Negative Poisson's Ratio Materials
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The phase diagram of ammonium iodide (NH4I) under pressure, and a comparison with NH4Cl and NH4Br
During recent measurements of thermal conductivity using the transient hot-wire method, data were obtained for pressure-temperature coordinates corresponding to transitions amongst phases I, II, III and IV and NH 4 I which extended reliable knowledge of the phase diagram to pressures of 2 GPa. Comparison of the phase…
Calculation of surface phonons and resonances: the matching procedure revisited: I
A detailed account is given of the matching procedure devised to calculate surface phonon and resonance dispersion curves. Each kind of phonon symmetry is studied separately. A secular equation is first derived which is shown to contain in particular all the information on the dispersion curves and density of states o…
Temporal coherence in the sliding charge-density-wave condensate
The narrow-band noise (NBN) in the charge-density-wave conductor ${\mathrm{NbSe}}_{3}$ is found to fluctuate dynamically in frequency, amplitude, and harmonic content. The NBN width is dominated by slow frequency fluctuations rather than a spatial velocity distribution. Mode locking quenches these fluctuations yieldin…
Optical Properties of β-Bi2O3 Thin Films
Optical properties of β-Bi2O3 films prepared by activated reactive evaporation are studied from 0.5 to 3.5 eV. It is shown that β-Bi2O3 is an indirect band gap semiconductor with a band gap of (1.74 ± 0.5) eV and the optical transition leading to this is an allowed one. The direct gap of β-Bi2O3 is 2.6 eV.
New Opportunities in Synchrotron X-ray Crystallography
Several high-intensity synchrotron x-ray sources have been constructed over the past few years in the United States, West Germany, Great Britain, Japan, France, Italy, and the Soviet Union. Crystallographers have begun to use these facilities for experiments that take advantage of the characteristics of synchrotron ra…
A Mössbauer Investigation of Equiatomic FeCo with Vanadium and Niobium Additions
The structure and magnetic properties of equiatomic FeCo alloys with ternary additions of up to 1.92 at% Nb and 6 at% V are studied by means of Mössbauer spectroscopy, complemented with light and electron microscopy and the determination of magnetisation curves, as function of heat treatment. The main features of the…
Germanates with NdAlGe2O7-Type Structure. Synthesis, Crystal Structure, Absorption-Luminescence Properties, and Stimulated Emission of Their Activator, Nd3 Ions
New germanates with the NdAlGe2O7-type structure are synthesized. The Czochralski method is used to grow LaGaGe2O7: Nd3+ single crystals and the full concentration series of Gd1−xNdxGaGe2O7 crystals. The GdGaGe2O7 crystal structure is refined. The absorption–luminescence properties of the grown crystals have been stud…
Semiconducting and Photoelectrochemical Properties of n- and p-Type β-CuCNS
β-CuCNS, a three-dimensional polymeric solid with interbonded layers is found to have unusual photoelectrochemical and solid state properties. The material becomes p- or n-type depending on whether CNS or Cu in stoichiometric excess. The n-type is found to be sensitive to the visible spectrum. The methods of preparati…
Structure of a second polymorph of calcium acetate monohydrate
Ca(CH 3 COO) 2 •H 2 O cristallise dans le systeme triclinique avec le groupe d'espace P1. Affinement de la structure jusqu'a 0,029
Critical plasmons of a Fibonacci semiconductor superlattice: Spectrum and optical properties
We study the collective excitations of an array of two-dimensional electron-gas layers arranged in a Fibonacci sequence. The plasmon spectrum is calculated using a transfer-matrix method. It is demonstrated that the spectrum is critical. Global scaling properties of the spectrum are discussed. The infrared resonant ab…
XPS and UPS investigation of PF6 doped and undoped poly 3-methyl thiophene
XPS and UPS techniques have been used to characterize electrochemically grown conductive films using two different solvent systems of poly (3-methyl thiophene) in the PF6 doped and undoped states. Core-level and valence-level spectra have yielded information on the nature of the polymeric cation and its associated PF6…
Surface plasmons in two-sided corrugated thin films
Coupled surface plasmons in a thin free-standing metal film with both the interfaces periodically corrugated are studied. Infinite Rayleigh expansions in terms of the spatial harmonics with proper boundary conditions are used to obtain the infinite hierarchy of coupled amplitude equations. The truncated system of equa…
Ferroelectriclike dielectric behavior in the piezoelectric amorphous copolymer of vinylidenecyanide and vinyl acetate
The alternating copolymer of vinylidenecyanide and vinyl acetate is the first amorphous polymer to show a combination of excellent properties among the several known piezoelectric polymers, e.g., high piezoelectric activity (d31=7 pC/N), high electromechanical constant (kt=0.38), and high thermal stability (glass tran…
Angle-resolved inverse photoelectron spectroscopy studies of CdTe(110), CdS(112¯0), and CdSe(112¯0)
The conduction-band structures of CdTe(110), CdS(112\ifmmode\bar\else\textasciimacron\fi{}0), and CdSe(112\ifmmode\bar\else\textasciimacron\fi{}0) have been studied using angle-resolved inverse photoelectron spectroscopy. With normally incident electrons substantial parts of the conduction bands have been observed and…
Crystallization and glass formation processes in liquid sodium: A molecular dynamics study
Crystallization and glass formation processes are studied for the sodium system with 108 atoms by means of molecular dynamics simulation with constant volume. The equilibrium liquids, with four different initial conditions, are cooled with four different rates. The processes are analyzed by means of Voronoi polyhedra,…
On Ambient-Pressure Superconductivity in Organic Conductors: Electrical Properties of (DMET)2I3, (DMET)2I2Br and (DMET)2IBr2
We discovered superconductivity at ambient pressure in (DMET) 2 I 3 at 0.47 K and in (DMET) 2 IBr 2 at 0.59 K (midpoints), where DMET is (dimethyl(ethylenedithio)diselenadithiafulvalene), while in (DMET) 2 I 2 Br, superconductivity was not observed down to 0.5 K. In the DMET salts, those with smaller molar volume exhi…
Elastic state and thermodynamical properties of inhomogeneous epitaxial layers: Application to immiscible III-V alloys
The elastic strain and stress fields and the elastic energy of the system composed of a crystalline epitaxial layer of finite thickness coherently grown on a bulk substrate are calculated, when the intrinsic stress-free lattice parameter of the layer is modulated along directions parallel to the substrate surface. Whe…
Electron Density Distribution in AgBr
The electron density distribution in AgBr was investigated on the basis of X-ray intensity data collected by single crystal diffractometry. It was verified from difference Fourier map that the charge tends to accumulate in the intermediate region between the neighbouring unlike atoms. The origin of the extra charge on…