Materials Literature
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Anorthite CaA12Si20 s has the same point group, I, as a simple felspar, but four times the volume per lattice point; its unit cell is primitive, with a 14 Jk c-axis, while that of albite, for comparison, is C-face-centred with a 7 A c-axis.Anorthite approximates much more closely to a C-face-centred cell with a 14 A c…
1. Free glycerol was identified as a major carbohydrate component of the dormant cysts of Artemia salina. 2. The amount of glycerol present in cysts aged for a year in the dry state was found to be about 5% of the cyst weight, and was shown to be restricted to the embryonic part of the cyst. 3. Glycerol content decrea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Some N-Aryl Hydroxamic Acids.S. G. Tandon and S. C. BhattacharyyaCite this: J. Chem. Eng. Data 1962, 7, 4, 553–555Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue 1 October 1962https://pubs.…
The steady‐state creep behavior of polycrystalline aluminum oxide from 97 to 100% dense has been examined at temperatures from 1600° to 1800°C over a range of stresses from 100 to 2000 psi under four‐point transverse bending. Grain size is shown to have an important effect on the deformation behavior. Stress‐strain ra…
Magnetization reversal at an angle to the easy direction in Ni-Fe films was studied. The results, in contrast to the single-domain theory, show no coherent rotation, even for field directions in which the critical field for rotation is smaller than the critical field for wall motion. The actual reversal is initiated b…
New values are presented and discussed for the thermal conductivities and electrical resistivities of ruthenium, osmium, rhodium, iridium, palladium and platinum over the approximate temperature range 80° to 500°K.
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Action of Raney Nickel on Organic Sulfur Compounds.Heinrich. Hauptmann and Wolfgang Ferdinand. WalterCite this: Chem. Rev. 1962, 62, 5, 347–404Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue 1 October 1962https://pu…
It has been reported that SrTiO₃/ becomes ferroelectric below about 50 deg K. When SrTiO₃ is compared with well known ferroelectrics such as BaTiO₃, remarkable contrasts are found in their dielectric properties. The dielectric constants are examined in three directions: STA110!, STA111!, and STA100!. (W.D.M.)
The density, refractive index, molar refractivity, and infrared absorption spectra of soda aluminosilicate glasses containing up to 34.8 wt% alumina have been determined. Changes in these properties with composition can be explained by existing theories which assume that the aluminum ions form only A10 4 tetrahedra wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ADSORPTION-FLOCCULATION REACTIONS OF A POLYMER WITH AN AQUEOUS COLLOIDAL DISPERSIONThomas W. Healy and Victor K. La MerCite this: J. Phys. Chem. 1962, 66, 10, 1835–1838Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue…
The possibility of the rotation of a subgrain with respect to its neighbors as a natural process during recrystallization is analyzed thermodynamically and kinetically. It is found that it is energetically possible if the direction of rotation favors the elimination of low-angle boundaries over that of high-angle boun…
Static pressure apparatus has been developed which is capable of pressures up to 200 kbar and transient temperatures up to about 5000°K, using an electric flash‐heating technique. At pressures above about 125 kbar and temperatures in the 3000°K range it is found that graphite spontaneously collapses completely to poly…
Abstract An investigation has been made of the friction and wear of hard solids such as sapphire (Al2O3), rutile (TiO2), TiC, SiC, diamond and fused silica (SiO2) sliding on metal surfaces at very high speed (700 m/s). It is shown that hard solids can undergo extensive wear when rubbed against metals of much lower har…
The process of variable transmission in silicate glasses has been accomplished by optically pumping color centers by electron transfer from europium (II) or cerium (III) which absorb sunlight at higher energies than the color center. Absorbed energy quickly pumps the visible color center band to a maximum. Upon remova…
Reported values of the $K$ x-ray fluorescence yield of argon lie in two distinct groups, viz., low values (about 0.07) and high values (about 0.13). A new measurement herein reported gives 0.14\ifmmode\pm\else\textpm\fi{}0.014. This measurement was made from the "escape peak" in the pulse-height distribution of a flow…
Two photosensitive electron paramagnetic resonance signals A and B are found in self-activated ZnS phosphors of polycrystalline form. Both these signals appear at 77°K when illuminated with uv light, and can be quenched with visible light of longer wavelength. The center responsible for the A signal is a hole trap and…
An appreciable number of magnetic materials with the spinel structure exhibit tetragonal symmetry, rather than cubic, in their x-ray diffraction patterns. Because of the distortion, five different nearest-neighbor exchange interactions are possible, so that four ratios ($t, u, v, \mathrm{and} w$) amongst these interac…
Using the specific heats of completely crystalline polyethylene as a basis, the vibrational spectrum is discussed. The vibrational spectrum is found to consist of three completely separate parts. (A) The high-frequency CH2-stretching vibrations between 2850 and 2930 cm—1 which contribute little to the specific heat be…
Data for the specific heat of polyethylene as a function of crystallinity are collected from 1° to 420°K. Specific heats, entropies, and enthalpies of the completely amorphous and crystalline polyethylene are extrapolated. The glass transition is located for the amorphous at 237°K with a ΔCp of 2.1 cal deg—1 (mole CH2…