Materials Literature
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The hydrogen storage compound LaNi 5 is an exchange-enhanced Pauli paramagnet with susceptibility chi (LaNi 5 )=4.6*10 -6 EMU g -1 . Hydrogen absorption leads to a decrease of the susceptibility of chi (LaNi 5 H 6.0 )=1.3*10 -6 EMU g -1 . This decrease is usually covered by a strong irreversible increase of surface ma…
Chemical and greenhouse studies were conducted to show that exchange acidity Y1, determined by titration of 125 ml of N KC1 soil extract (soil:N KC1 = 100:250) with 0.1 N NaOH, was a useful, realistic measure of aluminum toxicity potential in acid Andosols from northeastern Japan. Twenty-eight soil samples consisted o…
Based on accurate X-ray diffraction intensity data collected from spherically shaped single crystals, net atomic charges and electron density distributions have been studied for MnO, Mn2SiO4, Mg2Si2O6, LiAlSi2O6 and CaMgSi2O6. Examination of various procedures for determining atomic charges in a given structure has le…
The formation of chemically coprecipitated barium ferrite was studied using differential thermal analysis, static magnetic measurements, X‐ray analysis, and ferromagnetic resonance measurements. The investigation showed that the formation process of coprecipitated BaFe 12 O 19 differs significantly from that of conven…
It is shown that the infrared absorption band at 1230 cm−1, observed under certain conditions of oxygen precipitation in silicon, is the LO mode of SiO2. The LO mode, which is normally infrared inactive, becomes infrared active under the condition of polarization of small (<0.36 μm) platelets in an appropriate…
Cross sections for electron capture from inner shells by fully stripped ions are calculated and compared with data for $K$-shell vacancy production. A procedure for inclusion of the relativistic effect is developed, and the scheme of calculations is illustrated through sample evaluations of electron-capture cross sect…
CaCI2.4H20, P2~/c, a = 6. 1387 (9), b = 7. 6669 (12), c -: 8 . 9014 (3 7) A, fl= 111.00(3) ° , V= 391 /k 3, Z = 2, d x = 1-55 Mg m -3. The Ca atoms are surrounded by two CI atoms and four water mole- cules. The cohesion between the CaCI2.4H20 oc- tahedra is achieved by hydrogen bonds. The final R value is 0.046.
The distribution, composition and nature of concretions occurring in some moderately well-drained to poorly drained soils of Saskatchewan were investigated. The soils selected were: Gleyed Humo-Ferric Podzol, Orthic Luvic Gleysol, Orthic Gray Luvisol and Gleyed Gray Luvisol. The concretions range from < 0.1 to >…
The effects of lapped surface layers on the dielectric properties of Ba- and Sr-modified lead titanate and lead zirconate ferroelectric ceramics are examined. Specimens with lapped surfaces show anomalous dielectric behaviors, namely, smaller dielectric constant, higher Curie temperature, smaller dielectric loss (belo…
This paper discusses two types of mechanically bistable liquid-crystal display structures, a previously reported type [2], [3] called vertical-horizontal, and a second type, called horizontal-horizontal. In both of them, the director configuration is planar. They are distinguished by the orientation of the director pl…
The fracture toughness of stoichiometric polycrystalline MgAl 2 O 4 was measured as a function of grain size and temperature to 1400°C. The room temperature fracture toughnesses are comparable to reported single‐crystal values. No effect of grain size was detected. Two regions of K I c = f ( T ) were observed, both sh…
Observations have been made which indicate that blister formation is a general step in the pit initiation process in aluminum in aqueous chloride solutions. Evidence is presented which clearly shows that the oxide film is overtly broken by the mechanical stress resulting from the gas pressure in such blisters. The ste…
Abstract Ternary and quaternary, mostly coloured compounds of Au, Pd and Pt, resp., with Li, Mg, Sc and Sn were prepared and structurally investigated. They crystallize in a "filled" Zinkblende type structure (space group F?3m) and can be characterized as ternary or quaternary Zintl-phases. Colours seem to depend on u…
We have investigated the liquid crystal molecular orientation on a surface coated by oblique evaporation of SiO followed by treatment with homeotropic surface coupling agents. This is found to be a useful technique for obtaining the liquid crystal orientation with a small pretilt from homeotropic alignment. The orient…
Oxygen diffusion coefficients in undoped and La-doped polycrystalline barium titanate were measured at an ambient oxygen pressure of about 40 Torr over the temperature range 770–1430 °C by a solid–gas exchange technique of O18. The undoped material was characterized only by an extrinsic region with a high diffusivity,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of photoelectrochemical corrosion of semiconductors. 1K. W. Frese Jr., M. J. Madou, and S. R. MorrisonCite this: J. Phys. Chem. 1980, 84, 24, 3172–3178Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 Nov…
Silicate uptake by Nitzschia alba cells is higher in medium containing Na(+) than in media lacking Na(+) but containing K(+), Rb(+), NH(4) (+), Li(+), or choline(+). The initial rate is inhibited by monensin and gramicidin but not by valinomycin or nigericin and is less sensitive to inhibition by carbonyl cyanide m-ch…
The hexagonal ferrite W=BaFe2+2Fe3+16O27 has a saturation magnetization about 10% higher than the widely used permanent-magnet material M=BaFe3+12O19 and the anisotropy field is about equal. This opens up the possibility of using W as a permanent-magnet material with a higher remanence Br and energy product BHm. This…
The small differences in thermal expansion behavior between stoichiometric cordierites fabricated by different methods were measured using an XRD film method which records the complete diffraction patterns, at two temperatures, on one film. Examples of the extensive chemical family that can be obtained with this struc…
The dc conductivity and ionic transference number of MgO single crystals doped with Al, Fe, and Sc were measured as a function of temperature (1200° to 1600°C) and oxygen pressure (10 −1 to 10 −13 MPa). Magnesium oxide is a mixed conductor with its ionic component directly proportional to the trivalent solute concentr…