Materials Literature
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Two general explanations for the Meyer-Neldel rule are described. The required correlation between the activation energy and pre-exponential factor for conductivity is shown to result by considering (i) a rectifying layer at the electrode-solid interface which produces a field dependent potential barrier through which…
Thermoluminescence (TL) and optical absorption measurements on LiF(TLD-100) show that the radiation- induced increase of TL sensitivity of this phosphor occurs in the luminescence process. New data are presented on thermally stimulated exoelectron emission (TSEE), photoluminescence (PL) and radioluminescence (RL). The…
The 100 degrees C thermoluminescence (TL) sensitivity of fired quartz is increased greatly by beta irradiation and subsequent heating (eg by an order of magnitude following a 1 krad dose and heating to 500 degrees C). Its radioluminescence response increases similarly, implying that the increase of TL sensitivity aris…
Abstract The five magnetostriction constants h1 to h5 have been determined for nickel at 4.2, 77 and 300 K from independent measurements on two crystals. At 4.2 K, h3, h4 and h5 are all small compared with h1 and h2 and there is nothing to suggest that a five-constant equation inadequately represents the magnetostrict…
The electrodynamic phenomenon of void resonance is used to interpret anomalous structure reported by Donovan and co-workers in the uv dielectric constants of evaporated amorphous germanium. The resulting void parameters are consistent with the existence of a connected network of microcracks perhaps 6 \AA{} in width, s…
Electrical conduction in resistor networks with all but a fraction $p$ of the resistors removed is studied as a paradigm of classical transport in disordered materials. A self-consistent effective-medium theory provides a quantitative description of the model, except in a small critical region, where the scaling law $…
The shape memory effect is investigated on many kinds of materials undergoing the martensite transformation. The present experiment proves that such metals and alloys as Co, Ti, Zr, CoNi, CuAl, FeNi and InTl exhibit the shape memory effect. From these results and considerations on the plastic deformation of materi…
Self diffusion of Cr51 in pure chromium, Cr + 20 wt% Ni, Cr + 44 wt% Ni, and Cr + + 65 wt% Ni has been measured over the temperature ranges of 1000 to 1900, 1000 to 1525, and 900 to 1350 °C, respectively. Over the temperature range of 1000 to 1750 °C the Arrhenius plot for the self diffusion of Cr51 in pure Cr is line…
The thermal conductivity of lightly Sb-, P-, and As-doped germanium was measured between 0.3 and 4.2 K. The strong scattering of phonons by neutral donors observed earlier above 1 K diminishes below 1 K, as predicted by the theories of Keyes and of Griffin and Carruthers. Inclusion of resonance fluorescence of phonons…
The three independent adiabatic elastic constants and their temperature derivatives have been measured near room temperature for single-crystal $\ensuremath{\alpha}$-phase Cu-Al alloys for compositions to 13 at.% Al using an ultrasonic pulse-superposition technique. The elastic shear constant ${C}_{44}$ increases line…
A detailed Raman-scattering investigation of LiI${\mathrm{O}}_{3}$, combined with the polarized infrared-reflectivity measurements, is reported. The dielectric constants determined by the Lyddane-Sachs-Teller (LST) relation (${\ensuremath{\epsilon}}_{\mathrm{xx}}=6.7,{\ensuremath{\epsilon}}_{\mathrm{zz}}=6.1$) do not…
The dc conductivity and ac dielectric susceptibility of normal and deuterated lithium hydrazinium sulfate have been measured over a wide temperature range at frequencies up to 9.33 GHz. Over a very large temperature and frequency range the real and imaginary parts of the susceptibility are very large (up to ${\ensurem…
The complete set of ten third-order elastic constants of magnesium has been determined from measurements of the hydrostatic-pressure and uniaxial-compression derivatives of natural sound velocities using an ultrasonic pulse-superposition technique. The specimen was neutron irradiated with an integrated exposure of 2 \…
Calculations of the core contributions to the Compton profiles for lithium ($1{s}^{2}$), carbon ($1{s}^{2}$), and aluminum ($2{s}^{2}2{p}^{6}$) were made employing excited-state one-electron continuum wave functions evaluated in the ground-state Hartree-Fock-Slater potential of the nucleus and remaining electrons. Goo…
Abstract : The theory of dislocations in a continuum is developed. Methods are presented for solving boundary value problems for stresses and displacements due to distributions of dislocations. Examples are presented of the application of the theory to crystalline materials.
Measurements were made by x-ray photoelectron spectroscopy of the $4f$ level energies in Au and the $3d$ level energies in Ag with these elements in several forms: pure metals, Au-Ag alloys, Au${\mathrm{Al}}_{2}$, and Au${\mathrm{Ga}}_{2}$. Only very small core-level energy shifts are seen, even though existing M\"oss…
Ultrasonic absorption measurements made in the nematic liquid crystals $p$-azoxyanisole and $p$-azoxyphenetole, which were oriented by an external magnetic field, are used to calculate anisotropic viscosity coefficients. Values of $\frac{\ensuremath{\alpha}}{{f}^{2}}$ and the anisotropy of $\frac{\ensuremath{\alpha}}{…
A method is presented for calculating the temperature increase that results from heat generation by radioactive wastes placed in a subsurface cavity. Cavities of spherical, cylindrical, and other shapes are considered. The method takes into account the disintegration energy released by the various isotopes present in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeriodate oxidations of enamines. I. Oxidation of adenosine 5'-monophosphate in the presence of methylamineD. H. RammlerCite this: Biochemistry 1971, 10, 25, 4699–4705Publication Date (Print):December 7, 1971Publication History Published online1 May 2002Published inissue 7 D…
The density of states of the valence and conduction bands of Si and Ge are discussed using a simple tight-binding Hamiltonian. It is shown that certain features of the density of states for the case of the diamond structure are related to the short-range order and hence should be retained in the amorphous state while…