Materials Literature
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The repulsive energy between layers of the graphite crystal has been calculated as an interaction of LCAO molecular orbitals in the layers. The van der Waals attractive term was found by setting the energy minimum to fall at 3.37A. When values of the effective nuclear charge and effective quantum number proposed by Ko…
In a paper to the Faraday Society (1946), Mering showed that the temperature to which one required to heat montmorillonite to produce irreversible collapse of the c-axis depended on the exchangeable cation. With Na-montmorillonite irreversibility began at about 550°C but with Ca-montmorillonite below 350°C During a st…
Thorium forms a tetragonal lower hydride of composition ThH{sub 2}. The hydrides ThH{sub 2}, ThD{sub 2} and ZrD{sub 2} have been studied by neutron diffraction in order that hydrogen positions could be determined. The hydrides are isomorphous, and have a deformed fluorite structure. Metal-hydrogen distances in thorium…
J. A. Elvidge and R. P. Linstead, J. Chem. Soc., 1952, 5008 DOI: 10.1039/JR9520005008
The first page of this article is displayed as the abstract.
The first page of this article is displayed as the abstract.
Abstract Studies were made of several clays of soils and other deposits to clarify the nature of weathering of layer silicates. Data obtained by X‐ray diffraction, thermal, R(OH)n sorption, and elemental analyses lead to the proposal of general occurrence of interstratified X‐amorphous zones in 2:1 layer silicates. As…
Abstract The high crystallite melting point of polyethylene terephthalate (Terylene) compared with the melting points of the aliphatic polyesters emphasizes the significance of the p ‐phenylene linkage as an important factor determining polymer properties. A consideration of other polymer structures containing the p ‐…
Après avoir rappelé l'existence et la théorie du traînage de fluctuations (ou traînage irréversible), l'auteur développe une théorie du traînage magnétique de diffusion (ou traînage réversible) selon laquelle les atomes étrangers interstitiels, qui sont à l'origine du phénomène, agiraient par couplage magnétocristalli…
F. H. Burstall and R. S. Nyholm, J. Chem. Soc., 1952, 3570 DOI: 10.1039/JR9520003570
New experiments of Molenaar and Aarts, Blewitt and others seem to confirm the view of the author, previously based only on the experiments of Gyulai and Hartly and Stepanow on sodium chloride, that vacant lattice sites, and possibly interstitial atoms, are generated during plastic flow in ductile crystals, particularl…
The discontinuous phenomena in plasticity of metals, such as the yielding, the state of ultimate strength and the brittle fracture, were regarded as a kind of Markoff process, and studied from the standpoint of nucleation theory. The fundamental features of these types of failures, namely, (1) the relation between str…
We consider a volume of material, divided into two regions 1 and 2. each of density ρ, by a moving surface S. On S a change of phase occurs, at a definite temperature (which we may take to be zero) and with absorption or liberation of a latent heat L per unit mass. If θ l , k l , K 1 are the temperature, thermal condu…
With d.c. electrical resistivities several orders of magnitude greater than those of the ferromagnetic metals, and magnetic saturation intensities in some cases less than one order of magnitude smaller, the ferrites gave promise of greater `effective permeability' and lower `eddy-current' loss in high-frequency magnet…
The specific heat and thermal expansion of high purity BaTiO 3 ceramics have been measured at temperatures from -120° to 150°C with the following results:
The phase transition and the crystal structures of cuprous iodide (CuI) have been studied by the X-ray and calorimetric measurement Two phase transitions at 369°C and 407°C were found and the corresponding energy and entropy changes were estimated from the specific heattemperature curve. The crystal lattice of γ, β an…
R. P. Linstead and M. Whalley, J. Chem. Soc., 1952, 4839 DOI: 10.1039/JR9520004839
The phase diagram of the whole range of the PbZrO 3 -PbTiO 3 system was determined by the dielectric and dilatometric measurements. According to the reason shown in part I, this phase diagram can be divided into three regiors; paraelectric, ferroelectric and antiferroelectric phases. The crystal structure of this syst…
D. H. Everett and W. I. Whitton, Trans. Faraday Soc., 1952, 48, 749 DOI: 10.1039/TF9524800749
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