Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Two simple techniques using single-crystal specimens in polarized infrared attenuated total reflection (ATR) spectroscopy were developed for structural studies of molecular crystals, in particular of long-chain compounds. The first technique relates to a rotatory change of sample setting around the normal of the sampl…
The complexation of three kinds of sequence-ordered acid (co)polymers with a base homopolymer was studied. The acid polymers used are poly(methacrylic acid) 1, alternating (1:1) ethylene-methacrylic acid copolymer 2, and periodic (2:1) ethylene-methacrylic acid copolymer 3, and the base polymer is poly(4-vinylpyridine…
We have conducted a detailed study of Kr films adsorbed on BN. We have performed adsorption-isotherm measurements and calculations for the potential energy of Kr atoms on the surface of BN. Both the experimental and the theoretical results are extensively compared to data for Kr on graphite, as well as to data for ${\…
Pyroelectrically induced electron emission from different ferroelectric single crystals and ceramics is studied. It is observed that (Pb,La)(Zr,Ti)O3 ceramics generate rather low ferroelectric electron emission (FEE) current compared with single crystals such as triglycine sulphate and lithium niobate. Figures of meri…
In this paper a simple lattice gas model for the catalytic CO+NO→CO2+1/2N2 surface reaction is studied by means of Monte Carlo simulations. In the simulations we take into consideration the diffusion of all particles and the desorption of CO. The square and triangular lattices are used to model the surface of an ideal…
We use the $N$-point Pad\'e approximant to make the analytic continuation of the dynamic response function. This continuation scheme reproduces very efficiently the plasmon energy dispersion and the dynamic scattering cross section with double peaks for Al. For Si with covalent bondings, the energy-loss function exhib…
X-band (9.56 GHz) electron paramagnetic resonance (EPR) measurements were performed on ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Yb}}_{\mathit{x}}$S, ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Yb}}_{\mathit{x}}$Se, and ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm…
The gas phase downstream products of an air glow discharge have been measured, using absorption and emission spectroscopies, as a function of plasma power, air flow rate, and distance from the plasma. In addition, the reaction of these products with a linear low density polyethylene (LLDPE) polymer surface has been fo…
The characteristic mechanical behavior of bulk Ge1−xSix alloys with compositions x=0–0.4 grown by the Czochralski technique is investigated as a function of the composition and temperature by means of compressive deformation and is compared with that of elemental Ge and Si semiconductors. Both the yield stress and the…
The segmental concentration profile ρ of end-tethered flexible polymer chains is calculated for comparison with recent measurements on polymer layers having a low surface grafting density σ. Moments of ρ are also calculated as these quantities, rather than the full concentration profiles, are usually measured experime…
The nucleophilic substitution in poly(vinyl chloride) (PVC) with sodium benzenethiolate has been studied in two kinds of solvent differing in the molecular structure in the vicinity of the carbonyl group. From the evolution of the content of isotactic (mm), heterotactic (mr), and syndiotactic (rr) triads; and of mmmm,…
The recently introduced nuclear Fukui function φα is formally identified as a reactivity index of the density functional theory (according to the postulated criterion of |dμ|) and is shown to constitute the conformational contribution to a change in the molecular electronic chemical potential μ, through the relation d…
We show that at about 340 K a large (≂50%) change in the microwave absorption of a single crystal of La0.7Sr0.3MnO3 is caused by the application of a field of just a few tens of mT. This large magneto-impedance occurs at 10 GHz but is absent at 36 GHz, and we demonstrate that these results follow from the frequency an…
We report silicon band-edge photoluminescence (PL) with photon energy of 1.1 eV and external quantum efficiency (EQE) better than ${10}^{\ensuremath{-}3}$ in samples prepared by high-temperature oxidation of porous silicon. The integrated PL intensity is insensitive to temperature. The EQE strongly depends on the anne…
Local-density-functional-theory (LDFT) calculations within the plane-wave pseudopotential framework are performed for two polar (111) and two nonpolar (100) MgO/Cu interfaces. The polar interfaces have larger works of adhesion than nonpolar ones, consistent with field-ion and electron-microscopy observations of (111)…
Accurate stopping powers of polyimide have been determined for mean energies (E) in the range of 200 keV≤E≤3200 keV for 4He ions and 550 keV≤E≤1550 keV for 1H ions, using the transmission method for foils with areal densities of 30–225 μg/cm2. The overall uncertainties of ∼2% are mainly due to the foil thickness deter…
A lattice instability of carbon nanotubes induced by a magnetic field perpendicular to the tube axis is studied in a k · p scheme. Both in-plane Kekulé and out-of-plane distortions are enhanced drastically with increase of a magnetic field independent of whether a nanotube is metallic or semiconducting and magnetic fl…
The electronic properties of thiophene oligomers (nT, n=2–8) have been investigated in the lowest excited triplet state. Theoretical calculations of the zero field splitting parameters and of the π-electron spin density have been performed and compared with previous experimental EPR results. The calculations are based…
Dimeric cyclotetramethylene carbonate (TeMC)2 was polymerized in bulk at 185°C. Either nBuSnCl3 or Sn(II)2-ethylhexanoate (SnOct2) were used as catalysts. SnOct2 proved to be somewhat less reactive, but high yields (up to 93%) and high viscosities (νinh up to 0.85 dL/g) were obtained with both catalysts. Viscosity-ave…
We consider the Seebeck coefficient in ${\mathrm{LaCrO}}_{3}$ and related transition-metal-oxide perovskites using a model for electronic conduction based on the electronic structure of the 3d orbitals of the B-site transition-metal cations. Relations for the Seebeck coefficient are presented for those perovskite syst…