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。
We construct multi-field generalisations of the Cosserat continuum model on the basis of the square lattice model that takes into account rotational degree of freedom of microstructural elements. This approach allows us to model not only long but also short wavelength fields of displacements and rotations. The accurac…
We found a new cobalt oxide (CaOH)1.14CoO2 by utilizing the high-pressure technique. X-ray and electron diffraction studies revealed that the compound has layer structure which consists of CdI2-type CoO2 layers and rock-salt-type double CaOH atomic layers. The two subcells have incommensurate periodicity along the a-a…
Abstract The equations needed to correctly interpret both AC and DC conductivity results of single wall carbon nanotube (SWNT) polymer composites and the scaling of these results onto a single master curve are presented. Brief discussions on the factors that determine the critical volume fraction (ϕ c ) and the percol…
Polarized Raman scattering study of (001)-oriented epitaxial ${\mathrm{BiFeO}}_{3}$ $(\mathrm{BFO})$ thin films with pseudo-tetragonal symmetry (4mm) was carried out by employing two distinct backscattering geometries. The ${A}_{1}$-symmetry transverse-optical $[{A}_{1}(\mathrm{TO})]$ phonons were isolated from the $E…
Using laser tweezers, we study colloidal interactions of solid microspheres in the nematic bulk caused by elastic distortions around the particles with tangential surface anchoring. The interactions overcome the Brownian motion when the interparticle separation ${\stackrel{\ensuremath{\rightarrow}}{\mathbf{r}}}_{p}$ i…
Using an extension of a first-principles method developed by King-Smith and Vanderbilt [Phys. Rev. B, 49, 5828 (1994)], we investigate the effects of in-plane epitaxial strain on the ground-state structure and polarization of eight perovskite oxides: $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$, $\mathrm{Sr}\mathrm{Ti}{\m…
Reproducible Sb-doped p-type ZnO films were grown on n-Si (100) by electron-cyclotron-resonance-assisted molecular-beam epitaxy. The existence of Sb in ZnO:Sb films was confirmed by low-temperature photoluminescence measurements. An acceptor-bound exciton (A°X) emission was observed at 3.358 eV at 8 K. The acceptor en…
We present an experimental system suitable for producing spherical crystals and for observing the distribution of lattice defects (disclinations and dislocations) on a significant fraction (50%) of the sphere. The introduction of fluorescently labeled particles enables us to determine the location and orientation of g…
We consider a disordered two-dimensional electron gas with spin-orbit coupling placed in a perpendicular magnetic field and calculate the magnitude and direction of the electric-field-induced spin polarization. We find that in strong magnetic fields the polarization becomes an oscillatory function of the magnetic fiel…
A Phenomenological Mesoscopic Field Dislocation Mechanics (PMFDM) model is developed, extending continuum plasticity theory for studying initial-boundary value problems of small-scale plasticity. PMFDM results from an elementary space-time averaging of the equations of Field Dislocation Mechanics (FDM), followed by a…
Even if Moore's Law continues to hold, it will take about 250 years to fill the performance gap between present-day computer and the ultimate computer determined from the laws of physics alone. Information processing technology in the post-CMOS era will likely consist of a heterogeneous set of novel device technologie…
We present the formulation for finding the distribution of eigenstrains, i.e. the sources of residual stress, from a set of measurements of residual elastic strain (e.g. by diffraction), or residual stress, or stress redistribution, or distortion. The variational formulation employed seeks to achieve the best agreemen…
Abstract A thermodynamic analysis of grain boundary adsorption is presented. From the thermodynamic model developed it follows that in binary polycrystals with identical grain boundaries at some conditions three phases can coexist in equilibrium below the solidus temperature. The model predicts that two solid solution…
Abstract The thermodynamic conditions for spontaneous grain boundary wetting and stress driven liquid metal embrittlement are related to each other and the kinetic mechanism responsible for fast GB penetration under small stress is described. The dissolution – condensation mechanism of liquid metal embrittlement and l…
The effect of illumination on the dielectric properties of lead molybdate (PbMoO 4 ) single crystals was studied. Illumination with intrinsic light gives rise to a substantial enhancement of low-frequency permittivity (the photodielectric effect, PDE). The PDE is dependent on temperature and reaches a maximum near 400…
Freestanding nanocrystalline films of silicon carbide (see Figure) can be synthesized employing a simple route—spray pyrolysis of ball-milled silicon. The silicon–hexane slurry was spray pyrolized in a silica tube at a constant temperature of 1000–1100 °C. XRD and SEM studies show the as synthesized films to be nanocr…
A compact model for description of the ferroelectric hysteresis loop behavior based on the dipole switching theory was derived. A cell of ferroelectric crystal is just as an equivalent dipole, so the hysteresis loop characteristic of ferroelecticity is the polarization characteristic of dipole in the electric field. T…
Japanese activities on fusion structural materials RD reduced activation martensitic/ferritic steels (RAFs) as reference material and vanadium alloys and SiC/SiC composite materials as advanced materials. The R&D histories of these candidate materials and the present status in Japan are reviewed with the emphasis on m…
The structural and the magnetic properties of polycrystalline La/sub 1-x/Sr/sub x/CoO/sub 3/ (LSCO) have been studied experimentally. The single LSCO phase in all the prepared samples were confirmed by the X-ray diffraction and X-ray photoelectron spectroscopy measurements. From the temperature dependence of inverse m…
Nanometer size ferroelectric domains, having a width as small as one unit cell, are observed in ultra-thin BaTiO 3 films (2–10 nm thick) using high resolution TEM. Only 180° domains and 90° domain boundaries are formed in nano-multi-domains structures. Most of the domains are oriented in-parallel to the film plane. Th…