Materials Literature
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Previously collected high-resolution neutron-diffraction data from KH 2 PO 4 (KDP) at room temperature have been re-analysed, including careful correction for thermal diffuse scattering, absorption and extinction and similar, new data have been obtained from 95%-deuterated KH 2 PO 4 (DKDP). This has made possible, for…
Received 16 November 1987DOI:https://doi.org/10.1103/PhysRevLett.60.238©1988 American Physical Society
In situ Fourier-transform infrared spectra of polyaniline give clear evidence for an insulator-to-metal transition in the first oxidation step and a metal-to-insulator transition in the second oxidation step. The former originates from a pure protonic mechanism without intercalation of counter ions whereas in the latt…
An amorphous silicon structure is obtained with a computer simulation based on a new moleculardynamics technique in which the interatomic potential is derived from a parameter-free quantum-mechanical method. Our results for the atomic structure, the phonon spectrum, and the electronic properties are in excellent agree…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Brian L. McIntyre and Christopher L. Dennis, "Low-cost electron-beam lithography package for the scanning electron microscope," Appl. Opt. 27, 196-196…
The magnetic susceptibilities χ( Q ) are calculated numerically for some tight binding band structures with semiconducting property by means of Rath-Freeman method, in which the band structures are fitted to those obtained by APW method for LaN, LaP and GdN. From these calculations, the followings are found. (i) The b…
Most quasicrystals are found in alloys which have Frank-Kasper phases. These Frank-Kasper phases are characterized by a network of interpenetrating polyhedra, with coordination numbers (CN) 12, 14, 15, and 16. While the CN-12 (icosahedral) polyhedra cause icosahedral and decagonal quasicrystalline order, the CN-14 pol…
Thin films of ${\mathrm{Se}}_{80}$${\mathrm{Te}}_{20}$ were prepared by vacuum evaporation of the polycrystalline bulk alloy at a fast rate onto replicating tape pieces held at room temperature in a vacuum of 5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}5}$ Torr. The alloy films were separated from…
We calculate the electronic resistance of a finite one-dimensional Fibonacci-sequence quasicrystal. We find that as a function of the electron energy (or, equivalently, the applied voltage) the electrical resistance of such quasicrystals shows strong fluctuations as resonant tunneling occurs through allowed energy sta…
Preparation and properties of the dc reactively sputtered tungsten oxide films have been investigated in relation to the oxygen concentration in sputtering atmosphere. The films with 1500–20 700 Å thickness were deposited on the glass substrates maintained at 200 °C by dc reactive sputtering from a metallic tungsten t…
The critical properties of the Ising model on the Penrose lattice of a size up to 439,204 sites are studied by means of the Monte Carlo simulation. We make an analysis of a phenomenological Monte Carlo renormalization group based on finite-size scaling. The critical temperature T c and the magnetic critical exponent y…
Data on the internal pressure of hard-sphere and hard-disk fluids have been available for some time from computer simulations, even at densities above the freezing density. These results for the metastable fluids suggest that the pressure diverges at the density of random closest packing. However, our examinations of…
Electromagnetic waves can discriminate between objects of different handedness due to their transverse nature, which implies that the origin of chirality necessarily need not be molecular as in the case of optically active media. By embedding chiral microstructures in a host medium, effectively chiral composites can b…
We have investigated nonlinear characteristics of high-quality ${\mathrm{K}}_{0.3}$Mo${\mathrm{O}}_{3}$ single crystals in the temperature range of 30-100 K covering eight orders of magnitude in current and more than three decades in voltage. At some temperatures, high-field measurements were extended up to 1000 times…
Dynamics of an electron in quasiperiodic systems is studied numerically. Calculations are carried out for the one-dimensional tight-binding model with diagonal or off-diagonal modulation obeying the Fibonacci sequence. The width of the wavepacket of an electron put on a single site at time t =0 exhibits such an overal…
Modern density functional theory is used to study the freezing of a polydisperse liquid of hard spheres into both face centered cubic (fcc) and hexagonally close packed (hcp) crystals. Two physically relevant, continuous distributions of particle size are studied: the gamma (or Schulz) distribution and the Gaussian di…
We describe a lattice model of a supported monolayer of flexible amphiphile molecules which treats their full three-dimensional structure and includes nearest neighbor interactions between segments of the amphiphile chains, an attraction between the chain segments and the underlying substrate, and the inter- and intra…
A stochastic model is presented to predict the molecular weight dependence of the polymer fracture energy and strength for polymers with molecular weights higher than the critical value corresponding to the onset of entanglements. A chain scission criterion is invoked for the polymer chain segments crossing the fractu…
We report on investigations of one-dimensional thermal transport in compositionally modulated metal films produced with a systematic variation in atomic lattice mismatch. In the case of Ni-Cu, Ni-Mo, Ni-Ti, and Ni-Zr, we observe the relative effects of interfacial disorder on thermal diffusion. Our observations demons…
Experimental characterization of the bulk absorption properties of sapphire, spinel, yttria, and ALON as a function of temperature is accomplished using a Bomem DA3.02 vacuum Fourier transform spectrometer and a heated cell. The measurements are performed between 2 and 20 microm from room temperatures to 775 K. Spectr…