Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The period of out-of-step of ordered alloys with anti-phase domain structure, measured in atomic distance, is generally not an integer, in spite of sharp splits of superlattice reflections. This fractional property of the period has theoretically been examined. The general treatment of this problem has shown that a re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of Self-Consistent Molecular Orbital Methods to π-ElectronsJ. A. PopleCite this: J. Phys. Chem. 1957, 61, 1, 6–10Publication Date (Print):January 1, 1957Publication History Published online1 May 2002Published inissue 1 January 1957https://pubs.acs.org/doi/10.1021…
Samarium oxide forms a ceramic of medium strength and density (6.0) when it is fired at 1300°C. When it is fired at 1500°C., its density is increased to 7.4 but it loses its stability toward boiling water. X‐ray data are given concerning the structure of the oxide as received and at 1300°C. and of the reaction product…
Consideration of corrosion in the presence of water has led to the postulation of damage by hydrogen produced in the reaction. For cases where the metal surface is covered with a protective layer, it is considered that some hydrogen ions diffuse through the layer and form hydrogen atoms beneath it. The consequence of…
Experiments are reported in which novel results are found on the magneto-resistance of sodium and rubidium. Measurements have been made both on plate-like specimens which show very strong anisotropy in the magnetic field, and on a cylinder of diameter large comparedwitli the mean free path, ι, of the electrons. The an…
The electrodeposition of Mg from ether solutions of such Mg compounds as ( a ) halides, ( b ) aluminohydrides, ( c ) borohydrides, and ( d ) Grignard reagents was investigated. White, metallic deposits containing 90% Mg and 10% B were obtained from an ether solution of and . However, thick deposits could not be built…
Summary A heat-labile, nondialyzable factor with nerve growth-promoting properties has been partially purified from Sarcoma 180. The data indicate that the active material is a protein or is bound to a protein and that nucleic acids are not involved in its effectiveness. The factor must be continuously present in the…
Abstract not Available.
P. L. Allen and A. Hickling, Trans. Faraday Soc., 1957, 53, 1626 DOI: 10.1039/TF9575301626
Low‐pressure solubilities were determined for H in α‐ and β‐Zr and in two Zr‐O alloys at 700°–1000°C and pressures of 0.1–4 µ Hg. The data followed Sieverts' law for each phase, and H solubility decreased with increasing temperature at a given pressure. Also, there was a slight increase in H solubility in α ‐Zr with i…
A Monte Carlo method is used to estimate the frequency functions of various angles in a random aggregate of cubic crystals. Estimates are made of the frequency function for the angle of disorientation, i.e. the least angle of rotation required to rotate a crystal into the same orientation as a neighbouring crystal, an…
The permeation process consists of the steps: adsorption, solution, diffusion, and desorption. These are discussed for glasses, polymers, and metals. There are two generalizations: (1) All gases go through all polymers. (2) No rare gas permeates any metal. Criteria are given for measurements of the permeation process.…
The first page of this article is displayed as the abstract.
Abstract not Available.
Anderson's treatment of super-exchange yields a qualitative rule for the dependence of interaction on angle Me—O—Me. Using this rule, and assuming a longer distance to lead to a weaker interaction, low-temperature saturation magnetizations for ferrimagnetic oxides with known crystal structures can often be predic…
Abstract not Available.
A semiempirical method for the determination of mass absorption coefficients for the very soft x-ray region of 5 to 50 A is described. A universal function for the absorption by K-shell electrons and another for absorption by L and extra-L shell electrons are given in table form to permit the calculation of mass absor…
R. K. Hart, Trans. Faraday Soc., 1957, 53, 1020 DOI: 10.1039/TF9575301020
The oxidation‐reduction kinetics of the ferrous‐ferric sulfate system have been measured on a stainless steel surface. The data completely support theoretical equations which describe the potential‐current relationships for such a system. The analysis applies to reversible electrodes and to corroding electrodes where…
The titanium--oxygen system has been studied by means of x-ray powder photographs of preparations quenched after annealing at various temperatures. A number of phases not previously described has been observed, viz., Ti/sub 2/O, TiO (low-temperature modification), Ti/sub 4/O/sub 7/, Ti/sub 5/O/su b 9/, Ti/sub 6/O/sub…