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。
A time-resolved x-ray diffraction (XRD) experiment at 250Hz using a synchrotron radiation source was carried out during the containerless solidification of ReFeO3 (Re=Y and Lu) in order to identify the metastable phase in situ. The metastable phase solidified primarily from the undercooled YFeO3 melt finally transform…
The authors demonstrated that it is possible to construct a reflection high-energy electron diffraction (RHEED) pole figure of a polycrystalline film by recording multiple RHEED patterns as they rotate the substrate around the surface normal. Since electrons have limited penetration depth, the pole figure constructed…
It was found in ZnO nanoparticles of nearly uniform size that the Raman frequencies of both the polar A1(LO) and nonpolar E2(H) modes do not shift with particle sizes. This observation is in perfect agreement with previous theoretical prediction. The observed result is consistent with the prediction that the size inse…
We have identified by first-principles computations two dynamically stable structures that are candidate ultrahigh pressure polymorphs of $\mathrm{AB}{X}_{3}$-type compounds. To our knowledge, they have not been experimentally observed yet. They are produced by metastable pressure-induced transformations in $Cmcm$ $\m…
Excitonic luminescence in ZnO exhibits subnanosecond lifetimes combined with high efficiency, which makes epitaxial ZnO a promising ultrafast scintillator material for envisaged imaging applications with high data rate. ZnO thin films on sapphire show external ultraviolet electron-photon conversion efficiencies up to…
Abstract Isomeric linear and rectangular trinuclear metal‐free andzinc(II) phthalocyanine complexes connected by common annulated benzene rings have been synthesized by the mixed cyclotetramerization of a 1,2,4,5‐tetracyanobenzene derivative and 4,5‐bis(2,6‐dimethylphenoxy)phthalonitrile. Their electronic‐absorption a…
Five compacted samples of thermoelectric Zn4Sb3 have been prepared from the same synthesis batch by spark plasma sintering. Four samples were made from powder with a grain size <45μm, and one sample from powder with grain size >45μm. Thermoelectric properties were evaluated, and an apparent strong correl…
At present, synthetic biodegradable polymers commonly used for scaffolds in tissue engineering have a limited range of mechanical properties. This limitation is a challenge to in vivo tissue engineering, as the cell-scaffold construct is expected to maintain or restore normal tissue biomechanics during new tissue form…
The authors have investigated the effect of stress on the room-temperature magnetism of a 10nm thick Heusler-alloy film NiMnSb grown epitaxially on InP. Tensile stress, which the authors applied externally along the easy axis using a piezostack, is shown to reduce the coercivity and the anisotropy coefficient. Using b…
The issue of Schottky barrier formation at carbon nanotube (CNT) contacts with metal leads is of crucial importance for nanotube-based electronic devices. The authors examine the electronic properties of a particular structure containing a metal/CNT contact that resembles experimental setups for CNT field-effect trans…
Density-functional-theory calculations were performed for the unrelaxed $+2$ Si vacancy and $+2$ self-interstitial utilizing periodic boundary conditions and two different methods---the uniform background charge method and the local moment counter charge method---for circumventing the divergence of the Coulomb potenti…
A fluorescent diarylethene derivative that links to a perylene bisimide unit is synthesized and its photochromic and fluorescence properties are studied. Aggregate formation was controlled by the photochromic reaction of the diarylethene unit, and aggregate formation induced a fluorescence wavelength shift between gre…
Abstract This paper reports the synthesis, characterization, and dehydration kinetics of a rare earth hydroxide, Gd(OH) 3 . Uniform rod‐like Gd(OH) 3 powder was prepared by a colloidal hydrothermal method. The powder thus obtained dehydrated into its oxide form in a two‐step process, where crystalline GdOOH was obtain…
The authors have investigated the leakage current mechanism and polarization properties of Bi2WO6 single crystals along the a axis at 25°C. High-pressure oxygen annealing led to a decrease in leakage current, showing that electron is a detrimental carrier of the leakage current property. It is demonstrated that 2mol%…
The strong coupling phase diagram of the spinless fermions on the anisotropic triangular lattice at half-filling is presented. The geometry of inter-site Coulomb interactions rules the phase diagram. Unconventional charge ordered phases are detected which are the recently reported pinball liquid and the striped chains…
Multisegmented one-dimensional hybrid structures of carbon nanotubes and metal nanowires were fabricated using the alumina templates. Metal nanowires are first grown inside part of the nanochannel using electrodeposition technique, which is followed by the growth of carbon nanotubes using chemical vapor deposition. We…
The authors have fabricated a field-effect transistor (FET) based on a rutile TiO2 active channel. Top-gate transistor structure with an amorphous LaAlO3 insulator was fabricated on the ultrasmoothed rutile single crystals. Reproducible n-type FET actions were observed only by the use of ultrasmoothed TiO2 surfaces. M…
Chiral propeller architectures (see figure and inside cover) are constructed from achiral molecules via hydrogen bonding self-assembly in addition to Frank–Pryce spherulitic droplet and fingerprint textures. It is found, for the first time, that neither molecular chirality nor a molecular bend is necessary to form a c…
The growth mechanism of pentacene film formation on $\mathrm{Si}{\mathrm{O}}_{2}$ substrate was investigated with a combination of atomic force microscopy measurements and numerical modeling. In addition to the diffusion-limited aggregation (DLA) that has already been shown to govern the growth of the ordered pentacen…
Ge 2 Sb 2 Te 5 (GST) film in the crystalline state was nitrogen doped using the reactive sputtering method in order to increase sheet resistance. High-resolution x-ray absorption spectroscopy revealed that molecular nitrogen (N2) existed in the N-doped GST film. This finding implies that both molecular nitrogen and at…