Materials Literature
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Interchromophore interactions in flexible multidipolar structures for nonlinear optics were addressed by a combined experimental and theoretical study on two series of one-, two-, and three-chromophore systems in which identical push-pull chromophores are assembled through covalent and flexible linkers in close proxim…
The longitudinal ultrasonic velocity (Vl), magnetization, specific heat, and resistivity of polycrystalline La1∕3Sr2∕3FeO3 have been measured between 20 and 300 K. The material undergoes charge-ordering (CO) transition at about 200 K accompanied by an antiferromagnetic ordering. Upon cooling down from 300 K, a substan…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
Up to date, little work has been done to explore the possible application of the high-temperature 6H-hexagonal BaTiO3 polymorph (h-BaTiO3). In this letter, the feasibility for use of h-BaTiO3 ceramics as microwave dielectric resonators was evaluated through the Mn substitution in B sites. Based on the overall performa…
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…