432. 2,2′-Bipyrrolic macrocyclic ring systems
A. W. Johnson, I. T. Kay and R. Rodrigo, J. Chem. Soc., 1963, 2336 DOI: 10.1039/JR9630002336
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The Difference Effect on Magnesium Dissolving in Acids
The difference (Δ) effect on Mg metal was measured in , , and of concentrations between 0.05 and 0.50 N at 25 °C. Generally the effect was positive, but the usual linear relationship between Δ and I existed only at low current densities and high acid concentrations. In and , the positive effect changed to negative at…
Oxidation reduction step in catalytic decomposition of hydrogen peroxide by ferric ions
M. L. Kremer, Trans. Faraday Soc., 1963, 59, 2535 DOI: 10.1039/TF9635902535
Stress Relaxation in Magnesium at Low Temperatures
Abstract Logarithmic stress relaxation in polycrystalline magnesium of 99.999% purity was studied at strains of up to 4% at 77‐295 °K. The energy barrier of 0.74 ± 0.05 eV, associated with the relaxation, was found to be numerically equal to that known to control the temperature dependence of the flow stress of magnes…
Molecular Structure of Conjunct Polymers.
ADVERTISEMENT RETURN TO ISSUEPREVArticleMolecular Structure of Conjunct Polymers.Simon Miron and Robert J. LeeCite this: J. Chem. Eng. Data 1963, 8, 1, 150–160Publication Date (Print):January 1, 1963Publication History Published online1 May 2002Published inissue 1 January 1963https://pubs.acs.org/doi/10.1021/je60016a0…
High-temperature heat content and related properties for Li2CO3, Na2CO3, K2CO3, and the ternary eutectic mixture
G. J. Janz, E. Neuenschwander and F. J. Kelly, Trans. Faraday Soc., 1963, 59, 841 DOI: 10.1039/TF9635900841
X-Ray and Density Study of Nonstoichiometry in Uranium Oxides
The lattice parameters of nonstoichiometric uranium oxides, quenched from 1100° C., were determined within the composition range UO 2 to U 4 O 9 . Two separate linear relations for the lattice parameter as a function of oxygen content were obtained: one characteristic of UO 2+x and the other of U 4 O 9-y . The two fun…
Carbon Paste Electrodes
In the course of examining new electrode systems for anodic oxidations, the carbon paste electrode was developed. This electrode has proven far more valuable than originally expected and it is the purpose of this paper to critically review its properties, applications, and shortcomings. It is fitting that emphasis be…
The Effect of Surface Orientation on the Graphitization of Diamond
Abstract The influence of crystal surface orientation on the graphitization of diamonds heated in vacuum to temperatures about 1700 °C has been studied. It was found that the rate of graphitization is highest in the 〈110〉 directions and lowest in the 〈001〉 directions.
The Oxidation of Graphite at Temperatures of 600° to 1500°C and at Pressures of 2 to 76 Torr of Oxygen
The oxidation of graphite is an interesting reaction due to its technological importance. Volatile reaction products of carbon monoxide and carbon dioxide are formed at all temperatures above 25°C. Below 800°C a small amount of surface oxide is also formed. The rate of oxidation below 800°C is limited by a chemical pr…
The Oxidation Behavior of Tantalum at 700°–1000°C
The oxidation behavior of tantalum has been studied at 700°–1000°C at oxygen pressures ranging from 1 atm to 0.01 Torr O 2 . The oxidation involves oxide formation and oxygen dissolution in the metal. The rate of oxygen dissolution is governed by diffusion of oxygen in the tantalum metal. Except for the very initial s…
Control of Al Corrosion in Caustic Solutions
In aqueous solutions of the corrosion of Al can be accelerated by chemical promoters such as S = (or SH − ) ions and/or by a thermal runaway mechanism, and inhibited by surface amalgamation, especially with ‐saturated solutions, and/or by alkyldimethylbenzylammonium salts. Corrosion is also markedly reduced at high an…
Dissolution rates of uranium dioxide sintered pellets in nitric acid systems
Abstract The dissolution process for sintered uranium dioxide into nitric acid falls into two regimes of behaviour which depend on the overall transfer rate. The critical dissolution rate is approximately 8 mg. cm. −2 min −1 , its precise value depending upon the solvent composition. Below this critical value there is…
The Thermal Conductivities of Mg[sub 2]Si and Mg[sub 2]Ge
The thermal conductivities of relatively large homogeneous samples of and have been measured in a dynamic calorimeter from 0°C to 300°C. In both samples, phonon scattering predominates, and the relationship, was observed. For , and for
INTEGRAL EQUATIONS GOVERNING RADIATION EFFECTS. (NOTES ON ATOMIC COLLISIONS, III)
A theoretica study is made of damage effects by particle radiations in mater, and their dependence on energy, mass,, and charge number of an incoming particle, as well as on the composition of the medium. Typical examples of damage effects are the number of ion pairs formed in a gas, or the number of vacancies created…
Oxidation of Boron Carbide by Air, Water, and Air-Water Mixtures at Elevated Temperatures
A study of the oxidation of boron carbide powder has shown measurable reaction at temperatures as low as 250 °C with water vapor and 450 °C in dry air. Removal of the B 2 O 3 oxidation product by water vapor occurs at a rate in excess of the oxidation rate below 550°–600°C. The presence of B 2 O 3 on the B 4 C surface…
An investigation of the structure of furfuryl alcohol polycondensates with infrared spectroscopy
Furan resins were prepared by the polymerization of furfuryl alcohol with either acid or thermal catalysis. The effect of catalysts, solvents, polymerization time, and atmosphere were studied for their effects upon the chemical structure of the polymer produced. It has been found that, regardless of the technique empl…
Thermo-photo-voltaic energy conversion
The concept of a thermo-photo-voltaic (TPV) energy converter is introduced and the device compared with thermoelectric and thermionic converters. Features of the TPV converter are that the entire device is kept at room temperature; potential power densities on the order of 10 w/cm2, and potential conversion efficienci…
An Approximate Relation Between Elastic Moduli and Thermal Expansivities
A large number of polycrystalline and amorphous materials ranging from pure metals to glassy polymers have been found to obey the relations α2E=150 [dyn cm−2°K−2]s at normal temperatures. The linear coefficient of expansion is denoted by α, Young's modulus by E, and s is a dimensionless spread factor (0.5<s&…
SILICA IN SOIL SOLUTIONS: I. THE FORM AND CONCENTRATION OF DISSOLVED SILICA IN AQUEOUS EXTRACTS OF SOME SOILS
The effects of method of equilibration, soil-water ratio, pH, and temperature on the form and concentration of dissolved silica in soil-water mixtures were studied and some hypotheses concerning the role of soluble silica in soil development were evaluated in the light of the information obtained.Studies of methods of…