alpha} sources. Two clearly separated peaks in a ratio of about 1:2 split by 4.4 eV and with a binding…
The addition of 2 at.% Ta or 1 at.% Ti into a (Nd,Dy)-(Fe,Co)-B alloy is very effective in improving room temperature coercivity and thermal stability. The Ta containing alloy shows 30% higher coercivity value than that of a Ta-free alloy at temperatures higher than 100 degrees C. Both Ta and Ti alloying greatly reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia radio frequency plasma treatment of composite-filled poly(tetrafluoroethylene) and poly(tetrafluoroethylene) laminated to copperMebrahtu G. Fessehaie, Skye McClain, Carlos L. Barton, Gwo S. Swei, and Steven L. SuibCite this: Langmuir 1993, 9, 11, 3077–3084Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structural characterization, and reactivity of the (.eta.2-benzoato)iridium(III) hydride complex [mer-(Me3P)3Ir(.eta.2-O2CC6H5)(H)][PF6]Folami T. Ladipo and Joseph S. MerolaCite this: Inorg. Chem. 1993, 32, 23, 5201–5205Publication Date (Print):November 1, 1993Pub…
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…