Materials Literature
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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…
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…
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…
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
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 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…
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…
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…
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 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,…
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…
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…
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…
The crystal structure of [N (CH 3 ) 4 ] 2 ZnCl 4 was studied at three temperatures, 30, 60and 90°C, in the paraelectric phase and at 5.5°C in the ferroelectric phase by using theX-ray reflection data collected by an automatic four-circle diffractometer. The split-atom method and the significance test showed that the c…
Two phenomena are pointed out which, if observed, would testify that the superconductivity in the Bechgaard salts belongs to the triplet pairing: excitation of the spin waves in the radio-frequency fields and the superconductivity restoration in high enough magnetic fields H || b *.
Interpretations for the energies corresponding to the peaks in the reflectivity and the imaginary part (${\ensuremath{\epsilon}}_{2}$) of the complex dielectric constant (\ensuremath{\epsilon}=${\ensuremath{\epsilon}}_{1}$+i${\ensuremath{\epsilon}}_{2}$) have been sought successfully using Penn-like model calculations…
The electronic structure of ${\mathrm{Fe}}_{\mathrm{x}}$O (x\ensuremath{\simeq}0.95) has been studied by photoemission spectroscopy using synchrotron radiation. Fe 3d character in the valence band is found to extend over a wide energy range from the top of the valence band to the satellite region, \ensuremath{\sim}15…
Properties of the electrical resistance of a one-dimensional quasicrystal, whose structure is governed by the Fibonacci rule, are studied by means of the Landauer formula. In particular, it is shown that the growth of the resistance with sample length is bounded by a power law for certain energies. More specifically,…
The reconstructions observed on the annealed (111) surfaces of Si and Ge can be explained on the basis of a simple model of the surface energetics. The driving force for the Si 7\ifmmode\times\else\texttimes\fi{}7 reconstruction is the formation of dimer-row domain walls, which order in a triangular pattern for topolo…
The dynamical structure factor S(Q,\ensuremath{\omega}) and the vibrational density of states g(\ensuremath{\omega}) for amorphous silicon have been measured by neutron scattering methods. Computer simulations of S(Q,\ensuremath{\omega}), based on a 216-atom structural model, are in substantial agreement with experime…