Materials Literature
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β-Zn 3 (PO 4 ) 2 crystallizes in the monoclinic space group P 2 1 /c with lattice parameters, a = 9.393(3) Å, b = 9.170(6) Å, c = 8.686(3) Å, β = 125.73(10)°, and Z = 4. The three independent cations are strongly ligated to 4, 5, and 5 oxygen atoms, with average Zn—O bond distances of 1.98 ± 0.09 Å, 2.10 ± 0.10 Å, and…
The paramagnetic resonance spectra of Mn2+ ions in glasses and compounds of the lithium borate system have been investigated at 9.1 and 35 GHz. The spectrum for the Li2O·4B2O3 compound is found to exhibit six very sharp hyperfine lines centered on g=3.3 when observation is made at X band, while at 35 GHz the center of…
Dynamic polarization of fluorine nuclei has been examined with 14 free radicals dissolved in hexafluorobenzene (C6F6) and 1,1,1-trifluoro-2,2,2-trichloroethane (CF3CCl3). The radicals may be broadly grouped by their tendency to produce either positive or negative fluorine NMR enhancement. A large positive enhancement…
Near-normal incidence-reflectance data on vacuum-evaporated white tin films, produced in situ, are presented for incident photon energies from 2.1 to 14.5 eV. In addition, the real part of the refractive index has been measured from 14.5 to 20.5 eV by the critical-angle method. These results are combined with previous…
The enthalpy of formation and absolute entropy of AlH3 at 298.15°K have been measured as −2.73±0.20 kcal/mole and 7.18±0.10 cal/(mole·°K), respectively. The derived Gibbs energy of formation at 298.15°K of 11.11±0.23 kcal/mole indicates AlH3 is unstable with respect to decomposition to the elements.
With a free-electron model for the conduction band, the isotropic and first-order nonisotropic terms of the indirect exchange interaction in the rare-earth metals have been calculated exactly (in second-order perturbation). The results are compared with previous treatments of the problem, all of which utilize some typ…
Measurements were made of the free-induction-decay (FID) and spin-echo amplitudes of ${\mathrm{Fe}}^{57}$ in pure Fe and some of its alloys. Complex spectra are observed consisting of many oscillations often covering a range of many Mc/sec. The amplitudes are very dependent on the pulse length $\ensuremath{\tau}$, the…
Abstract Das Verdampfungs‐Gleichgewicht des Zweistoffgemisches Ameisensäure/Essigsäure wurde bei 760 Torr sowie bei vermindertem Druck (100 und 30 Torr) gemessen. Da die relative Flüchtigkeit beim Übergang von 760 auf 100 Torr beträchtlich, beim Übergang auf 30 Torr nur noch mäßig ansteigt, erscheint eine Trennung bei…
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…