Materials Literature
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A decagonal phase which was grown from an icosahedral phase in a rapidly solidified Al 70 Pd 20 Mn 10 alloy by annealing at 800°C was examined by means of high-resolution electron microscopy. From the high-resolution image, we directly determined a two-dimensional arrangement of atom clusters, which are structural uni…
The electron effective mass of the conduction band in direct-band-gap ${\mathrm{GaAs}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{P}}_{\mathit{x}}$ alloys (x0.4) is reevaluated. A direct determination of ${\mathit{m}}^{\mathrm{*}}$ using the optically detected cyclotron resonance technique is presented for the low…
NaB(OH) 4 , M r =101.83, monoclinic, P2 1 /a, a=5.886 (3), b=10.566 6), c=6.146 (3) A, β=111.60 (4) o , V=355.4 (3) A 3 , Z=4, D x =1.903 Mg m -3 , λ(Mo Kα)=0.71069 A, μ=0.27 mm -1 , F(000)=208, room temperature, R=0.030 for 882 observed reflections with I>3σ(I). The structure consists of six-coordinate Na + in caviti…
Abstract The necleation and crystal growth of poly(ether ether ketone) (PEEK) on carbon fiber during isothermal crystallization were studied using optical microscopy. It was shown that the nucleation rate on the fiber is affected by the crystallization and melting temperatures. Transcrystallinity of PEEK was found to…
The structure of the title compound, diaqua{2,7,12,17-tetrakis(1-methyl-4-pyridyl)-21,22,23,24-tetraazapentacyclo[16.2.1.1 3,6 .1 8,11 .1 13,16 ]tetracosa-1(21),2,4,6(22),7,9, 11(23),12,14,16(24),17,19-dodecaene-N 21 ,N 22 ,N 23 ,N 24 }manganese(III) pentachloride heptahydrate, Mn-tmpyp, is the second example of a pla…
The nonlinear optical properties of CdSe quantum dots are investigated using self-saturation and degenerate four-wave mixing techniques. The saturation of the room temperature absorption coefficient, for a wavelength in the vicinity of the first exciton peak, is measured. The measured data can be predicted from a desc…
350-nm-wavelength laser ablation of ceramic SiC targets has been used to deposit SiC films on fused silica and R-cut sapphire at substrate temperatures from 300 to 1150 °C. The films deposited above 800 °C show (111) and (222) x-ray-diffraction bands from crystal planes parallel to the substrate. The bandwidths decrea…
We have found definite evidence which proves that radiation damage in SiO2/Si induced by low-energy electrons is caused by plasmon excitation in SiO2. The SiO2/Si sample was irradiated by accelerated thermoelectrons, and the flat-band voltage shift, ΔVFB, of the sample was measured by the C-V method. The effective cha…
To study the mobility of stretched SPC/E water and its dependence on temperature and density, five molecular dynamics computer simulation runs were performed. Three runs were performed at temperature 300 K and densities 1.0, 0.9, and 0.8 g/cc. Two more runs were performed at temperature 273 K and densities 1.0 and 0.9…
Photon-correlation spectroscopy was performed to observe relaxation modes in an antiferroelectric liquid crystal (R)-MHPOBC. A phase mode in the SmI A * phase, which is the same as one in the incommensurate phase of solid, was observed for the first time. From the dispersion relations of the Goldstone modes in the SmC…
The residual electric dipole interactions recently detected in the deuterium NMR spectra of α,ω-dibromoalkanes dissolved in nematic liquid crystalline solvents [J. Phys. Chem. 96, 8176 (1992)] are analyzed in the context of the modular formulation of flexible molecule ordering. The chord model realization of this form…
Abstract Irradiation of PTFE by accelerated electrons in the presence of air gives rise to a carboxylated structures at doses above 50 kGy. The surface of the irradiated suspension polymerizate TF 1750 is more carboxylated than is the bulk. The influence of oxygen content and radicals is much higher than it is with th…
Nonlinear piezoelectricity has recently been detected in strained-layer superlattices where CdTe is pseudomorphically grown along (111) on different materials. We investigate this problem from first principles using density-functional theory. As a byproduct, we provide the ab initio calculation of several properties o…
Surface core-level-shift photoelectron diffraction has been used to determine the position of oxygen vacancies on rutile ${\mathrm{TiO}}_{2}$(100)1\ifmmode\times\else\texttimes\fi{}3. Ti 3p photoelectrons associated with Ti atoms adjacent to oxygen vacancies were used as the diffraction source. The angle-scanning mode…
The orientational decay of chemically and thermally stable high-temperature chromophores doped into thin films made from polyimides and a variety of other polymeric hosts has been investigated. The chromophores are aligned using electric field poling and second-harmonic generation (SHG) is used to probe the decay of t…
A quasi two-dimensional metal K 3 Cu 8 S 6 has two phase transitions at T 1 (153 K) and at T 2 (55 K), accompanied by an incommensurate (between T 1 and T 2 ) and a commensurate (below T 2 ) superstructures, respectively. On the other hand, the resistivity of Rb 3 Cu 8 S 6 , which is isostructural with K 3 Cu 8 S 6 ,…
The crystal structure of the title compound is built from four kinds of molecule: one 7,7,8,8-tetracyano-p-quinodimethane [TCNQ: 2,2'-(2,5-cyclohexadiene-1,4-diylidene)bispropanedinitrile]; two 2-[4-(cyanoformyl)phenyl]malononitrile ylides {Y - :2-[4-(cyanoformyl)phenyl]propanedinitrile ylide}; one extended 2,2',5,5'-…
The structure and properties of Co-N, Co-Fe-N, and Co-Zr-N films, prepared by rf reactive sputtering using nitrogen and argon gases, have been studied. The resistivity and coercivity of Co-N, Co-Fe-N, and Co-Zr-N films were determined as a function of nitrogen partial pressure. It was found that the properties of Co-N…
Auger electron spectroscopy has been used to measure the diffusion of oxygen away from the surface of single-crystal zirconium (0001). The experimental data have been modeled by an infinitely thin oxygen layer (ITOL) and thicker layers. The ITOL model best describes the diffusion behavior under the experimental condit…
The temperature dependence of the Al 2p line width and binding energy has been studied in the range from 80 K up to and beyond the Al bulk melting point (${\mathit{T}}_{\mathit{m}}$=933.5 K). By comparing the experimental data with results from calculations based on a nearest-neighbor force constant model, we find the…