Materials Literature
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Monoenergetic electrons of energies from 3.2 to 14 MeV provided by a linear accelerator have impinged normally on thick solid targets. Backscattered electrons have been detected by an ionization chamber, the multiplication factor of which was calibrated with a Faraday chamber as a function of average energy per backsc…
The observation of internal field emission (Fowler-Nordheim tunneling) in magnetically ordered insulators is reported. A large magnetic field effect was observed and interpreted as a decrease in the barrier height due to spin ordering.
Abstract A range of dense well oriented graphites of high chemical purity has been prepared by stress recrystallization of pyrolytic material. Systematic trends in the galvanomagnetic and thermoelectric properties have been investigated in relation to c-axis distribution function, crystallite size, and basal plane dis…
The firm with which the author is associated has been using shellac-bonded micafolium for insulating the stator windings of high-voltage rotating machines since 1910, and also, from 1930 onwards, asphalt-bonded micafolium, though largely for higher-voltage machines. Both systems follow European practice in that the re…
A structural investigation of dufrenoysite has been carried out. There are two chemical units of Pb 8 As 8 S 20 in a unit cell. The space group is C 2 2 – P 2 1 , and the unit-cell constants are a = 7.90 Å, b = 25.74 Å, c = 8.37 Å, β = 90°21′. The main structure is the same as that of rathite-I, rathite-Ia and rathite…
Temperatures of boiling magnesium chloride solutions used to detect susceptibility of austenitic stainless steels to stress corrosion cracking have a pronounced effect on the time to failure of these alloys. Available atmospheric boiling point data for solutions in the range 0-46 wt/% MgCl2 have been assembled and sup…
Abstract Die Systeme MgONb 2 O 5 und MgOTa 2 O 5 wurden erneut untersucht. Neben den bekannten Niobit‐ und Co 4 Nb 2 O 9 ‐Phasen konnten die Phasen Mg 5 Nb 4 O 15 und Mg 5 Ta 4 O 15 erhalten werden, die in einer Überstruktur des Pseudobrookites mit dreifacher Elementarzelle kristallisieren. In Analogie zu TiAl 2 O 5…
Fornacite, Pb 2 (Cu,Fe)[CrO 4 (As,P)O 4 OH], is monoclinic, with a = 8.101 Å, b = 5.893 Å, c = 17.547 Å, β = 110°00′, space group P 2 1 / C . After making spherical absorption and Lorentz-polarization corrections, a three-dimensional Patterson synthesis was computed and the heaviest atoms located. The oxygen positions…
A definition of “free” or maximum unoccupied volume, f = 1 — da/dc, is presented where da and da are the densities of the amorphous and ideally crystalline phases of a glassy amorphous polymer. This definition was combined with the well-known hypothesis that drawing a glassy polymer introduces free volume. With the fu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium pressures of hydrogen dissolved in .alpha.-zirconiumFranco Ricca and Tiziano A. GiorgiCite this: J. Phys. Chem. 1967, 71, 11, 3627–3631Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 October 1967https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and nuclear magnetic resonance studies of some tin phthalocyanines and hemiporphyrazinesLaurel E. Sutton and Malcolm E. KenneyCite this: Inorg. Chem. 1967, 6, 10, 1869–1872Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Publishe…
The effect of heat treatment of trans-1,4-polybutadiene single crystals prepared from dilute benzene solution was studied by dilatometry, X-ray diffraction, and dynamic viscoelastic measurement. The crystal transformation temperature of the single crystal is 55.5[ddot]C, 20[ddot]C lower than that of the bulk crystalli…
Abstract The factors contributing to the selective permeation of water and sodium chloride through cellulose acetate membranes have been examined by the use of radioactive tracers. With decreasing acetyl content both the partition coefficient (solubility) and diffusion coefficient of water increased, the latter the mo…
A striking change in coherence is obtained when single-crystal platelets of linear polyethylene are recrystallized by annealing at temperatures between 120°C and the melting point, 137°C. Instead of showing micaceous cleavage, the sintered crystal mat is ductile and malleable in shear, yet still will not flow under co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of bismuth halide complex salts. I. 2-Picolinium tetrabromobismuthate(III) and tetraiodobismuthate(III)Bobby Ken Robertson, W. Gant McPherson, and Edward A. MeyersCite this: J. Phys. Chem. 1967, 71, 11, 3531–3535Publication Date (Print):October 1, 1967Publ…
1. N-Acetylglucosamine 6-phosphate deacetylase and 2-amino-2-deoxy-d-glucose 6-phosphate ketol-isomerase (deaminating) (EC 5.3.1.10, glucosamine 6-phosphate deaminase) of Escherichia coliK(12) have been separated by chromatography on DEAE-cellulose. 2. N-Acetylglucosamine 6-phosphate deacetylase has optimum pH8.5 and…
Photoluminescence emanating from ``pure'' high resistivity SrTiO3 has been examined between 4000 and 13 000 Å as a function of temperature and 3650 Å irradiation. One strong narrow peak (7929 Å at 95°K; half-width ≤1 Å) and 9 associated peaks (7852, 8005, 8051, 8098, 8280, 8304, 8469, 8574, 8726 Å), each of which exhi…
A model is presented to explain premature fracture of titanium- boron composites as a result of interaction to form titanium boride. Three failure modes are identified. The titanium boride cracks at a strain of 2500 x 10 -6 but the cracks result in a smaller stress concen tration than the preexisting flaws in the boro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry and synthesis of .alpha.-agarofuranH. C. Barrett and George. BuechiCite this: J. Am. Chem. Soc. 1967, 89, 22, 5665–5667Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 October 1967https://doi.org/10.102…
Absorption spectrum of RbMnF3 crystal has been studied at room temperature and at 77°K. The observed band positions are fitted with four parameters, B, C, Dq, and α, and the values of the parameters for the 77°K spectrum are 840, 3080, 780, and 76 cm−1, respectively. The shift in band positions on reducing the tempera…