Materials Literature
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X-ray, calorimetric, and Raman studies show definitely that black hexagonal TlInS2-III is stable from 20 to 785 K, whereas the yellow monoclinic TlInS2-I exists as solid at temperatures from 785 K to the melting point (1050 ± 5 K). Yellow TlInS2-I can be obtained in a metastable state also at room temperature and is t…
The temperature dependence of the luminescence of natural quartz induced by X-rays between 80 and 800 K is investigated. Using afterglow investigations, the temperature dependence of the low temperature luminescence is chiefly given by an activator level lying 60 meV above the valence band and on the other hand by non…
By means of PWM-fitted screened Rutherford scattering, core ionization, and dielectric losses the scattering of electrons especially in Si-targets but also in Au, SiO2, and PMMA is investigated with regard to electron spectroscopy, electron probe microanalysis, and lithography. The behaviour of the electron backscatte…
Optical and photosensitive properties of Ag4P2O7 single crystals have been studied. The measured band gap is 3.4 eV and the transition is thought to be indirect. Ag4P2O7 single crystals show photochromism. An absorption band centered at 500 nm is induced by near-ultraviolet light irradiation, and transmission can be r…
Auger electron spectroscopy (AES) has been used to study the surface composition and electronic structure of hot-pressed samples of boron carbide. The samples had bulk compositions of ${\mathrm{B}}_{9}$C and ${\mathrm{B}}_{4}$C. After removing oxygen and excess carbon contaminants from the surfaces of the samples by n…
Thermodynamic properties of liquid Si and Ge are calculated using standard variational techniques, with the hard-sphere system as a reference system. Third-order electron-ion pseudopotential contributions are included nonvariationally and are shown to have little effect on the free energy, although a larger one on the…
The c-face optical reflectance spectra of stage-1 graphite-${\mathrm{SbCl}}_{5}$ and graphite-ICl and stage-2 graphite-${\mathrm{SbCl}}_{5}$ have been measured in the photon energy range 0.08 to 10 eV. From a Kramers-Kronig analysis of the spectra, the interband contribution to the imaginary part of the dielectric fun…
The nuclear magnetic resonance of 59 Co nuclei in magnetic domains of GdCo 5 , GdCo 5- x Ni x ( x =1, 2, 3 and 4) and Gd 1- x Y x Co 5 ( x =0.3, 0.5, 0.7 and 1.0) has been measured under external fields up to 55 kOe at 4.2 K. From the NMR study of GdCo 5 , we found that the cobalt hyperfine field at the 2c site has th…
An anisotropic softening of the acoustic mode in the ferroelastic phase transition of LaNbO 4 has been observed by the Brillouin scattering experiment. The transverse mode propagating along a direction deviated from the crystal axis by 23° in the a b -plane shows a complete softening at the transition temperature T 0…
Different target configurations have been used to directly synthesize Sm-Co based films by selectively thermalized rf sputtering onto heated substrates in an in-plane magnetic field. Samples have been sputtered so that in certain cases a systematic gradient in Sm-to-Co concentration was created along the length of the…
Conducting and transparent thin films (60 and 120 nm) of tin oxide were prepared by reactive rf planar magnetron sputtering of an undoped hot-pressed polycrystalline tin oxide target onto unheated substrates. The effects of the oxygen partial pressure on the room-temperature electrical properties of the films were stu…
The total light decay of photoluminescence in amorphous chalcogenides is described empirically by ${t}^{n\mathrm{\ensuremath{-}}1}$ exp[-(t/${\ensuremath{\tau}}_{0}$${)}^{n}$], where ${\ensuremath{\tau}}_{0}$ is the effective recombination time and 0n1. It is shown that the empirical decay function is replicated well…
The magnetic structure and magnetic phase transitions of Sc 1- x Ti x Fe 2 with x ≧0.5 were studied from measurements of Mössbauer effect and magnetization. A coexistent state of ferro- and antiferromagnetism appears at low temperatures in samples with x ≧0.7. A magnetic phase transition from the ferromagnetic to the…
The conduction mechanisms in cerium-doped yttrium aluminum garnet (Ce:YAG) have been studied as a function of temperature and PO2. ac conductivity and ionic transference measurements show that Ce:YAG is a mixed ionic-electronic conductor with an ionic conductivity characterized by an activation energy of 2.3 eV. A der…
We have measured the crystal growth rate u of B2O3-I in the amorphous phase, as it varied over five orders of magnitude with changes in temperature and pressure. We eliminated the crystal nucleation barrier by seeding the surface of boron oxide glass with crystals. u became measurable only when the pressure exceeded a…
High field magnetization of solid oxygen is measured in the pulsed field up to 500 kOe. The spin flop field H c in the antiferromagnetic α-phase is investigated in detail and exchange and anisotropy fields are evaluated. The obtained data are compared with previously determined parameters and magnetic properties of th…
We have investigated the electronic structure of oxygen vacancies on ${\mathrm{TiO}}_{2}$(110), including atomic relaxation. The study of different defect sites shows that the experimentally observed gap state at 0.7 eV below the conduction-band edge is indeed due to an oxygen vacancy. This state, however, is not due…
Electron spin resonance (ESR), electrical conductivity and thermoelectric power are studied in electrochemically prepared and doped polythiophene films. The ESR spin density increases by two orders of magnitude up to dopant concentration of ca. 3 mol%, then decreases, while the conductivity increases drastically by mo…
We present the results of calculations for the ground-state electron structure, static polarizability, and dynamic response of small metal (jellium) spheres in vacuum or embedded in a dielectric. Fully self-consistent time-dependent density-functional methods are used. In particular, the static and dynamic responses t…
We find a new ``structureless anomaly'' in several salts in the family of compounds of the form (TMTTF${)}_{2}$X (for X=${\mathrm{ReO}}_{4}$, ${\mathrm{SbF}}_{6}$, ${\mathrm{AsF}}_{6}$, and alloys of the latter anions). This anomaly is seen very clearly through thermopower studies and less clearly in conductivity data…