Materials Literature
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As determined by quantitative differential thermal analysis, the enthalpies of fusion of forsterite and spinel, are ΔH f = 142 ± 14 and 107 ± 11 kJ/mol at 2174 and 2408 K, respectively. Significant premelting has been observed for forsterite, beginning about 100 K below the congruent melting point. When heated in grap…
Abstract A survey by X‐ray diffractometry was carried out to confirm the two crystalline phase Iα/Iβ(triclinic/monoclinic) system of native celluloses. We have investigated cellulose samples from 12 different origins and measured the d ‐spacings with reasonable precision. The samples were then subjected to the hydroth…
Among the mechanisms suggested to account for degradation of varistor materials, ion migration has strong support. Mobile, positively charged ions in the depletion layer would be the key element in degradation. In this context, the authors discuss the consequences of an electrical stressing on the current-temperature…
Abstract We review the theory of the isotropic—nematic phase transition for solutions of thin hard rods and semi-flexible chain molecules along with the extensions to polydisperse systems and soft interactions. The occurrence of more highly ordered liquid crystal phases (smectic, columnar) in concentrated solutions of…
Oxidation of pure titanium was carried out at room temperature under different oxygen pressures (10 -8 -10 -6 torr). The kinetics for each pressure was determined. Measured film thicknesses were larger for higher pressures. Deconvolution of XPS spectra showed than TiO was the major oxide present and TiO 2 the minor co…
A set of hydrogenated amorphous silicon oxide (a-SiOx:H) films have been fabricated by plasma enhanced chemical vapor deposition. Some of the films exhibit strong room-temperature photoluminescence and others do so only after annealing at high temperature. The variation of photoluminescence after different annealing t…
Ordered phases of O on W(110) entail compressive surface stress, the manifestations of which are directly observed for different coverages using scanning tunneling microscopy. Low coverage adsorption results in a gas phase with disordered persistent structures. At higher coverage, ordered phases condense with disorder…
Magnetic polarons in magnetically disordered systems (for brevity, spin-glass polarons) are in one respect very unlike other polarons: Usual polaron hopping at low T proceeds via tunneling, and these polarons do not affect the T dependence of the hopping rate, while the spin-glass polaron tunneling is suppressed by th…
Polystyrene (PS)-polyisoprene (PI) diblock copolymers dissolved in n-decane aggregate into spherical micelles with a PS core and a corona of tethered PI chains. The PI corona may be considered as a brush on the surface of a sphere or as the outer part of a many-armed polymer star. The thermal density fluctuations of t…
The E(V) phase diagram of different crystal structures of indium nitride is studied theoretically, using density functional theory, pseudopotential and full-potential LMTO methods. The high-pressure phase is identified as rocksalt and is found to be semiconducting. The transition pressure is predicted, and the lattice…
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…