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。
Coercivity mechanism of the precipitation-hardened Sm(Co,Fe,Cu,Zr)z high-temperature magnets was found to vary with temperature by measurements of reversible magnetization. The magnetization reversal is mainly controlled by domain-wall pinning when temperature is lower than 800K, while is mainly dominated by nucleatio…
An increase in carrier mobility from typical values around 100 to more than 300cm2∕Vs at room temperature is detected on hydrogenated undoped ⟨100⟩ diamond layers after annealing at 400 K in a vacuum. As a function of temperature in the range 400 to 125 K the high mobility followed tendencies remarkably close ionized…
A general model relating mechanical and vibrational properties of binary cubic crystals is formulated by the combination of first Szigeti and the Lyddane-Sachs-Teller relations. It is found that a direct correlation is expected to hold between bulk modulus and longitudinal optical phonon frequencies. We apply this mod…
We have investigated the influence of the microstructure and chemistry of the surrounding host on the strong visible photoluminescence (PL) from silicon nanoclusters (nc-Si) embedded in three different silicon-based dielectric compounds: SixNy:H,Cl, SixNyOz:H,Cl, and SixOz:H,Cl, obtained from silicon nitride films dep…
Crystalline Ni nanoparticles in the near surface of TiO2 (rutile) have been synthesized by Ni ion beam implantation at room temperature to a fluence of 1×1017∕cm2. Transmission electron microscopy, optical absorption spectroscopy, and a superconducting quantum interference device magnetometer have been utilized to cha…
We report evidence for phase coexistence of orbital orderings of different symmetry in SmVO3 by high resolution x-ray powder diffraction. The phase coexistence is triggered by an antiferromagnetic ordering of the vanadium spins near 130 K, below an initial orbital ordering near 200 K. The phase coexistence is the resu…
The development of methods to predict the strength and stiffness of biomaterials used in tissue engineering is critical for load-bearing applications in which the essential functional requirements are primarily mechanical. We previously quantified changes in the effective stiffness (E) of needled nonwoven polyglycolic…
The concept of a field-effect transistor with ferroelectric gate has been implemented using the GaN∕AlGaN heterostructure combined with Pb(Zr,Ti)O3 ferroelectric layer. The processing conditions were optimized in a way to obtain textured Pb(Zr,Ti)O3 films without destroying the two-dimensional electron gas (2D gas) si…
Low temperature inelastic neutron scattering studies have been performed to characterize the low energy magnetic excitation spectrum of the magnetic nanomolecule ${{\mathrm{Mo}}_{72}{\mathrm{Fe}}_{30}}$. This unique highly symmetric cluster features spin frustration and is one of the largest discrete magnetic molecule…
$^{139}\mathrm{La}$- and $^{55}\mathrm{Mn}$-NMR spectra demonstrate that the ground state of the $A$-site-ordered perovskite manganite ${\mathrm{LaBaMn}}_{2}{\mathrm{O}}_{6}$ is a spatial mixture of the ferromagnetic and antiferromagnetic regions, which are assigned to the metallic and the insulating charge ordered st…
Lead telluride (PbTe) nanocrystals have been synthesized using a chemical vapor deposition technique. The size-selective precipitation mechanism enables relatively good control of the particle size distribution by variation of the heating temperature, the Ar gas flow rate, and an admixture with Au particles. As the re…
This article describes a simple thermal-decomposition/nitridation method for the large-scale synthesis of 1D alpha-Si(3)N(4) nanostructures, such as millimeter-scale microribbons, nanosaws, nanoribbons, and nanowires. These nanostructures are systematically investigated by checking the product deposited at different a…
Microstructure development was examined for BaBi 4 Ti 4 O 15 prepared by the templated grain growth method, and the origin of texture development was discussed. The microstructure development in a compact composed of a platelike template and equiaxed matrix grains was characterized as follows: (1) the template grains…
Plasmon resonance spectra of supported Ag nanoparticles are studied by depositing the particles on different substrates. It was found that the dielectric properties of the substrates have significant effects on the spectral line shape, except the resonance frequency. Beyond the plasmon resonance band, the spectral sha…
Abstract Hybrid composites based on bisphenol‐C‐formaldehyde resin and jute mat with rice, wheat, sugar cane, and jamun husks have been fabricated at 150°C under 30.4 MPa pressure for 2 h. The resin content in composites was 50% of fibers. Tensile strength, flexural strength, electric strength, and volume resistivity…
The scaling of calcium sulfate was studied by performing laboratory experiments under controlled conditions. The experiments were aimed at measuring the rate of deposition at different positions on a heated surface. The overall thermal resistance was determined from temperatures measured using thermocouples positioned…
Combustion synthesis was used to obtain nanocrystalline Y (2− x − y ) Tm x Yb y O 3 blue‐emitting phosphors. From X‐ray diffraction (XRD) it was determined that the powders in the as‐synthesized state were in a state of high strain. Upon thermal treatment, the strain in the lattice decreased, which resulted in an impr…
The crystal structure of LiNH2 was reinvestigated using powder neutron diffraction with high sensitivity. The compound crystallizes in the tetragonal space group I4¯ with lattice parameters a=b=5.03442(24)Å,c=10.25558(52)Å. It is found that H atoms occupy 8g1(0.2429, 0.1285, 0.1910) and 8g2 (0.3840, 0.3512, 0.1278) si…
Impact toughness is one of the major mechanical properties for structural materials. It is generally observed that in coarse-grained materials the impact toughness decreases with decreasing testing temperature. Here, we report that the impact toughness of nanostructured Ti processed by severe plastic deformation is en…
Abstract Summary: High‐molecular‐weight poly(butylene succinate) (PBS) is prepared by the lipase‐catalyzed polymerization of dimethyl succinate and butane‐1,4‐diol via the formation of cyclic oligomers as a new strategy for the green production of bio‐based plastics. The cyclic oligomer is first produced by the lipase…