Materials Literature
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A capillary dilatometer has been automated by means of a capacitive transducer technique. The precision is 1 : 105 over a range in volume of 4% for a sample volume of 2 ml. Differential scanning dilatometry is achieved by comparing the sample dilatometer with a reference dilatometer. Some results for the density chang…
The effect of aging on the microstructures of Sm-Co-Cu alloys is reported. It is shown that small precipitates are present within the SmCo5-type phase in as-cast material. On aging below 650 °C these precipitates are exceptionally stable, but at 800 °C they coarsen rapidly. These results are rationalized in terms of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese Schiff base complexes. 7. Synthesis and circular dichroism of optically active tetradentate chelates of manganese(III) and of .mu.-oxo-.mu.-hydroxo-dimanganese(III,IV) dimersL. J. Boucher and C. G. CoeCite this: Inorg. Chem. 1976, 15, 6, 1334–1340Publication Date (…
Completing sour gas wells with materials that possess innate corrosion resistance may be more practical than to attempt chemical corrosion inhibition of steel alloys. A program of screening tests determined that alloy systems containing large amounts of nickel, cobalt, chromium, and molybdenum have exceptional corrosi…
The measurement of dielectric strengths is generally beset with numerous difficulties, and results depend to a large extent upon experimental conditions and sample geometry. The development of so-called cylindrical samples, in which spherical electrodes are almost completely embedded in the dielectric to be measured,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of copper citrate dihydrate, Cu2C6H4O7.cntdot.2H2ODonald. Mastropaolo, Dana A. Powers, Joseph A. Potenza, and Harvey J. SchugarCite this: Inorg. Chem. 1976, 15, 6, 1444–1449Publication Date (Print):June 1, 1976Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe effect of crystal packing and defects on desolvation of hydrate crystals of caffeine and L-(-)-1,4-cyclohexadiene-1-alanineStephen R. Byrn and Chung-Tang LinCite this: J. Am. Chem. Soc. 1976, 98, 13, 4004–4005Publication Date (Print):June 1, 1976Publication History Publi…
The naturally occurring toxin L-2-amino-4-methoxy-trans-3-butenoic (AMB) acid irreversibly inhibits pyridoxal phosphate-linked aspartate aminotransferase. The inhibitor is a substrate for the enzyme, and as such is converted into a highly reactive intermediate which chemically reacts with an active site residue, thus…
The limiting low-frequency permittivity of ice VI at a pressure of about 9 kbar has been measured between 301 and 128 °K to seek evidence for an ordering transformation. In the experimental range, the quantity (ε0 −ε∞) T, where ε0−ε∞ is the orientation polarization, increased by a factor of 1.49, and follows a Curie–W…
An explanation of frictional electrification is suggested and experimentally proved. Because of the presence of structural imperfections, solid insulators are not electrically neutral. Under normal conditions the 'intrinsic' electric field of an insulator is compensated for by ions absorbed from air. Friction of one b…
Measurements of the spin-lattice relaxation rates in the group-III-V compounds, GaAs, GaSb, InAs, and InSb, are presented as a function of temperature from 4 to 300 K. These rates, except for GaSb, are separated into magnetic and quadrupolar parts. The quadrupolar rates are separated into relaxation by acoustic phonon…
The Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientations of the longitudinal or quasi-longitudinal phonon vector q ; (1) q // c -axis, (2) q // b -axis and (3) q deviates 5° from b -axis in the (100) plane. The te…
Abstract In the second part of this paper on the kinetics of crystallization of aluminum trihydroxide from caustic aluminate solutions, interest is specially focused on the analysis of crystal size distribution as a function of time, in an isothermal batch crystallizer. Breakdown and agglomeration are shown to affect…
In this paper methods and results of three-dimensional electron microscopy of individual molecules will be presented. Part I describes the general experimental and theoretical methods (microgoniometer, measuring scheme, two-dimensional and three-dimensional reconstruction, determination of the common origin of the pro…
The effect of changes in pH and the presence of ligands on the uptake of copper ions by an illite and a montmorillonite type clay has been investigated. The observed adsorption behaviour on montmorillonite can be interpreted in terms of an ion exchange model, i.e. all positively charged solution species compete for av…
Calculations of the vibrational spectra of continuous random network models of tetrahedrally bonded amorphous semiconductors are presented. Nearest neighbour central and non-central force constants are used. The results show that the shape of the TO-like peak of the spectrum depends on both the topology and bondangle…
Electrical conductivity and thermopower measurements on single crystals of Pt(NH3)4PtCl4 (MGS) and (TTF) NiS4C4H4 (TTF = tetrathiafulvalene) illustrate the application of electrical property measurements to the study of intermolecular interactions and electronic structure in planar metal complex systems. MGS is an ani…
High-energy oxygen ions (400 keV <E<3.6 MeV) are used to obtain a semi-insulating (SI) layer. Our objective is to determine the location of the above-mentionned SI layer in the substrate and its thickness, on one hand, and the influence of the carrier concentration and that of the doping impurity on the…
Direct measurement of the solubility of calcite in seawater is difficult and irreproducible because of kinetic factors that inhibit the attainment of true, reversible equilibrium. To avoid this problem, the solubility product constant for calcite in seawater was determined in the present study by calculation from new…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTYield and decay of the hydrated electron from 100 ps to 3 nsC. D. Jonah, M. S. Matheson, J. R. Miller, and E. J. HartCite this: J. Phys. Chem. 1976, 80, 12, 1267–1270Publication Date (Print):June 1, 1976Publication History Published online1 May 2002Published inissue 1 June 1976h…