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 determine the effective dipolar interaction between single domain two-dimensional ferromagnetic particles (islands or dots), taking into account their finite size. The first correction term decays as 1/D^5, where D is the distance between particles. If the particles are arranged in a regular two-dimensional array a…
The mass transfer of interstitial impurities in a crystalline lattice under the influence of the fast-moving deformation disturbance of the type of a shock wave is considered. The velocity of the movement of the disturbance is supposed to be compared with the characteristic velocity of the relaxation of the diffusion…
In this paper we present a study of magnetic order of quantum Heisenberg spins on pyrochlore type lattices: a lattice of corner sharing tetrahedra. We use the Cluster Variation Approximation with the tetrahedron as basic cluster. We find that in case of anti-ferromagnetic nearest--neighbour exchange there is no long--…
For a single crystal of TmGa3, two-dimensional angular correlation of positron annihilation radiation spectra were measured and subjected to a deconvolution algorithm based on the Van Citter iterative method. The three-dimensional electron-positron momentum density was reconstructed both via the Cormack and a modified…
Electron-positron momentum densities in Y, reconstructed from two-dimensional angular correlation of annihilation radiation spectra, are compared with the theoretical predictions of fully-relativistic augmented plane-wave calculations. Knowledge of the theoretical densities and of the effects on them of certain symmet…
A reconstruction technique based on Radon transforms is used to obtain 3D electron momentum density rho(p) using nine recently measured high-resolution Compton profiles (CPs) from a Cu_{0.9}Al_{0.1} disordered alloy single crystal. The method was also applied to nine corresponding theoretical CPs computed within the K…
Abstract Blends of poly( L ‐lactic acid) (PLA) and poly(butylene succinate) (PBS) were prepared with various compositions by a melt‐mixing method and the phase behavior, miscibility, and morphology were investigated using differential scanning calorimetry, wide‐angle X‐ray diffraction, small‐angle X‐ray scattering tec…
We present Compton-scattering studies on the high-momentum components of the valence electron momentum density in beryllium. The experiments were performed with incident photon energies of 29 and 56 keV with a momentum space resolution of 0.10 and 0.16 a.u. units of momentum, respectively. The temperature dependence o…
INO has been active in microbolometer and FPA technology development since the early 1990s. Microbolometer detectors based on VO<SUB>2</SUB> films with TCR above 3% are typically fabricated. VO<SUB></SUB>x films with TCR above 2% have been developed for applications where FPA temperature is not stabilized. INO is cont…
We present a Raman scattering study of the ${\mathrm{La}}_{(2\ensuremath{-}x)/3}{\mathrm{Li}}_{x}{\mathrm{TiO}}_{3}$ $(0.1<~x<0.5)$ family of ionic conductors as a function of temperature, lithium content, thermal treatments, and isotope substitution, with the aim of elucidating the lithium location and dynamics…
We report on the sol–gel deposition and characterization of high-quality, epitaxial films of PbZr.52Ti.48O3 (PZT) on (001)Si substrates, with a thickness range of 400 Å to 1 μm. The epitaxial growth of PZT on (001)Si is achieved using a thin template layer of SrTiO3, grown by molecular-beam epitaxy. The sol–gel PZT fi…
We present a method to establish a correlation between the crystalline structure and the fluorescence properties of isolated semiconductor nanocrystals. By using ultrathin silicon nitride substrates with markers, we have localized and investigated the same particles in both a high-resolution transmission electron micr…
Carbon nitride films were grown on silicon and hard disk substrates using pulsed dc magnetron sputtering in a single-cathode deposition system. Substrates were mounted on a specially designed holder that allowed 45° tilt angle and substrate rotation about the surface normal up to 20 rpm. The influence of substrate bia…
Temperature-dependent dc conductivity measurements and infrared reflectivity measurements (20--9000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) were performed on a series of polyaniline samples with two different dopant acids at various doping levels. The typical fingerprints of a disordered metal such as a positive t…
We report evidence of antiferromagnetic (AF) transition in ${\mathrm{Fe}}_{19}metheidi,$ a molecular nanomagnet with a total spin $S=33/2.$ The temperature (T) dependence of the specific heat (C) shows a \ensuremath{\lambda} anomaly at 1.19 K and at the same temperature an anomaly is also observed in the low-field $(B…
The synthesis and structural characterization of a manganese adduct of N-confused tetraphenylporphyrin (NCTPP) is presented; in the absence of coordinating ligands this complex forms a novel dimer structure and demonstrates a potential manganese agostic interaction with the interior pyrrolic CH as seen in other first…
Polarized microscope observation of ferroelastic domains in a SrBi2Ta2O9 (SBT) single crystal reveals the presence of domains up to Tc1≃770 K, which supports the ferroelasticity and Amam symmetry of the intermediate phase between ferroelectric and paraelectric phases. Far-infrared spectra of SBT ceramics, single cryst…
Multi-colored photochromic single crystals of diarylethene mixtures composed of two compounds have been prepared. Upon irradiation with different wavelengths of light, the colorless crystals turn red, blue, or purple (see Figure), as the two components selectively undergo photochromic reactions. Such multi-colored pho…
BAE SYSTEMS has designed and developed MicroIR microbolometer focal plane arrays (FPAs) in three formats (160x120, 320x240, and 640x480) and with two different pixel sizes (46micrometers and 28micrometers ). In addition to successfully demonstrating these FPA technologies, BAE SYSTEMS has produced and delivered thousa…
The low-temperature magnetoresistance induced by an axial magnetic field in individual single-walled carbon nanotubes (SWNTs) is studied numerically based on Boltzmann transport equation and \ensuremath{\pi} electronic energy dispersion relations for individual SWNTs as well as taking one-dimensional weak localization…