Materials Literature
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The nature of the minimum energy configuration of jogs of various lengths in dislocations in face-centred cubic metals is studied. It is concluded that long jogs of various types are partially dissociated into intrinsic stacking-fault ribbons on close-packed planes, and that elementary jogs in dislocations in a range…
Since the theoretical foundations of radial distribution analysis of liquid diffraction patterns were laid in 1927 by Zernike and Prins, progress in apparatus and experimental techniques has ensured a greater reliability and hence a greater confidence in the method as a means of evaluating the structure of liquids. A…
On calcule la polarisation de charge (ou de spin) induite en un point B dans un alliage au voisinage d'une impureté A en tenant compte de la diffusion des électrons par d'autres impuretés (réparties au hasard) entre A et B. Les applications possibles de ce calcul comprennent : 1) La discussion des facteurs de forme ma…
Existing knowledge of point defects and their interactions in uncolored alkali halide crystals is briefly reviewed. Attention is drawn to recent experimental and theoretical work which indicates that vacancy pairs are not highly mobile defects. This has important implications for some hypotheses on the kinetics of col…
The work hardening characteristics of the basal slip of magnesium have been investigated by tension test at elevated temperatures, from room temperature to 300°C, using crystals of various orientations. The resolved shear stress shear strain curves obtained typically consist of two stages. The first is the well known…
Insulating films of aluminum oxide have been prepared by evaporation of aluminum in a partial pressure of 10 −3 mm Hg of oxygen. On exposure to air both dielectric constant and dissipation factor increase to values similar to those observed for anodized films on bulk aluminum. The results can be understood if the init…
E. A. C. Lucken, J. Chem. Soc., 1962, 4963 DOI: 10.1039/JR9620004963
The first page of this article is displayed as the abstract.
In attempts to postulate dehydroxylation mechanisms for the clay minerals, three assumptions have generally been made: that the elements of water are lost more or less uniformly from all over the crystal, that the tetrahedral parts of the structure are less likely to be disturbed than are the octahedral parts, and tha…
J. P. Elder and A. Hickling, Trans. Faraday Soc., 1962, 58, 1852 DOI: 10.1039/TF9625801852
This study was made to solve the following questions: (1) Which of the three crystal forms of calcium carbonate (calcite, aragonite and vaterite) is produced most predominantly from sea water by inorganic processes. (2) Which of the chemical constituents of sea water has the greatest influence on the polymorphic forma…
Neutron-diffraction patterns of CaH/sub 2/ and CaD/sub 2/ were measured to obtain more information on the positions of the hydrogen atoms. The results are in disagreement with those of Zintl and Harder, and calculations on the basis og a CaH/sub 2/ model were found to agree with the experimental data while those of Zi…
Pressure‐temperature‐composition studies of the yttrium‐hydrogen system were made in the temperature range 900°–1350°C and the pressure range 1–760 mm Hg. The existence of a yttrium‐solid‐solution phase and a yttrium‐hydride phase, which approaches in composition, was established. These phases occur over a range of co…
Departure from linearity in the stress-strain relationships and plastic deformation are observed in reactor grade graphite at very small stresses. A model is put forward which describes the mechanical behaviour of such a material and a simple mathematical theory is derived which is shown to give an adequate descriptio…
Certain minerals in soil clays may be directly estimated from diffraction line intensity and the mass absorption coefficient of the sample to the radiation used. The main advantages of the method described are that no internal standards or calibration charts are required, and any dif-fraction line of the component to…
The suboxide of boron, B 6 O , has been prepared as a pure crystalline powder and in dense solid masses. The existence of B 6 O was substantiated from crystallographic, chemical, and density data. Information on x‐ray diffraction, chemical formation, oxidation resistance, and stability is also described. B 6 O was fou…
The list of known finite simple groups other than the cyclic, alternating, and Mathieu groups consists of the classical groups which are (projective) unimodular, orthogonal, symplectic, and unitary groups, the exceptional groups which are the direct analogues of the exceptional Lie groups, and certain twisted types wh…
Abstract not Available.
Pyrolized graphite samples are produced by pyroly tic deposition on substrates at temperatures of 1700 to 2500 deg C. A review is presented of the basal plane and c-direcion conductivities, electrical anisotropy, Hall coefficient, and magnetoresistance of these samples, as functions of the deposition temperature and t…
W. P. Griffith, Q. Rev. Chem. Soc., 1962, 16, 188 DOI: 10.1039/QR9621600188