Materials Literature
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The monovacancy formation enthalpy in copper, H 1v F =(1.30+or-0.05) eV, has been measured using precision electrical resistometry on samples quenched from temperatures in the range 525-650 degrees C. Comparison of this value for H 1v F with the activation enthalpy for self-diffusion via a monovacancy mechanism in cop…
Packing patterns in lanthanide–edta complexes: crystal and molecular structures of sodium triaqua(ethylenediaminetetraacetato)dysprosate(III) pentahydrate and caesium diaqua(ethylenediaminetetraacetato)ytterbate(III) trihydrate
Experiments were performed to determine susceptibility of 90/10 and 70/10 Cu-Ni alloys to sulfide induced corrosion as related to sulfide concentration, sea water velocity, and duration of sulfide exposure. All exposures were conducted in fresh sea water, and the range of experimental variables included sulfide concen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron reduction of aromatic nitrogen heterocycles in aqueous solution. 2,2'-Bipyridine and 1,10-phenanthrolineQ. G. Mulazzani, S. Emmi, P. G. Fuochi, M. Venturi, M. Z. Hoffman, and M. G. SimicCite this: J. Phys. Chem. 1979, 83, 12, 1582–1590Publication Date (Print):Ju…
The nematic-smectic transition in the system of completely aligned hard cylindrical rods is investigated, by making use of the method of symmetry breaking potential. In the second virial approximation the transition is found to occur in the 3-dimensional system but not in the 1- and 2-dimensional systems, in contrast…
Superstructures of submonolayer films of indium on a clean silicon (111)7 surface have been investigated using techniques of molecular-beam deposition and reflection high-energy electron diffraction. A two-dimensional phase diagram including four superstructures, 7, (3)1/2, (31)1/2, and 4×1, are presented at substrate…
The structure—property relationships of (AB)n type segmented copolymers and methods of characterization are reviewed. The two-phase microstructure exhibited by segmented elastomers, resulting from thermodynamic incompatibility of the unlike blocks, is seen to depend on segment type, segment length, segment compatibili…
Abstract Two bands attributed to intrinsic defect states have been identified through studies of the infra-red and Raman spectra of pristine and neutron-irradiated vitreous (v-) SiO2. Vibrations in the 900–950 em−1 regime are assigned to non-bridging oxygen atoms (C1-) in agreement with previous studies. It is demonst…
Abstract Several series of alkali (sodium and potassium) aluminophosphate glasses were prepared with compositions of 32–63 mol % of P2O5 and the properties of these glasses were determined. In the glasses with a higher P2O5 content (P2O5\gtrsim42.5 mol % in the Na2O–Al2O3–P2O5 glass and P2O5\gtrsim45 mol % in the K2O–…
ABSTRACT Navicula ulvacea (Berkeley ex Kütz.) P. T. Cleve, a marine colonial blade‐forming diatom originally discovered in Scotland was collected at North Rustico, Prince Edward Island, during winter 1971. It formed dense stands of Porphyra‐ like fronds, ranging up to 60 mm long × 20 mm wide. These occurred under ice‐…
The new compound K 5 CuSb 2 crystallizes in the space group R3̄m with the constants a = 591(2) pm, c = 2814(4) pm, c/a = 4.76. There are linear (Sb-Cu-Sb) 5- groups in the structure which are isoelectronic to the HgCl 2 molecule.
Abstract BaTeO 3 tritt in zwei Modifikationen auf. Einkristalle beider wurden aus Schmelzen von BaCO 3 mit TeO 2 präpariert und röntgenographisch untersucht. Für die schon bekannte monokline Form BaTeO 3 (I) wurde die reduzierte Zelle bestimmt: a = 463,3(4), b = 594,3(5), c = 710,4(5) pm, β = 106,4(1)°, Z = 2, Raumgru…
Abstract Commonly used thermal process calculations are based on temperature differences. An improved method of calculation based on sterilizing ratios is described. This method is independent of the temperature scales used, and reduces the number and size of associated tables. The integration limits were able to be s…
Abstract The temperature dependence of the luminescence spectra and of the emission lifetimes are measured in KBr:In + . From these results detailed information is obtained on the adiabatic potential energy surface of the relaxed excited state.
Ellipsometry has been used to follow the oxidation of the (111) face of a copper single crystal at 21 °C for oxygen pressures from 0.03–760 Torr. The pressure dependence is complex, with the short term oxide film thickness increasing to a limiting value as pressure increases, whereas the long term thickness goes throu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal tetrathiolenes. 4. Synthesis, characterization, and electrochemistry of new discrete diplatinum-tetrathiolene complexesBoon-Keng Teo and P. A. Snyder-RobinsonCite this: Inorg. Chem. 1979, 18, 6, 1490–1495Publication Date (Print):June 1, 1979Publication History Publishe…
The paper describes a very-low-frequency (VLF) high-voltage test facility and includes the results of partial-discharge (corona) measurements undertaken on samples of electrical machine insulation. The samples were energized by means of a high-voltage generator, capable of producing alternating Voltages from 0.1 Hz up…
After a brief survey of the mechanism of cellulose acid hydrolysis and the influence of the structure of cellulose on the reaction rate under heterogeneous conditions, thermohydrolysis, hydrolysis by dilute acid, and enzymatic degradation are compared with regard to the influence of the structure of cellulose. Cotton…
Abstract UV-visible light absorption spectra of dilute suspensions of standard and commercial montmorillonites (bentonites) and of nontronite, hectorite and pyrophyllite, were studied. All montmorillonites exhibit either an absorption band or a shoulder at a wavelength of 245 nm. The absorption peak for nontronite is…
Abstract From equilibrium silica concentrations over imogolite and boehmite at 100–155°C, the heat and free energy of the reaction (HO) 3 Al 2 O 3 SiOH + H 2 O ⇌ 2AlOOH + Si(OH) 4 have been obtained: Δ H ° r (298·15 K)=38·6 ± 4·1, Δ G ° r (298·15 K) = 26.8 ± 1·1 kJ mol −1 , and hence the heat and free energy of format…