Materials Literature
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We have studied the crystallization of Bacillus ste- arothermophilus tryptophan tRNA synthetase. Exper- imental conditions used in 35 different crystallization trials were chosen by systematic assignment of varia- bles in accordance with the two principles of randomi- zation and balance, which are characteristic of in…
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An analysis of the Rietveld profile refinement method used in the interpretation of neutron or X-ray powder diffraction patterns has been carried out. It is shown that the values obtained for the structural parameters are not exactly the same as those obtained from an integrated intensity refinement of the same data a…
Article Effective coordination numbers (ECoN) and mean fictive ionic radii (MEFIR) was published on December 1, 1979 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 150, issue 1-4).
It is proposed that, during dislocation glide at low temperatures, both screw and non-screw dislocations annihilate mutually with dislocations of opposite sign approaching on closely neighbouring glide planes. The experimental evidence is summarized and possible mechanisms are discussed. Phenomenological models of dis…
Two-dimensional and three-dimensional band structures of the GaSe family of crystals have been calculated by the tight-binding method. The author's calculations fit the photoemission bandwidths well, particularly for the anion p x,y bands and, for GaSe, find similar band orderings and dispersions to those of M Schlute…
The precipitation of oxygen in bulk dislocation-free Czochralski silicon subjected to isothermal annealing at temperatures between 400 and 1100 °C is studied by means of infrared spectroscopy and transmission electron microscopy. From the changes in the infrared spectra observed after heat treatment it is concluded th…
Self-diffusion in cobalt is investigated from 896 to 1745 K by means of the standard radio-tracer method using lathe sectioning in the paramagnetic and sputter sectioning in the ferromagnetic region. The diffusion coefficients vary between about 10−17 cm2 s−1 and 10−9 cm2 s−1; their temperature dependence can be descr…
The results of experiments carried out in the HVEM may be influenced by radiation effects which occur during observation. The appropriate processes are reviewed. Atom displacement threshold energy data are compiled and the consequences for the applicable specimen thickness discussed for the case that experiments are p…
Molybdenum trioxide (MoO3) has been deposited onto single-crystal p-type silicon by neutralized ion-beam sputter techniques. The results indicate that the diode behavior is a function of oxygen partial pressure during the reactive sputtering. Film thickness, deposition rate, index of refraction, resistivity, and integ…
A simple null lens is described that is moved back and forth relative to a point source to provide large amounts of variable wave front aberration. This device can be used to test a wide variety of optical components and systems.
An analysis, in terms of Newman’s superposition model, of the cubic spin–Hamiltonian parameters for divalent manganese and trivalent iron in fluoroperovskite and II–VI compounds is presented. Values for the intrinsic parameter ?4 and for the power-law exponent t4 of Mn2+ with F−, S2−, Se2−, and Te2− ligands are report…
We report the preparation and electrochromic properties of iridium oxide films deposited by reactively sputtering iridium in a humidified oxygen discharge. These sputtered iridium oxide films (SIROFs) have the fast coloring and bleaching kinetics and excellent stability previously observed for anodically grown iridium…
A detailed account of a measurement of order parameter of a liquid crystal at the boundary by means of the wall-induced pretransitional birefringence is given. Several surface treatments were studied including surfactants and evaporated films. Although all treatments produced good alignment in the nematic phase, the b…
We present the results of an experimental and theoretical study of the thermal and thermoelectric properties of pure potassium for zero magnetic field and for fields up to 4.5 T, at temperatures of 1.5-4.2 K. The approximate quadratic dependence on field of the transverse thermal magnetoresistivity is found to be the…