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The optical spectra of the alkali halides are divided into interband scattering and exciton structure. The scattering or direct-transition structure is shown to be similar to that of the zincblende crystals studied in earlier papers of this series. On this basis the band structure $E(k)$ is deduced empirically from th…
Received 3 November 1964DOI:https://doi.org/10.1103/PhysRevLett.13.688©1964 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChlorinated Xylene Derivatives for Flame-Retardant Rigid Polyurethane FoamsF. B. Slezak, J. P. Stallings, and Irving RosenCite this: Ind. Eng. Chem. Prod. Res. Dev. 1964, 3, 4, 292–294Publication Date (Print):December 1, 1964Publication History Published online1 May 2002Publ…
Cancrinites of compositions 3NaAlSiO 4 XCaCO 3 ,3NaAlSiO 4 XCa(OH) 2 and 3NaAlSiO 4 XK 2 O 3 were made in the 200 degrees to 800 degrees C range at 10,000 to 30,000 psi of water pressure. The first two compositions did not dissociate at upper pressure and temperature limits but the third composition dissociated to nep…
The vapor pressure of plutonium dioxide (PuO 2 ) was investigated in the range 1450° to 1775°C in air, argon, and oxygen atmospheres by a transpiration technique. There were strong indications that PuO 2 can vaporize congruently or as a suboxide species, depending on the atmosphere. The δH° 298 for vaporization in 1 a…
Several routes to the synthesis of 1,4-disubstituted bicyclo[2.2.2]octanes have been explored and the syntheses of several such derivatives are reported. The 1,4-disubstituted bicyclo[2.2.2]-octane nucleus could not be prepared through an elimination reaction on a corresponding 2,5-disubstituted derivative or by the D…
By using the double resonance method, transitions F =5→ F =4 and F =3→ F =2 are measured for 7 2 P 3/2 and 8 2 P 3/2 states of Cs 133 atom ( I =7/2). Frequency shifts proportional to the input power are observed. In order to compare with the experiment, the theory of frequency shift due to radiation is generalized to…
Irradiation of dibenzoylmethane in benzene gives tribenzoylethane. In more concentrated solution a solid dimer (II) separates which, on solution, is converted by dealdolization into an isomer. This isomer (I, R = H) on irradiation, gives tribenzoylethane in a photolytic reaction which has been shown to have some gener…
A study was made of cavitation induced in water at the center of a 12-liter spherical resonator at a frequency of 25 kc/sec. For water degassed so that the equilibrium air pressure above it was less than 4 mm Hg, the threshold was found to be 9±3 atm, provided that the sound field was not radically different from an i…
The volatility of UO 2±x and the phase relations in the system uranium‐oxygen were studied using thermogravimetric techniques. Chemical reactions describing the loss of uranium from UO 2±x at temperatures between 1100° and 2200°C in oxygen pressures between approximately 10 2 and 10 −6 torr are proposed. Results were…
Research Papers The Influence of Mean Stress on the Mechanical Hysteresis Loop Shift of 1100 Aluminum L. F. Coffin, Jr. L. F. Coffin, Jr. Research Laboratory, General Electric Company, Schenectady, N. Y. Search for other works by this author on: This Site PubMed Google Scholar Author and Article Information L. F. Coff…
The elastic modulus and transverse bend strength of pure, dense magnesia were determined as a function of grain size (1 to 190μ) and temperature (30° to 1500°C). The elastic modulus was essentially independent of grain size over the temperature range covered. The transverse bend strength for magnesia revealed a 1/6 po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSamarium and Lanthanum Tungstates of the 3R2O3.WO3 TypeLuke L. Y. Chang and Bert PhillipsCite this: Inorg. Chem. 1964, 3, 12, 1792–1794Publication Date (Print):December 1, 1964Publication History Published online1 May 2002Published inissue 1 December 1964https://doi.org/10.1…
Abstract VO 2 und NbO 2 bilden eine Rutilphase (V 1−x Nb x )O 2 . Der tetragonale Bereich erstreckt sich von x = 0,1 bis ∼0,9. Aus Suszeptibilitätsmessungen und Messungen der elektrischen Leitfähigkeit folgt, daß die Rutilphase sich aus den beiden Mischkristallreihen (V V Nb )O 2 mit 0 < x < 0,5 und (V Nb Nb )O…
Infrared absorption spectra are shown for monoclinic ZrO 2 and for cubic stabilized ZrO 2 . Nine bands are reported in monoclinic ZrO 2 in the region 800 to 200 cm −l , whereas only one broad band is observed in cubic ZrO 2 over the same frequency range.
A method was developed for hot‐pressing 80 to 95% dense, polycrystalline specimens of commercially available, unstabilized, monoclinic zirconia. The elastic moduli of these specimens were measured by a sonic method in the range 25° to 1000°C. Application of mathematical expressions developed for the porosity dependenc…
The low-energy electron impact desorption of CO adsorbed on W has been investigated by means of a field emission technique. It was found that the previously postulated binding modes of CO could be distinguished and confirmed by their differing desorption cross sections which are σvirgin=3×10—19 cm2, σvirgin to β≥10—19…
The activity of zirconium in the tetragonal ZrO 2 phase was measured at 2200° to 2300°K as a function of composition by studying the reaction image From the variation of the zirconium activity with composition, the pairwise interaction energy E 11 between vacancies in the oxygen lattice was evaluated at ‐4.6 ± 1.0 kca…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation L. B. Leder, M. E. Lasser, D. C. Rudolph; ATTENUATION OF PHOTOEXCITED ELECTRONS IN Cu AND HOLES I…
The model (for predicting Curie temperatures of ternary alloys) developed in a previous paper is extended by removing the assumption that the fraction of plus and minus spins contributed by an element in the alloy is directly proportional to the concentration of the element. Empirical data concerning the Curie tempera…