Materials Literature
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This work reviews and discusses the data on the various thermodynamic properties of iron and silicon available through March 1984. These include heat capacity, enthalpy, enthalpies of transition and melting, vapor pressure, and enthalpy of vaporization. The recommended values for heat capacity, enthalpy, entropy, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition and melting behavior of poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) (PEEK)Stephen Z. D. Cheng, M. Y. Cao, and Bernhard WunderlichCite this: Macromolecules 1986, 19, 7, 1868–1876Publication Date (Print):July 1, 1986Publication History Publi…
The gene (fdhF) coding for the selenopolypeptide of the benzylviologen-linked formate dehydrogenase of Escherichia coli was cloned and its nucleotide sequence was determined. The fdhF gene contains, within an open reading frame coding for a protein of 715 amino acids (calculated molecular weight, 79,087), an opal (UGA…
The uniaxial tensile deformation behavior of 3 molpercent Y/sub 2/O/sub 3/-tetragonal ZrO/sub 2/ polycrystals was studied at temperatures up to 1500 C in ambient atmosphere. The tensile specimens which were elongated at constant displacement rates from 0.00011/s to 0.00055/s at 1450 C exhibited unusually large deforma…
The radial dynamics of a spherical bubble in a compressible liquid is studied by means of a simplified singular-perturbation method to first order in the bubble-wall Mach number. It is shown that, at this order, a one-parameter family of approximate equations for the bubble radius exists, which includes those previous…
An investigation is made into the dynamics involved in the movement of the contact line when one liquid displaces an immiscible second liquid where both are in contact with a smooth solid surface. In order to remove the stress singularity at the contact line, it has been postulated that slip between the liquid and the…
L. Hoffmann, Cyanophycées aériennes et subaériennes du Grand-Duché de Luxembourg, Bulletin du Jardin botanique National de Belgique / Bulletin van de Nationale Plantentuin van België, Vol. 56, No. 1/2 (Jun. 30, 1986), pp. 77-127
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.