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。
The high-pressure phase transitions of silicon and gallium nitride: a comparative study of Hartree - Fock and density functional calculations , Ravindra Pandey, Mauro Causa', Nicholas M Harrison, Max Seel
Band-edge related photoluminescence from a strained Si0.96Sn0.04 alloy grown by molecular beam epitaxy on Si(100) substrate has been seen for the first time. We report band-edge related photoluminescence from a compressively strained pseudomorphic Si0.96Sn0.04 alloy. The luminescence observed consisted of two dominant…
Coherent precipitates of vanadium dioxide have been formed in the near-surface region of sapphire by the stoichiometric coimplantation of vanadium and oxygen combined with subsequent thermal processing at temperatures ranging from 700 to 1000 °C. The embedded VO2 precipitates, which are three-dimensionally oriented wi…
The application of the magneto-circular x-ray absorption dichroism (MCXD) spin sum rule for 3d transition metal compounds faces two problems: the unknown value of the magnetic dipole operator and the division between the and edges. A systematic study of the order of magnitude of the -operator for ions is presented. Th…
We have investigated the electronic structure associated with the ferromagnetic transition of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Pb}}_{x}{\mathrm{MnO}}_{3}$ using high resolution photoemission, Mn 2p resonant photoemission, and O 1s x-ray…
A method is described for calculating the motion of N spherical particles suspended in a quiescent second-order fluid. The method requires calculation of only the low-Reynolds-number Newtonian velocity profile. This profile is used in conjunction with what has been called the ‘Reciprocal theorem method’ to evaluate pa…
The flow of two-dimensional deformable drops through branching (bifurcating) tubes is studied numerically using a boundary integral formulation. The undeformed drop diameter is assumed to be less than the tube diameter. Capillary numbers between 10 −2 and 1 are considered. Flow in the branching tube is characterized b…
Thermal behavior of different cellolusic fabrics was investigated in air and nitrogen by TG, DTG and DTA. Kinetic parameters based on weight loss for the initial and major stages of thermal degradation were determined. The weight loss in the TG curve for the cellulosic fabrics can be divided into four stages. In gener…
The novel polytheretherketone (PEK-C) prepared from phenolphthalein in our institute is an amorphous, rigid, tough material with good mechanical properties over a wide temperature range. To improve its water vapor permeability for the application of gas drying, PEK-C was sulfonated with concentrated sulfuric acid and…
In this book the theories, techniques and applications of reflection electron microscopy (REM), reflection high-energy electron diffraction (RHEED) and reflection electron energy-loss spectroscopy (REELS) are comprehensively reviewed for the first time. The book is divided into three parts: diffraction, imaging and sp…
The elastic constants of ice VI have been determined at −2 °C and 7.2 kbar by single crystal Brillouin spectroscopy. The adiabatic elastic moduli were found to be C11=26.8, C12=14.5, C13=12.8, C33=26.2, C44=6.3, and C66=10.4×104 bar, within approximately 1.5%. Large (125 mm3) single crystals were grown in a high press…
First hyperpolarizabilities (β) of two tricyanovinylthiophene nonlinear optical chromophores were determined using second harmonic, hyper-Rayleigh, scattering. The use of an external standard in the determinations is compared with the previous use of an internal standard. The first hyperpolarizability of the well-know…
Scatterometry, the characterization of periodic structures via diffracted light analysis, has been shown to be a versatile technique for measuring critical dimensions in photoresist as small as 0.160 micrometer. Rapid, non-destructive and inexpensive, scatterometry has the potential to be applied to other microlithogr…
The near-edge absorption fine structure of carbon in graphite has been calculated using the multiple-scattering approach. The effects of both a neutral carbon absorber and taking into account the effect of the core hole by using a nitrogen (Z + 1) absorber atom are considered. The best agreement with experiment was ob…
Sehr stark reduzierend wirkt der vierkernige Kupferkomplex 1 im elektronisch angeregten Zustand. Er enthält ein Acetylid‐Dianion, das an die Kupferatome sowohl η 1 als auch η 2 koordiniert, und zeigt langanhaltende Lumineszenz. Seine Gerüststruktur ist rechts wiedergegeben. [Cu 4 (μ‐Ph 2 P‐CH 2 ‐PPh 2 ) 4 (μ 4 ‐η 1 ,η…
The specific heat capacities of (Co, Ni, Fe)–Pd alloys were determined in the crystalline and metastable undercooled liquid state using differential heat flow calorimetry. Applying the melt fluxing technique, the liquid alloys were undercooled by more than 330 K below their respective liquidus temperatures. For Co100−…
The reorientation process of a molecular probe dissolved in the fragile glass former o-terphenyl is studied via electron spin-resonance spectroscopy. Owing to the good resolution of the ESR lineshape in the so-called slow-motion regime, we are able to discriminate between diffusive and jump rotations. In the region of…
When containerless electromagnetic levitation processing was applied to elemental semiconductor Si using a two-step heating method proposed by the present authors, a substantial degree of undercooling up to 420 K (0.25 T m , T m is the melting temperature, 1685 K for Si) has been reproducibly achieved in slowly cooled…
For the first time switchable ferroelectric Langmuir-Blodgett films are prepared and investigated. The films with a regular multilayered structure are prepared from the ferroelectric copolymer of vinylidene fluoride with trifluoroethylene P(VDF-TrFE). The films with the thickness of 150 Å show a phase transition of th…
Results of optical absorption, photoluminescence, fluorescence lifetime and fluorescence-line-narrowing studies on several -doped crystals with the gallogermanate crystal structure are presented. Such crystals are unusual in that most fluoresce via both the broad-band transition and the sharper transition (R line), bo…