Materials Literature
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100-μm silicon-on-insulator structures have been achieved by first utilizing silicon molecular beam epitaxial (Si MBE) growth on porous silicon and subsequently oxidizing the porous silicon through the patterned Si MBE film windows. A Si beam method is used for the low-temperature surface cleaning of porous silicon pr…
This review deals with applications of glassy chalcogenide semiconductors in fiber and integrated optics. The physicochemical properties of chalcogenide glasses are discussed in detail. It is shown that they are promising materials for fiber-optic communication lines operating in the near infrared and particularly in…
We present a new theory of dynamic correlations for a classical one-component plasma in strong Coulomb coupling within the generalized viscoelastic formalism. The dynamic structure factor and the coefficient of shear viscosity for the one-component plasma in a metastable supercooled state are investigated and the poss…
Colloidal aggregation and other random growth processes produce structures that behave differently from ordinary bulk matter. Much of this behavior can be described in terms of the invariance of the aggregates under changes of spatial length scale: they appear to be fractals. There are two types of basic mechanisms fo…
Rectifying p-n junctions have been formed between n-type Ge20Bi11Se69 bulk glass and p-type chalcogenide films such as Ge20Se80 and As2Se3. The forward current in the power law increased with increasing bias voltage, suggesting that it was space charge limited. The spectral response of the short circuit currents showe…
The crystallinity and luminescent property were studied on evaporated CaS:Eu thin films. The orientation of the film strongly depends on substrate temperature. Distinct orientation was not observed in films deposited below 600 °C. Above 600 °C, the films tend to have a (111) orientation. The red emitting electrolumine…
We report measurements of the melting velocity of amorphous Si relative to that of (100) crystalline Si. These measurements permit the first severe experimental test of theories describing highly nonequilibrium freezing and melting. The results indicate that freezing in Si is inherently slower than melting; this asymm…
A new lattice model of polymer crystallization is described. Results of numerical solutions of rate equations for crystallization of a two-dimensional "crystal" are presented. It is shown that the crystal thickness varies inversely with supercooling and that kinetics similar to secondary nucleation occurs. This is tru…
We define a hopping Hamiltonian for independent electrons on a two-dimensional quasiperiodic Penrose lattice. This problem is then investigated numerically, up to systems of 3126 sites, and for various boundary conditions. We find the following results for the density of states: (1) There is a central peak of zero wid…
Neutron scattering experiments were carried out on the quasi-one-dimensional conductor (TaSe 4 ) 2 I. At the superlattice point (0.05, 0.05, 0.085) a soft temperature-dependent transverse acoustic (TA) mode polarised in the c plane was observed. A 'spoon-like' anomaly of the dispersion curve of the TA branch was obser…
XANES, X-ray photo-electron and optical spectra of divalent nickel in NiCr 2 O 4 and Ni 1-x Cu x Cr 2 O 4 compounds are reported. The characteristic parameters of the Ni(II) tetra -O chemical bond in spinels are not very sensitive to the Jahn-Teller effect. The tetragonal distortion c/a<1 for the Ni 1-x Cu x Cr 2 O 4…
The luminescence spectra and decay curves of Sb 3+ -doped Cs 2 NaMCl 6 (M=Sc,Y,La) are presented. In these compounds the 5s 2 ion is octahedrally surrounded by six chloride ions like the s 2 ions in alkali halides. Therefore, they can be considered as an ideal model system. It appears that the Sb 3+ luminescence in Cs…
Abstract When heated in air, minnesotaite begins to oxidise to a ferric form aI 400°C. By the onset ofdehydroxylation at 600°C, oxidation is virtually complete without significant changes in the lattice parameters.
Bend-contour pattern analysis is used to study processes occurring in initially dislocation-free selenium crystals during the formation of subgrain boundaries in the course of crystal growth. Using the data obtained on the magnitude and character of lattice disorientations in various types of emerging boundaries, a bl…
The general technology development and demonstration of a Nuclear Engine for Rocket Vehicle Application (NERVA), a joint AEC-NASA program, was undertaken successfully in the 1960's and terminated in 1971 for lack of a specific mission. Detailed flight engine specifications were defined and several candidate designs wh…
A new preparation method of Cu/Cu2O Schottky barrier solarcells is proposed and worked out. It combines resistive evaporation of a thin semitransparent copper electrode on a Cu2O substrate (step I) and exposition of the obtained junction to the H+ ion irradiation (step II). Both, dark and illuminated (AMI) current-vol…
Self-similar structures of single-crystalline domains in lipid monolayers at the air-water interface are observed after a stepwise increase of the surface pressure. It is shown that these fractal structures with Hausdorff dimensions of $d\ensuremath{\approx}1.5$ anneal because of the influence of edge tension on time…
This is the first of a series of papers in which a second-order perturbation theory is derived for the Hamiltonian of a metal hydride. The theory, which is called the fully harmonic lattice approximation, or FHLA, goes beyond the customary harmonic treatment of Horner and Wagner to include second-order terms for the h…
Nonresonant interband Faraday rotation in amorphous semiconductors, as a function of photon energy, may be described by an equation derived for direct transitions in crystalline semiconductors. In this paper it is shown how this equation may be obtained for the former case also, assuming a parabolic density of states…
Results of self-consistent first-principles calculations of the electronic band structures of the three cesium halides within the local-density functional formalism are presented. The calculations were done with the linear muffin-tin orbital (LMTO) method and relativistic effects were taken into account. The general f…