Materials Literature
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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…
In the preceding paper [J. Appl. Phys. 57, 2110 (1985)], it was shown that the behavior of eddy current losses in ferromagnetic materials can be fully characterized, in general, in terms of two parameters, the effective number ñ0 of active magnetic objects present at low magnetizing frequency fm, and the field V0, de…
Rietveld analyses of neutron powder diffraction data on Pr2Fe14B and Dy2Fe14B are reported. Both phases form the Nd2Fe14B tetragonal crystal structure (P42/mnm). At 77 and 293 K our analyses indicate that all magnetic moments in each compound are collinear with the c axis. The rare-earth moments in Pr2Fe14B are parall…
Protonic diffusion in hydrogen-bonded networks, ionic conduction in polymeric solid electrolytes, and other processes in which the carrier transport mechanism involves motion of the host medium on a time scale comparable to that of the carrier motion itself require generalization of the usual models based on carrier h…
Multilayer structures of molybdenum and silicon have been synthesized by sputter deposition onto flat silicon single-crystal silicon substrates and spherically ground (0.5- and 22.0-m radii) fused silica substrates and the reflectivities for 170.4-Å (72.8-eV), 160.1-Å (77.4-eV), and 228-Å (54.4-eV) light measured at n…
The basic physical mechanism responsible for the general behavior of eddy current losses versus magnetizing frequency fm is recognized in the competition between the external field and local internal fields, due to magnetostatic, coercive, and eddy current effects. The concept of magnetic object, corresponding to a gr…
Amorphous Si and Ge layers, produced by noble gas (Ar or Xe) implantation of single crystal substrates, have been crystallized in a differential scanning calorimeter (DSC). The MeV implantation energies resulted in amorphous layers of micron thickness whose areal densities were determined using the Rutherford backscat…