Materials Literature
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Dislocation etch pit distributions and slip lines were studied on copper single crystals oriented for single glide and deformed in tension at 4·2°K. Slip lines on the cross slip plane were observed from the earliest stages of deformation and their character changed during the transition to stage II. The distribution o…
In order to determine the characteristics and controlling mechanisms of the nonbasal slip which is the secondary slip system of several hcp metals such as magnesium, tensile tests were performed on single crystals of high purity magnesium having a special orientation whose tensile axis is parallel to the (0001) basal…
Abstract The relationship between the cut growth and fatigue failure of natural rubber vulcanizates under repeated loading is examined. The cut growth behavior has been investigated using several types of test piece, and the results are shown to be consistent when interpreted in terms of the tearing energy concept dev…
M. D. Cohen, G. M. J. Schmidt and S. Flavian, J. Chem. Soc., 1964, 2041 DOI: 10.1039/JR9640002041
Some numerical solutions are presented which describe the flow in the vicinity of a collapsing spherical bubble in water. The bubble is assumed to contain a small amount of gas and the solutions are taken beyond the point where the bubble reaches its minimum radius up to the stage where a pressure wave forms which pro…
G. M. J. Schmidt, J. Chem. Soc., 1964, 2014 DOI: 10.1039/JR9640002014
The effect of roughness on the wettability of an idealized sinusoidal surface has been studied with a digital computer. The equations of Wenzel and of Cassie and Baxter are discussed in relation to the model. The heights of the energy barriers between metastable states of a drop are seen to be of utmost importance in…
Contents include: Thermogravimetry. Thermobalances. Applications of thermogravimetry. Differential thermal analysis and differential scanning calorimetry. Evolved gas detection and evolved gas analysis. Spectroscopic, photometric, and optical thermal techniques. Miscellaneous thermal analysis techniques. This revised…
It is pointed out that the absorption lines of the lanthanides that are peculiarly sensitive to changes in the ligands are consistent with the selection rules for quadrupole radiation within the 4f shell. A number of sources for this sensitivity are examined, and it is concluded that it owes its origin to the inhomoge…
Abstract The X‐ray diffraction patterns of two crystalline forms of isotactic polypropylene, the β‐ and γ‐forms distinct from the α‐form described by NATTA 1 , have been recorded. The β‐form, previously observed only as single spherulites 6 has now been obtained in a well crystalline polymer, practically free of α‐for…
Abstract A technique was devised for obtaining rate laws and kinetic parameters which describe the thermal degradation of plastics from TGA data. The method is based on the inter‐comparison of experiments which were performed at different linear rates of heating. By this method it is possible to determine the activati…
Abstract Changes in ultra-violet absorption spectra have been measured for nitrates and nitrites of the alkali metals and for ammonium, silver and thallous nitrates, in relation to thermal transformations in these solids. A gradual shift of absorption bands is found to accompany thermal expansion of all the crystals.…
Abstract Ultra-violet absorption spectra of ions in crystals are sensitive to their environment of neighbouring ions. This fact is utilized to study melting processes in nitrates and nitrites, with particular reference to changes in the average shell of nearest neighbours around any ion, on passing from crystal to mel…
We have measured with precision the temperature and pressure dependence of the Co59 nuclear resonance chemical shift (σ) in the octahedral cobalt complexes Co(NH3)63+, Co(CN)63—, and Co(NO2)63— in aqueous solution. The pressure and temperature range was 1 to 10 000 kg/cm2 and 3° to 80°C, respectively. From the pressur…
Measurements of the electronic properties of a wide variety of organic salts formed from the anionradical of tetracyanoquinodimethan (TCNQ) and various cations have been made. The results indicate that in the highest conductivity salts, which have conductivities of the order of 100 Ω—1 cm—1, the electrons are degenera…
The optical reflection spectra from 12 500 to 50 000 cm—1 were studied for a series of coprecipitated chromia—alumina samples calcined between 500° and 1400°C. The Melamed theory was employed to obtain extinction coefficients from these spectra. The Racah parameter B and the wavenumbers of the two visible transitions…
The well-known equation of Davies and Jones for the pressure dependence of the glass transition temperature, dTg/dP=Δβ/Δα=TgVΔα/ΔCp, depends on two independently testable hypotheses: that a one-parameter description of the excess thermodynamic functions is adequate, and that the glass transition occurs when some one t…
Magnetic susceptibility measurements have been carried out on a wide variety of organic salts based on the anion radical of tetracyanoquinodimethan (TCNQ). A correlation between the magnetic and electrical properties has been observed. Salts which exhibit the higher conductivities also exhibit a temperature-independen…
The dispersion relation for the normal modes of vibration propagating along the [$\ensuremath{\zeta}00$], [$\ensuremath{\zeta}\ensuremath{\zeta}\ensuremath{\zeta}$], and [$0\ensuremath{\zeta}\ensuremath{\zeta}$] directions in a single crystal of pure gallium arsenide at 296\ifmmode^\circ\else\textdegree\fi{}K has been…
The thermoelectric power ($\ensuremath{\alpha}$) of $p$-type SnTe has been measured between room temperature and 450\ifmmode^\circ\else\textdegree\fi{}C for apparent hole concentrations (${p}^{*}=\frac{1}{e{R}_{300}}$) between 1\ifmmode\times\else\texttimes\fi{}${10}^{20}$ and 1.8\ifmmode\times\else\texttimes\fi{}${10…