Materials Literature
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The torsional creep and creep recovery behavior of amorphous 1,3,5-tri-α-naphthyl benzene was studied, while at metastable equilibrium density, along a specified glassy volume—temperature line, and during isothermal volume contraction below the conventional glass transition temperature Tg. Dilatometric measurements co…
Below the Verwey transition the ${\mathrm{Fe}}^{2+}$ and ${\mathrm{Fe}}^{3+}$ ions on B sites in magnetite are magnetically coupled to $A$-site ions by different exchange constants. We calculate the six-sublattice spin-wave spectrum of this ordered orthorhombic structure, for arbitrary spin quantum numbers and for arb…
The optical constants for electropolished intrinsic germanium have been determined for the spectral region between 0.5 and 3.0 eV at 300 and 120\ifmmode^\circ\else\textdegree\fi{}K. The technique is based on the determination of the ratio ${\mathcal{R}}_{n}=\frac{{R}_{\mathrm{II}}}{{R}_{\ensuremath{\perp}}}$ at its mi…
Optical absorption in CdTe single crystals is reported for photon energies just below the transmission limit at about 1.5 eV at several temperatures between 2 and 300\ifmmode^\circ\else\textdegree\fi{}K. Chemical removal of damaged surface layers was required to obtain concordant results from mechanically polished sam…
The production of an isolated displacement spike by a collision cascade in $\ensuremath{\alpha}$-iron, tungsten, and copper at 0\ifmmode^\circ\else\textdegree\fi{}K and the annealing of displacement spikes in $\ensuremath{\alpha}$-iron at temperatures up to 250\ifmmode^\circ\else\textdegree\fi{}C were studied using th…
A new method of spectroscopy of solids is presented. By means of it, information concerning the state densities in solids is extracted from measured kinetic-energy distributions of electrons ejected from the solid by slow noble-gas ions. The basic electronic process involved is the radiationless, two-electron, Augerty…
Abstract A theoretical model of the energy changes accompanying grain boundary movement has been developed. It has been shown that small boundary movements will reduce the energy of a polycrystalline metal only when there is a heterogeneous grain size. The pinning force exerted by precipitate particles of a second pha…
Experimental measurements of the phonon dispersion relation for SnTe suggest that the phase transition of GeTe and SnTe/GeTe alloys is of a displacive character, similar to that of the perovskite ferroelectrics. They therefore provide the first examples both of diatomic ferroelectrics and of "ferroelectric semiconduct…
Article Einfluß der Adsorption von Sauerstoff und Wasserdampf auf die elektrische Leitfähigkeit dünner Eisenschichten was published on October 1, 1966 in the journal Zeitschrift für Physikalische Chemie (volume 233O, issue 1).
Chemical, physical, and mineralogical studies have been made on Gray Wooded and Solonetzic soils developed on varved clays in four glacial lacustrine basins in north central British Columbia.The soils have a high content of exchangeable cations. Calcium and magnesium are the dominant cations in all soils but sodium is…
Observations were made on deformation twins in single crystals of a 3% vanadium-iron alloy which were deformed in compression along the [1̄10] direction at -195°C. In most twin bands, a narrow but straight line (`midrib') is seen to run along the longitudinal direction. Electron microscope observations show that the t…
The method for calculating the generalized first-flight collision probability in a lattice system with a certain total cross section by the exact generalized first-flight collision probability in a system of the same geometry, having a different standard total cross section, is presented. The time required to calculat…
Abstract For a system of equivalent bonds undergoing random bond scission it is reasonable to assume that the rate of bond breaking (hence the rate of creation of new molecules) reported in the literature and data presented here demonstrate that the number of molecules created is not proportional to the time of therma…
The presence of bands in the lower sola has presented difficulties in the classification of soils developed from pitted deltaic sandy parent materials west of Edmonton, Alberta. The bands were shown to contain more organic matter, free iron, and clay than the interbands, which resulted in a darker, redder color and fi…
Measurements are reported of the electrical resistivity of nickel ferrites having cobalt substitutions of up to 5%. For certain compositions large resistivities are found due to the buffering action of the cobalt ions, which behave in this respect similarly to managanese ions in nickel ferrite. Some differences are ob…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation L. B. Harris, G. J. Vella; Conductivity of Single Crystals of Potassium Dihydrogen Phosphate. J.…
The theories of Carruthers and Klemens of the scattering of phonons by dislocations are compared, and it is shown that Carruthers' approach yields larger cross sections in several ionic crystals: LiF, NaF, NaCl, KCl, KBr, KI, NaI, and MgO. Klemens employs a Grüneisen model for anharmonic coupling, while Carruthers dea…
The effect of substitutional and interstitial atoms on the absorption of high energy electrons is considered. Two mechanisms of absorption are discussed; viz. the contributions due to scattering by the additional scattering centres and due to displacements of the atoms surrounding the point defects. The absorption est…
Thermal expansion, temperature change of electrical resistance and its change due to hydrostatic pressure, and magnetic susceptibility were measured with some antiferromagnetic Fe-Mn alloys containing 30 to 40 at% Mn. It was found that an additional magnetic volume expansivity, δ V / V , due to an antiferromagnetic sp…
1. The rubber particles in Hevea brasiliensis latex have been partially purified by ;washing' with buffer solution, and separated into active fractions of different particle size. 2. The enzyme responsible for incorporating isopentenyl pyrophosphate into rubber is distributed between the surface of the rubber particle…