Materials Literature
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Electrochromic niobium oxide thin films were prepared by a radio-frequency magnetron sputtering method. Amorphous Nb2O5 thin films deposited at radio-frequency power 100 W showed the electrochromic behavior: Reduction and oxidation of the films in 0.1 M Na2CO3+0.1 M NaHCO3 buffer solution resulted in coloration and bl…
Experimentally observed stress-strain characteristics in yield deformation of Si, GaAs, and InP crystals are discussed in terms of the dynamic processes of dislocations on a microscopic scale. It is shown that experimental observations are satisfactorily reproduced by calculation on a theoretical model using empirical…
Depolarized hyper Rayleigh scattering of para-nitroaniline (${\mathit{C}}_{2\mathit{v}}$ symmetry) and nitrocalix[4]arene (${\mathit{C}}_{4\mathit{v}}$ symmetry) in solution has been measured. Using linearly and circularly polarized fundamental radiation information about the ratios between the several hyperpolarizabi…
We propose, and verify in the case of a Ge-doped-silica-core optical fiber, a general explanation for the power-law dependencies on dose frequently observed for the concentrations of radiation-induced defect centers in insulating glasses. This insight permits detailed prediction of the postirradiation recovery curves…
The losses associated with the high-field tail region of the ferromagnetic resonance (FMR) absorption curve were investigated at 10, 19, 35, and 60 GHz for 0.10–1.75-mm-thick c-plane circular disks of flux-grown single-crystal M-type barium ferrite materials. A conventional high-field effective linewidth analysis of t…
The surface core-level shift of the Mo(110) surface is determined from high-resolution photoemission measurements of the Mo 3d level. The 3d core-level binding energy of the surface atoms is found to be lowered by 333\ifmmode\pm\else\textpm\fi{}10 meV relative to that of the bulk atoms. This result agrees well with se…
The linear response theory is applied to the interaction site model for the evaluation of static dielectric properties of a flexible water model. The atom–atom radial distribution functions derived from hybridization of the computer simulations and optimized cluster theory [A. D. Trokhymchuk, M. F. Holovko, E. Spohr,…
The Nd-Fe-B and Nd-Fe-Co-B magnet powders with the high coercivity (≥10 kOe) were obtained by the hydrogenation-decomposition-desorption-recombination (HDDR) process at temperatures between 800 °C and 900 °C. We studied magnetic properties and microstructures of the Nd-Fe-B systems during the HDDR process. The NdH2 ph…
We study the dynamic process of homogeneous quantum phase slippage in bulk charge-density-wave systems. A topological singularity, namely, a ``vortex shell'' in 3+1 dimensions is proposed as a trial wave function of the saddle-point field. The quantum tunneling rate is roughly \ensuremath{\Gamma}\ensuremath{\sim}exp(-…
The quasi-one-dimensional (1D) magnetoplasmons of a graphene tubule threaded by a magnetic field (B) have been evaluated exactly within the random-phase approximation. The plasmon frequency ${\mathit{w}}_{\mathit{p}}$ exhibits a very rich structure as a function of the magnetic flux through the tubule (\ensuremath{\va…
Hydrogen containing carbon (C:H) films have been prepared by ion beam deposition of 160 eV ethane ions on a carrier consisting of a Pt(111) single crystal surface covered with a monolayer of graphite. Several monolayers thick films deposited at 350 K contain hydrogen bound to sp, sp2, and sp3 hybridized carbon. Vibrat…
We have calculated the valence photoemission and bremsstrahlung isochromat spectra for TiO 2 , Ti 2 O 3 and VO 2 by means of an MO 6 cluster model (M=Ti, V). The result shows that the first ionization state and the lowest affinity state have considerable O 2 p character because of the large hopping matrix element betw…
The atomic structure of small-cross-section (\ensuremath{\approxeq}10 A\r{}), hydrogen-terminated silicon quantum wires is fully relaxed within the local-density approach showing bulklike coordination of the Si atoms. The electronic states near the fundamental gap (substantially blueshifted from that of bulk Si) show…
We use ab initio local-density-approximation methods to study the electronic and geometrical structure of the various C(100) surfaces. The calculated densities of states suggest that the surface states observed for the (2\ifmmode\times\else\texttimes\fi{}1) surface are attributable only to the clean C(100)(2\ifmmode\t…
Abstract Aggregates that may exist in poly(vinyl chloride) (PVC) solutions at ambient temperatures compromise the accuracy of SEC measurements of molecular weight distributions. Aggregate‐free solutions can be produced in 1,2,4‐trichlorobenzene (TCB) by controlling the dissolution time and temperature. SEC measurement…
Abstract The morphology of a number of polyamides (PA)—namely, PA‐66, PA‐6/PA‐66 blends, and PA‐6/PA‐66 copolymers—prepared from HCOOH solution and from the melt has been examined as well as the effect of annealing. In the blends, the PA‐6 crystallizes within the PA‐66 spherulites. When prepared from HCOOH solution at…
We report on measurements of the thermal conductivity of the quasi-one-dimensional conductor (${\mathrm{NbSe}}_{4}$${)}_{10}$${\mathrm{I}}_{3}$ between 80 and 320 K. We show that the thermal conductivity exhibits a well-defined minimum below the Peierls transition temperature ${\mathit{T}}_{\mathit{p}}$=285 K. Such be…
Dynamic pore collapse in porous materials is studied by analyzing the finite deformation of an elastic/viscoplastic spherical shell under impulsive pressure loading. Effects of dynamic loading rate, pore size, initial porosity, strain-rate sensitivity, strain hardening, thermal softening, and mass density of the matri…
Rhombohedral forms of layered boron nitride (r-BN) as mixtures with copper powders were shock compressed and quenched from pressures in the range 8–50 GPa. Recovered specimens were investigated by x-ray diffraction and electron microscopy. The graphite-like BN (h-BN) and turbostratic BN (t-BN) phases are observed in t…
Measurements are reported for the electrical conductivity of different compositions of silicate glasses containing copper and vanadium in the temperature range 200--500 K. The experimental results for the two systems are found to be very similar and are analyzed with respect to theoretical models existing in the liter…